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  • Energy Research

  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Yean‐Uk Kim; Heidi Webber; Samuel G.K. Adiku; Rogério de Souza Nóia Júnior; +3 Authors

    Comme l'intensité et la fréquence des phénomènes météorologiques extrêmes devraient augmenter sous l'effet du changement climatique, il est de plus en plus essentiel d'évaluer leur impact sur les systèmes de culture et d'explorer les options d'adaptation possibles. Les modèles de culture basés sur les processus (PBCM), qui sont largement utilisés dans les évaluations d'impact du changement climatique, ont amélioré la simulation des impacts des événements météorologiques extrêmes majeurs tels que les vagues de chaleur et les sécheresses, mais ne parviennent toujours pas à reproduire de faibles rendements agricoles dans des conditions humides. Ici, nous donnons un aperçu des mécanismes de perte de rendement des précipitations excessives dans les céréales (c'est-à-dire l'engorgement, la submersion, l'hébergement, les ravageurs et les maladies) et des approches de modélisation associées dans le but de guider les améliorations de la PBCM. Certains PBCM simulent des environnements d'engorgement et d'étang, mais peu capturent les contraintes d'aération sur la croissance des cultures. L'hébergement est souvent négligé par les PBCM ; cependant, certains modèles d'hébergement mécanistes autonomes existent, qui peuvent potentiellement être incorporés dans les PBCM. Certains cadres relient les modèles d'épidémie et de culture basés sur les processus à la prise en compte de différents mécanismes de dommages. Cependant, le manque de données pour calibrer et évaluer ces fonctions de modèle limite l'utilisation de tels cadres. Afin de générer des données pour l'amélioration du modèle et combler les lacunes dans les connaissances, des expériences ciblées sur les mécanismes de dommages de l'engorgement, de la submersion, des ravageurs et des maladies sont nécessaires. Cependant, la prise en compte de tous les mécanismes de dommage dans le PBCM peut entraîner des modèles excessivement complexes avec un grand nombre de paramètres, augmentant l'incertitude du modèle. Des cadres modulaires pourraient aider à sélectionner les mécanismes nécessaires et conduire à des structures de modèle et à une complexité appropriées qui correspondent à une question de recherche spécifique. Enfin, il existe des synergies potentielles entre les PBCM, les modèles statistiques et les données de télédétection qui pourraient améliorer l'exactitude des prédictions et la compréhension des lacunes actuelles des PBCM. A medida que se proyecta que la intensidad y la frecuencia de los fenómenos meteorológicos extremos aumentarán bajo el cambio climático, evaluar su impacto en los sistemas de cultivo y explorar opciones de adaptación factibles es cada vez más crítico. Los modelos de cultivos basados en procesos (PBCM), que se utilizan ampliamente en las evaluaciones de impacto del cambio climático, han mejorado en la simulación de los impactos de los principales fenómenos meteorológicos extremos, como las olas de calor y las sequías, pero aún no logran reproducir los bajos rendimientos de los cultivos en condiciones húmedas. Aquí, proporcionamos una descripción general de los mecanismos de pérdida de rendimiento de la lluvia excesiva en los cereales (es decir, anegamiento, inmersión, alojamiento, plagas y enfermedades) y los enfoques de modelado asociados con el objetivo de guiar las mejoras de PBCM. Algunos PBCM simulan ambientes de anegamiento y estanque, pero pocos capturan las tensiones de aireación en el crecimiento de los cultivos. Los PBCM a menudo descuidan el alojamiento; sin embargo, existen algunos modelos de alojamiento mecanicistas independientes, que potencialmente pueden incorporarse a los PBCM. Algunos marcos vinculan los modelos de epidemias y cultivos basados en procesos con la consideración de diferentes mecanismos de daño. Sin embargo, la falta de datos para calibrar y evaluar estas funciones del modelo limita el uso de dichos marcos. Con el fin de generar datos para la mejora del modelo y cerrar las brechas de conocimiento, se requieren experimentos específicos sobre los mecanismos de daño de anegamiento, inmersión, plagas y enfermedades. Sin embargo, la consideración de todos los mecanismos de daño en PBCM puede resultar en modelos excesivamente complejos con una gran cantidad de parámetros, lo que aumenta la incertidumbre del modelo. Los marcos modulares podrían ayudar a seleccionar los mecanismos necesarios y conducir a estructuras modelo y complejidad apropiadas que se ajusten a una pregunta de investigación específica. Por último, existen posibles sinergias entre los PBCM, los modelos estadísticos y los datos de teledetección que podrían mejorar la precisión de la predicción y la comprensión de las deficiencias actuales de los PBCM. As the intensity and frequency of extreme weather events are projected to increase under climate change, assessing their impact on cropping systems and exploring feasible adaptation options is increasingly critical. Process-based crop models (PBCMs), which are widely used in climate change impact assessments, have improved in simulating the impacts of major extreme weather events such as heatwaves and droughts but still fail to reproduce low crop yields under wet conditions. Here, we provide an overview of yield-loss mechanisms of excessive rainfall in cereals (i.e., waterlogging, submergence, lodging, pests and diseases) and associated modelling approaches with the aim of guiding PBCM improvements. Some PBCMs simulate waterlogging and ponding environments, but few capture aeration stresses on crop growth. Lodging is often neglected by PBCMs; however, some stand-alone mechanistic lodging models exist, which can potentially be incorporated into PBCMs. Some frameworks link process-based epidemic and crop models with consideration of different damage mechanisms. However, the lack of data to calibrate and evaluate these model functions limit the use of such frameworks. In order to generate data for model improvement and close knowledge gaps, targeted experiments on damage mechanisms of waterlogging, submergence, pests and diseases are required. However, consideration of all damage mechanisms in PBCM may result in excessively complex models with a large number of parameters, increasing model uncertainty. Modular frameworks could assist in selecting necessary mechanisms and lead to appropriate model structures and complexity that fit a specific research question. Lastly, there are potential synergies between PBCMs, statistical models, and remotely sensed data that could improve the prediction accuracy and understanding of current PBCMs' shortcomings. نظرًا لأنه من المتوقع أن تزداد شدة وتواتر الظواهر الجوية القاسية في ظل تغير المناخ، فإن تقييم تأثيرها على أنظمة المحاصيل واستكشاف خيارات التكيف الممكنة أمر بالغ الأهمية بشكل متزايد. تحسنت نماذج المحاصيل القائمة على العمليات (PBCMs)، والتي تستخدم على نطاق واسع في تقييمات تأثير تغير المناخ، في محاكاة آثار الظواهر الجوية القاسية الرئيسية مثل موجات الحر والجفاف ولكنها لا تزال تفشل في إعادة إنتاج غلة محاصيل منخفضة في ظل الظروف الرطبة. هنا، نقدم لمحة عامة عن آليات فقدان الغلة للأمطار المفرطة في الحبوب (أي التشبع بالمياه، والغمر، والسكن، والآفات والأمراض) ونهج النمذجة المرتبطة بها بهدف توجيه تحسينات PBCM. تحاكي بعض PBCMs بيئات التشبع بالمياه والبرك، لكن القليل منها يلتقط ضغوط التهوية على نمو المحاصيل. غالبًا ما يتم إهمال السكن من قبل PBCMs ؛ ومع ذلك، توجد بعض نماذج السكن الميكانيكية المستقلة، والتي يمكن دمجها في PBCMs. تربط بعض الأطر نماذج الأوبئة والمحاصيل القائمة على العمليات مع مراعاة آليات الضرر المختلفة. ومع ذلك، فإن نقص البيانات لمعايرة وتقييم هذه الوظائف النموذجية يحد من استخدام هذه الأطر. من أجل توليد بيانات لتحسين النموذج وسد الفجوات المعرفية، يلزم إجراء تجارب مستهدفة على آليات الأضرار الناجمة عن التشبع بالمياه والغمر والآفات والأمراض. ومع ذلك، قد يؤدي النظر في جميع آليات الضرر في PBCM إلى نماذج معقدة للغاية مع عدد كبير من المعلمات، مما يزيد من عدم اليقين في النموذج. يمكن أن تساعد الأطر المعيارية في اختيار الآليات اللازمة وتؤدي إلى هياكل نموذجية مناسبة وتعقيد يناسب سؤالًا بحثيًا محددًا. أخيرًا، هناك أوجه تآزر محتملة بين PBCMs والنماذج الإحصائية والبيانات المستشعرة عن بُعد والتي يمكن أن تحسن دقة التنبؤ وفهم أوجه القصور الحالية في PBCMs.

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    Agricultural and Forest Meteorology
    Article . 2024 . Peer-reviewed
    License: CC BY
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    https://dx.doi.org/10.60692/5k...
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      Agricultural and Forest Meteorology
      Article . 2024 . Peer-reviewed
      License: CC BY
      Data sources: Crossref
      https://dx.doi.org/10.60692/5k...
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      https://dx.doi.org/10.60692/2c...
      Other literature type . 2024
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    Authors: Tommaso Stella; Heidi Webber; Ehsan Eyshi Rezaei; Senthold Asseng; +15 Authors

    Abstract Increasing genetic wheat yield potential is considered by many as critical to increasing global wheat yields and production, baring major changes in consumption patterns. Climate change challenges breeding by making target environments less predictable, altering regional productivity and potentially increasing yield variability. Here we used a crop simulation model solution in the SIMPLACE framework to explore yield sensitivity to select trait characteristics (radiation use efficiency [RUE], fruiting efficiency and light extinction coefficient) across 34 locations representing the world’s wheat-producing environments, determining their relationship to increasing yields, yield variability and cultivar performance. The magnitude of the yield increase was trait-dependent and differed between irrigated and rainfed environments. RUE had the most prominent marginal effect on yield, which increased by about 45 % and 33 % in irrigated and rainfed sites, respectively, between the minimum and maximum value of the trait. Altered values of light extinction coefficient had the least effect on yield levels. Higher yields from improved traits were generally associated with increased inter-annual yield variability (measured by standard deviation), but the relative yield variability (as coefficient of variation) remained largely unchanged between base and improved genotypes. This was true under both current and future climate scenarios. In this context, our study suggests higher wheat yields from these traits would not increase climate risk for farmers and the adoption of cultivars with these traits would not be associated with increased yield variability.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ in silico Plantsarrow_drop_down
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    in silico Plants
    Article . 2023 . Peer-reviewed
    License: CC BY
    Data sources: Crossref
    https://dx.doi.org/10.60692/3z...
    Other literature type . 2023
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    https://dx.doi.org/10.60692/75...
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ in silico Plantsarrow_drop_down
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      in silico Plants
      Article . 2023 . Peer-reviewed
      License: CC BY
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      https://dx.doi.org/10.60692/3z...
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      https://dx.doi.org/10.60692/75...
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Gatien N. Falconnier; Marc Corbeels; Kenneth J. Boote; François Affholder; +52 Authors

    AbstractSmallholder farmers in sub‐Saharan Africa (SSA) currently grow rainfed maize with limited inputs including fertilizer. Climate change may exacerbate current production constraints. Crop models can help quantify the potential impact of climate change on maize yields, but a comprehensive multimodel assessment of simulation accuracy and uncertainty in these low‐input systems is currently lacking. We evaluated the impact of varying [CO2], temperature and rainfall conditions on maize yield, for different nitrogen (N) inputs (0, 80, 160 kg N/ha) for five environments in SSA, including cool subhumid Ethiopia, cool semi‐arid Rwanda, hot subhumid Ghana and hot semi‐arid Mali and Benin using an ensemble of 25 maize models. Models were calibrated with measured grain yield, plant biomass, plant N, leaf area index, harvest index and in‐season soil water content from 2‐year experiments in each country to assess their ability to simulate observed yield. Simulated responses to climate change factors were explored and compared between models. Calibrated models reproduced measured grain yield variations well with average relative root mean square error of 26%, although uncertainty in model prediction was substantial (CV = 28%). Model ensembles gave greater accuracy than any model taken at random. Nitrogen fertilization controlled the response to variations in [CO2], temperature and rainfall. Without N fertilizer input, maize (a) benefited less from an increase in atmospheric [CO2]; (b) was less affected by higher temperature or decreasing rainfall; and (c) was more affected by increased rainfall because N leaching was more critical. The model intercomparison revealed that simulation of daily soil N supply and N leaching plays a crucial role in simulating climate change impacts for low‐input systems. Climate change and N input interactions have strong implications for the design of robust adaptation approaches across SSA, because the impact of climate change in low input systems will be modified if farmers intensify maize production with balanced nutrient management.

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    Agritrop
    Article . 2020
    Data sources: Agritrop
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    Global Change Biology
    Article . 2020 . Peer-reviewed
    License: Wiley Online Library User Agreement
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    Authors: Dueri, Sibylle; Brown, Hamish; Asseng, Senthold; Ewert, Frank; +50 Authors

    Abstract Crop multi-model ensembles (MME) have proven to be effective in increasing the accuracy of simulations in modelling experiments. However, the ability of MME to capture crop responses to changes in sowing dates and densities has not yet been investigated. These management interventions are some of the main levers for adapting cropping systems to climate change. Here, we explore the performance of a MME of 29 wheat crop models to predict the effect of changing sowing dates and rates on yield and yield components, on two sites located in a high-yielding environment in New Zealand. The experiment was conducted for 6 years and provided 50 combinations of sowing date, sowing density and growing season. We show that the MME simulates seasonal growth of wheat well under standard sowing conditions, but fails under early sowing and high sowing rates. The comparison between observed and simulated in-season fraction of intercepted photosynthetically active radiation (FIPAR) for early sown wheat shows that the MME does not capture the decrease of crop above ground biomass during winter months due to senescence. Models need to better account for tiller competition for light, nutrients, and water during vegetative growth, and early tiller senescence and tiller mortality, which are exacerbated by early sowing, high sowing densities, and warmer winter temperatures.

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    Journal of Experimental Botany
    Article . 2022 . Peer-reviewed
    License: CC BY
    Data sources: Crossref
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    Wageningen Staff Publications
    Article . 2022
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    https://dx.doi.org/10.60692/3f...
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    Digital.CSIC
    Article . 2022 . Peer-reviewed
    Data sources: Digital.CSIC
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      Journal of Experimental Botany
      Article . 2022 . Peer-reviewed
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    Authors: INRA, URP3F, France ( host institution ); Durand, Jean-Louis ( author ); Delusca, Kenel ( author ); Boote, Ken ( UF author ); +34 Authors

    This study assesses the ability of 21 crop models to capture the impact of elevated CO2 concentration ([CO2]) on maize yield and water use as measured in a 2-year Free Air Carbon dioxide Enrichment experiment conducted at the Thunen Institute in Braunschweig, Germany (Manderscheid et al., 2014). Data for ambient [CO2] and irrigated treatments were provided to the 21 models for calibrating plant traits, including weather, soil and management data as well as yield, grain number, above ground biomass, leaf area index, nitrogen concentration in biomass and grain, water use and soil water content. Models differed in their representation of carbon assimilation and evapotranspiration processes. The models reproduced the absence of yield response to elevated [CO2] under well-watered conditions, as well as the impact of water deficit at ambient [CO2], with 50% of models within a range of +/−1 Mg ha−1 around the mean. The bias of the median of the 21 models was less than 1 Mg ha−1. However under water deficit in one of the two years, the models captured only 30% of the exceptionally high [CO2] enhancement on yield observed. Furthermore the ensemble of models was unable to simulate the very low soil water content at anthesis and the increase of soil water and grain number brought about by the elevated [CO2] under dry conditions. Overall, we found models with explicit stomatal control on transpiration tended to perform better. Our results highlight the need for model improvement with respect to simulating transpirational water use and its impact on water status during the kernel-set phase.

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    European Journal of Agronomy
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    Agritrop
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    European Journal of Agronomy
    Article . 2018 . Peer-reviewed
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      European Journal of Agronomy
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      European Journal of Agronomy
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    Authors: Ahmad Hamidov; Katrin Daedlow; Heidi Webber; Hussam Hussein; +6 Authors

    Dans les systèmes socio-écologiques, la gestion des ressources naturelles peut être caractérisée par des compromis entre les secteurs et les objectifs de durabilité. Le concept de lien eau-énergie-alimentation (WEF) fait explicitement divers compromis afin de maximiser les synergies des interventions. Cependant, il existe peu d'exemples réussis de son opérationnalisation dans les contextes de recherche. Ici, nous explorons dans un contexte d'apprentissage si les protocoles d'évaluation de l'impact sur la durabilité (SIA) peuvent être un processus utile à utiliser pour adopter une perspective systémique et interdisciplinaire pour opérationnaliser le lien WEF dans la recherche pour le développement durable. Le processus et la méthode adoptés du protocole SIA, évaluées pour cinq cas exemplaires de lien avec le FEM en Asie centrale au cours d'un atelier international d'une semaine, ont abordé de manière adéquate la complexité des interrelations du FEM et les questions de durabilité associées, et ont facilité une analyse comparative des études de cas à différentes échelles. Les résultats de ce processus soulignent que la gouvernance de l'eau était essentielle pour la gestion transfrontalière à grande échelle du lien avec le FEM, tandis que la gestion des terres et des sols était décisive pour minimiser les compromis au niveau local. Les questions d'interdisciplinarité, de complexité, d'incertitude et de réflexion sur les impacts ont été abordées de manière adéquate, mais des défis subsistent dans la prise en compte de l'éthique et la conception d'une approche transparente, la coopération multi-acteurs. Plus important encore, cet exercice a montré que l'utilisation du processus du protocole SIA aidait les experts disciplinaires à travailler dans toutes les disciplines et à adopter une approche systémique pour analyser le lien avec le FEM. En los sistemas socioecológicos, la gestión de los recursos naturales puede caracterizarse por compensaciones entre sectores y objetivos de sostenibilidad. El concepto de nexo agua-energía-alimentos (WEF) hace explícitas varias compensaciones para maximizar las sinergias de las intervenciones. Sin embargo, hay pocos ejemplos exitosos de su operacionalización en entornos de investigación. Aquí, exploramos en un entorno de aprendizaje si los protocolos de evaluación de impacto de sostenibilidad (SIA) pueden ser un proceso útil para ser utilizado para adoptar una perspectiva sistémica e interdisciplinaria para operacionalizar el nexo WEF en la investigación para el desarrollo sostenible. El proceso y el método adoptados del protocolo SIA, evaluado para cinco casos ejemplares de nexo del FEM en Asia Central durante un taller internacional de una semana de duración, abordó adecuadamente la complejidad de las interrelaciones del FEM y los problemas de sostenibilidad asociados, y facilitó un análisis comparativo de estudios de casos en todas las escalas. Los resultados dentro de este proceso destacan que la gobernanza del agua era fundamental para la gestión del nexo del FEM transfronterizo a gran escala, mientras que la gestión de la tierra y el suelo era decisiva para minimizar las compensaciones a nivel local. Las cuestiones de interdisciplinariedad, complejidad, incertidumbre y reflexión sobre los impactos se abordaron adecuadamente, pero siguen existiendo desafíos en la consideración de la ética y el diseño de, cooperación de múltiples actores. Lo más importante es que este ejercicio mostró que el empleo del proceso del protocolo SIA apoyó a los expertos disciplinarios para trabajar en todas las disciplinas y adoptar un enfoque sistémico para analizar el nexo del WEF. In social-ecological systems, natural resource management can be characterized by trade-offs across sectors and sustainability targets.The water-energy-food (WEF) nexus concept makes explicit various trade-offs in order to maximize synergies of interventions.However, there are few successful examples of its operationalization in research settings.Here, we explore in a learning setting if sustainability impact assessment (SIA) protocols can be a useful process to be used to adopt a systemic, interdisciplinary perspective to operationalize WEF nexus in research for sustainable development.The process and method adopted of SIA protocol, evaluated for five exemplary WEF nexus cases in Central Asia during a week-long international workshop, adequately addressed the complexity of WEF interrelationships and associated sustainability issues, and facilitated a comparative case study analysis across scales.Results within this process highlight that water governance was critical for large-scale transboundary WEF nexus management, while land and soil management were decisive for minimizing trade-offs at local levels.Issues of interdisciplinarity, complexity, uncertainty, and reflection on impacts were adequately addressed, but challenges remain in the consideration of ethics and the design of transparent, multi-actor cooperation.Most importantly, this exercise showed that employment of the process of SIA protocol supported disciplinary experts to work across disciplines and take a systemic approach for analyzing WEF nexus. في النظم الاجتماعية والبيئية، يمكن أن تتميز إدارة الموارد الطبيعية بالمقايضات عبر القطاعات وأهداف الاستدامة. يوضح مفهوم العلاقة بين المياه والطاقة والغذاء (WEF) مقايضات مختلفة صريحة من أجل تحقيق أقصى قدر من التآزر بين التدخلات. ومع ذلك، هناك عدد قليل من الأمثلة الناجحة لتفعيلها في بيئات البحث. هنا، نستكشف في بيئة التعلم ما إذا كانت بروتوكولات تقييم تأثير الاستدامة (SIA) يمكن أن تكون عملية مفيدة لاستخدامها لتبني منظور منهجي متعدد التخصصات لتفعيل العلاقة بين WEF في البحث من أجل التنمية المستدامة. العملية والطريقة المعتمدة لبروتوكول SIA، تم تقييمها لخمس حالات نموذجية للصلة بين المنتدى الاقتصادي العالمي في آسيا الوسطى خلال ورشة عمل دولية استمرت أسبوعًا، وتناولت بشكل كافٍ تعقيد العلاقات المتبادلة بين المنتدى الاقتصادي العالمي وقضايا الاستدامة المرتبطة بها، وسهلت تحليل دراسة حالة مقارنة عبر المقاييس. تسلط النتائج ضمن هذه العملية الضوء على أن إدارة المياه كانت حاسمة لإدارة الصلة بين المنتدى الاقتصادي العالمي على نطاق واسع عبر الحدود، في حين أن إدارة الأراضي والتربة كانت حاسمة لتقليل المفاضلات على المستويات المحلية. تمت معالجة قضايا تعدد التخصصات والتعقيد وعدم اليقين والتفكير في التأثيرات بشكل كافٍ، ولكن لا تزال هناك تحديات في النظر في الأخلاقيات وتصميم الشفافية، التعاون متعدد الجهات الفاعلة. الأهم من ذلك، أظهر هذا التمرين أن توظيف عملية بروتوكول SIA دعم الخبراء التأديبيين للعمل عبر التخصصات واتخاذ نهج منهجي لتحليل العلاقة بين المنتدى الاقتصادي العالمي.

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    Ecology and Society
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    Authors: Babacar Faye; Heidi Webber; Jesse B. Naab; Dilys S. MacCarthy; +14 Authors

    Pour réduire les risques du changement climatique, les gouvernements ont convenu dans l'Accord de Paris de limiter l'augmentation de la température mondiale à moins de 2,0 °C par rapport aux niveaux préindustriels, avec l'ambition de maintenir le réchauffement à 1,5 °C. La cartographie des réponses d'atténuation appropriées nécessite des informations sur les coûts d'atténuation par rapport aux dommages associés pour les deux niveaux de réchauffement. Dans cette évaluation, une considération critique est l'impact sur les rendements des cultures et la variabilité des rendements dans les régions actuellement confrontées à l'insécurité alimentaire. La présente étude a évalué les impacts de 1,5 °C par rapport à 2,0 °C sur les rendements du maïs, du millet perlé et du sorgho dans la savane soudanaise d'Afrique de l'Ouest en utilisant deux modèles de culture qui ont été calibrés avec des variétés communes issues d'expériences dans la région, la gestion reflétant une gamme de fenêtres de semis typiques. Comme l'intensification durable est encouragée dans la région pour améliorer la sécurité alimentaire, des simulations ont été menées à la fois pour l'utilisation actuelle d'engrais et pour un cas d'intensification (fertilité non limitative). Avec l'utilisation actuelle d'engrais, les résultats ont indiqué des pertes plus élevées de 2 % pour le maïs et le sorgho avec 2,0 °C par rapport au réchauffement de 1,5 °C, sans changement dans les rendements en mil pour aucun des scénarios. Dans le cas de l'intensification, les pertes de rendement dues au changement climatique étaient plus importantes qu'avec les niveaux actuels d'engrais. Cependant, malgré les pertes plus importantes, les rendements ont toujours été deux à trois fois plus élevés avec l'intensification, quel que soit le scénario de réchauffement. Bien que la variabilité du rendement ait augmenté avec l'intensification, il n'y avait aucune interaction avec le scénario de réchauffement. Une analyse des risques et du marché est nécessaire pour étendre ces résultats afin de comprendre les implications pour la sécurité alimentaire. Para reducir los riesgos del cambio climático, los gobiernos acordaron en el Acuerdo de París limitar el aumento de la temperatura global a menos de 2,0 °C por encima de los niveles preindustriales, con la ambición de mantener el calentamiento a 1,5 °C. El trazado de las respuestas de mitigación apropiadas requiere información sobre los costos de la mitigación frente a los daños asociados para los dos niveles de calentamiento. En esta evaluación, una consideración crítica es el impacto en los rendimientos de los cultivos y la variabilidad del rendimiento en las regiones actualmente desafiadas por la inseguridad alimentaria. El estudio actual evaluó los impactos de 1,5 °C frente a 2,0 °C en los rendimientos de maíz, mijo perla y sorgo en la sabana de Sudán de África Occidental utilizando dos modelos de cultivo que se calibraron con variedades comunes de experimentos en la región con un manejo que refleja una gama de ventanas de siembra típicas. A medida que se promueve la intensificación sostenible en la región para mejorar la seguridad alimentaria, se realizaron simulaciones tanto para el uso actual de fertilizantes como para un caso de intensificación (fertilidad no limitante). Con el uso actual de fertilizantes, los resultados indicaron pérdidas un 2% mayores para el maíz y el sorgo con 2,0 °C en comparación con el calentamiento de 1,5 °C, sin cambios en los rendimientos de mijo para ninguno de los dos escenarios. En el caso de la intensificación, las pérdidas de rendimiento debido al cambio climático fueron mayores que con los niveles actuales de fertilizantes. Sin embargo, a pesar de las mayores pérdidas, los rendimientos siempre fueron de dos a tres veces más altos con la intensificación, independientemente del escenario de calentamiento. Aunque la variabilidad del rendimiento aumentó con la intensificación, no hubo interacción con el escenario de calentamiento. Se necesitan análisis de riesgos y de mercado para ampliar estos resultados y comprender las implicaciones para la seguridad alimentaria. To reduce the risks of climate change, governments agreed in the Paris Agreement to limit global temperature rise to less than 2.0 °C above pre-industrial levels, with the ambition to keep warming to 1.5 °C. Charting appropriate mitigation responses requires information on the costs of mitigating versus associated damages for the two levels of warming. In this assessment, a critical consideration is the impact on crop yields and yield variability in regions currently challenged by food insecurity. The current study assessed impacts of 1.5 °C versus 2.0 °C on yields of maize, pearl millet and sorghum in the West African Sudan Savanna using two crop models that were calibrated with common varieties from experiments in the region with management reflecting a range of typical sowing windows. As sustainable intensification is promoted in the region for improving food security, simulations were conducted for both current fertilizer use and for an intensification case (fertility not limiting). With current fertilizer use, results indicated 2% units higher losses for maize and sorghum with 2.0 °C compared to 1.5 °C warming, with no change in millet yields for either scenario. In the intensification case, yield losses due to climate change were larger than with current fertilizer levels. However, despite the larger losses, yields were always two to three times higher with intensification, irrespective of the warming scenario. Though yield variability increased with intensification, there was no interaction with warming scenario. Risk and market analysis are needed to extend these results to understand implications for food security. للحد من مخاطر تغير المناخ، اتفقت الحكومات في اتفاقية باريس على الحد من ارتفاع درجة الحرارة العالمية إلى أقل من 2.0 درجة مئوية فوق مستويات ما قبل الصناعة، مع طموح للحفاظ على ارتفاع درجة الحرارة إلى 1.5 درجة مئوية. يتطلب رسم استجابات التخفيف المناسبة معلومات عن تكاليف التخفيف مقابل الأضرار المرتبطة بمستويي الاحترار. في هذا التقييم، يتمثل أحد الاعتبارات الهامة في التأثير على غلة المحاصيل وتقلب الغلة في المناطق التي تواجه حاليًا انعدام الأمن الغذائي. قيمت الدراسة الحالية تأثيرات 1.5 درجة مئوية مقابل 2.0 درجة مئوية على غلة الذرة والدخن اللؤلؤي والذرة الرفيعة في سافانا غرب إفريقيا باستخدام نموذجين للمحاصيل تمت معايرتهما بأصناف شائعة من التجارب في المنطقة مع الإدارة التي تعكس مجموعة من نوافذ البذر النموذجية. ومع تعزيز التكثيف المستدام في المنطقة لتحسين الأمن الغذائي، أجريت عمليات محاكاة لكل من الاستخدام الحالي للأسمدة وحالة التكثيف (الخصوبة غير محدودة). مع استخدام الأسمدة الحالي، أشارت النتائج إلى خسائر أعلى بنسبة 2 ٪ للذرة والذرة الرفيعة مع 2.0 درجة مئوية مقارنة بالاحترار 1.5 درجة مئوية، مع عدم وجود تغيير في غلة الدخن لأي من السيناريوهين. في حالة التكثيف، كانت خسائر الغلة بسبب تغير المناخ أكبر من مستويات الأسمدة الحالية. ومع ذلك، على الرغم من الخسائر الأكبر، كانت الغلة دائمًا أعلى مرتين إلى ثلاث مرات مع التكثيف، بغض النظر عن سيناريو الاحترار. على الرغم من زيادة تقلب المحصول مع التكثيف، لم يكن هناك تفاعل مع سيناريو الاحترار. هناك حاجة إلى تحليل المخاطر والسوق لتوسيع نطاق هذه النتائج لفهم الآثار المترتبة على الأمن الغذائي.

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    Environmental Research Letters
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      Environmental Research Letters
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    Authors: J. S. Fu; Yiwei Jian; Xuhui Wang; Zhaoxin Li; +15 Authors

    Les événements climatiques extrêmes constituent un risque majeur pour la production alimentaire mondiale. Parmi ceux-ci, les précipitations extrêmes sont souvent écartées des analyses historiques et des projections futures, dont les impacts et les mécanismes restent mal compris. Ici, nous avons utilisé des observations à long terme à l'échelle nationale et des expériences de manipulation des précipitations à plusieurs niveaux pour explorer l'ampleur et les mécanismes des impacts des précipitations extrêmes sur le rendement du riz en Chine. Nous constatons que les réductions de rendement du riz dues aux précipitations extrêmes étaient comparables à celles induites par la chaleur extrême au cours des deux dernières décennies, atteignant 7,6 ± 0,9% (une erreur type) selon les observations à l'échelle nationale et 8,1 ± 1,1% selon le modèle de culture intégrant les mécanismes révélés par les expériences de manipulation. Les précipitations extrêmes réduisent le rendement du riz principalement en limitant la disponibilité de l'azote pour le travail du sol, ce qui réduit les panicules efficaces par zone, et en perturbant physiquement la pollinisation, ce qui diminue les grains remplis par panique. Compte tenu de ces mécanismes, nous prévoyons une réduction supplémentaire du rendement d'environ8% en raison des précipitations extrêmes sous un climat plus chaud d'ici la fin du siècle. Ces résultats démontrent qu'il est essentiel de tenir compte des précipitations extrêmes dans les évaluations de la sécurité alimentaire. Los fenómenos climáticos extremos constituyen un riesgo importante para la producción mundial de alimentos. Entre estos, las precipitaciones extremas a menudo se descartan de los análisis históricos y las proyecciones futuras, cuyos impactos y mecanismos siguen siendo poco conocidos. Aquí utilizamos observaciones a largo plazo a nivel nacional y experimentos de manipulación de lluvias multinivel para explorar la magnitud y los mecanismos de los impactos extremos de las lluvias en el rendimiento del arroz en China. Encontramos que las reducciones del rendimiento del arroz debido a las precipitaciones extremas fueron comparables a las inducidas por el calor extremo en las últimas dos décadas, alcanzando el 7,6 ± 0,9% (un error estándar) según las observaciones a nivel nacional y el 8,1 ± 1,1% según el modelo de cultivo que incorpora los mecanismos revelados a partir de experimentos manipulativos. Las precipitaciones extremas reducen el rendimiento del arroz principalmente al limitar la disponibilidad de nitrógeno para el macollaje que reduce las panículas efectivas por área y al ejercer una perturbación física en la polinización que disminuye los granos rellenos por panícula. Teniendo en cuenta estos mecanismos, proyectamos una reducción adicional del rendimiento de ~8% debido a las precipitaciones extremas en climas más cálidos para finales de siglo. Estos hallazgos demuestran que es fundamental tener en cuenta las precipitaciones extremas en las evaluaciones de seguridad alimentaria. Extreme climate events constitute a major risk to global food production. Among these, extreme rainfall is often dismissed from historical analyses and future projections, the impacts and mechanisms of which remain poorly understood. Here we used long-term nationwide observations and multi-level rainfall manipulative experiments to explore the magnitude and mechanisms of extreme rainfall impacts on rice yield in China. We find that rice yield reductions due to extreme rainfall were comparable to those induced by extreme heat over the last two decades, reaching 7.6 ± 0.9% (one standard error) according to nationwide observations and 8.1 ± 1.1% according to the crop model incorporating the mechanisms revealed from manipulative experiments. Extreme rainfall reduces rice yield mainly by limiting nitrogen availability for tillering that lowers per-area effective panicles and by exerting physical disturbance on pollination that declines per-panicle filled grains. Considering these mechanisms, we projected ~8% additional yield reduction due to extreme rainfall under warmer climate by the end of the century. These findings demonstrate that it is critical to account for extreme rainfall in food security assessments. تشكل الظواهر المناخية المتطرفة خطرًا كبيرًا على الإنتاج الغذائي العالمي. من بين هذه العوامل، غالبًا ما يتم استبعاد هطول الأمطار الغزيرة من التحليلات التاريخية والتوقعات المستقبلية، والتي لا تزال آثارها وآلياتها غير مفهومة جيدًا. هنا استخدمنا الملاحظات طويلة الأجل على الصعيد الوطني وتجارب التلاعب بهطول الأمطار متعددة المستويات لاستكشاف حجم وآليات تأثيرات هطول الأمطار الشديدة على محصول الأرز في الصين. نجد أن انخفاضات غلة الأرز بسبب هطول الأمطار الغزيرة كانت مماثلة لتلك الناجمة عن الحرارة الشديدة على مدى العقدين الماضيين، حيث وصلت إلى 7.6 ± 0.9 ٪ (خطأ قياسي واحد) وفقًا للملاحظات على مستوى البلاد و 8.1 ± 1.1 ٪ وفقًا لنموذج المحاصيل الذي يتضمن الآليات التي تم الكشف عنها من التجارب التلاعبية. يقلل هطول الأمطار الغزيرة من غلة الأرز بشكل أساسي عن طريق الحد من توافر النيتروجين للحراثة التي تقلل من السنابل الفعالة لكل منطقة وعن طريق ممارسة الاضطراب الجسدي على التلقيح الذي يقلل من الحبوب المملوءة بالجسيمات. وبالنظر إلى هذه الآليات، توقعنا انخفاضًا إضافيًا في الغلة بنسبة 8 ٪ تقريبًا بسبب هطول الأمطار الغزيرة في ظل مناخ أكثر دفئًا بحلول نهاية القرن. توضح هذه النتائج أنه من الأهمية بمكان مراعاة هطول الأمطار الغزيرة في تقييمات الأمن الغذائي.

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    Nature Food
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    Authors: Davide Cammarano; Mikhail A. Semenov; Heidi Horan; Yujing Gao; +72 Authors

    AbstractWheat grain protein concentration is an important determinant of wheat quality for human nutrition that is often overlooked in efforts to improve crop production. We tested and applied a 32‐multi‐model ensemble to simulate global wheat yield and quality in a changing climate. Potential benefits of elevated atmospheric CO2 concentration by 2050 on global wheat grain and protein yield are likely to be negated by impacts from rising temperature and changes in rainfall, but with considerable disparities between regions. Grain and protein yields are expected to be lower and more variable in most low‐rainfall regions, with nitrogen availability limiting growth stimulus from elevated CO2. Introducing genotypes adapted to warmer temperatures (and also considering changes in CO2 and rainfall) could boost global wheat yield by 7% and protein yield by 2%, but grain protein concentration would be reduced by −1.1 percentage points, representing a relative change of −8.6%. Climate change adaptations that benefit grain yield are not always positive for grain quality, putting additional pressure on global wheat production.

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    ProdInra
    Article . 2019
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    Global Change Biology
    Article . 2018 . Peer-reviewed
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    Article . 2019 . Peer-reviewed
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Kamali, Bahareh; Lorite, Ignacio J.; Webber, Heidi; Rezaei, Ehsan Eyshi; +6 Authors

    AbstractThis study investigates the main drivers of uncertainties in simulated irrigated maize yield under historical conditions as well as scenarios of increased temperatures and altered irrigation water availability. Using APSIM, MONICA, and SIMPLACE crop models, we quantified the relative contributions of three irrigation water allocation strategies, three sowing dates, and three maize cultivars to the uncertainty in simulated yields. The water allocation strategies were derived from historical records of farmer’s allocation patterns in drip-irrigation scheme of the Genil-Cabra region, Spain (2014–2017). By considering combinations of allocation strategies, the adjusted R2 values (showing the degree of agreement between simulated and observed yields) increased by 29% compared to unrealistic assumptions of considering only near optimal or deficit irrigation scheduling. The factor decomposition analysis based on historic climate showed that irrigation strategies was the main driver of uncertainty in simulated yields (66%). However, under temperature increase scenarios, the contribution of crop model and cultivar choice to uncertainty in simulated yields were as important as irrigation strategy. This was partially due to different model structure in processes related to the temperature responses. Our study calls for including information on irrigation strategies conducted by farmers to reduce the uncertainty in simulated yields at field scale.

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    Scientific Reports
    Article . 2022 . Peer-reviewed
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23 Research products
  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Yean‐Uk Kim; Heidi Webber; Samuel G.K. Adiku; Rogério de Souza Nóia Júnior; +3 Authors

    Comme l'intensité et la fréquence des phénomènes météorologiques extrêmes devraient augmenter sous l'effet du changement climatique, il est de plus en plus essentiel d'évaluer leur impact sur les systèmes de culture et d'explorer les options d'adaptation possibles. Les modèles de culture basés sur les processus (PBCM), qui sont largement utilisés dans les évaluations d'impact du changement climatique, ont amélioré la simulation des impacts des événements météorologiques extrêmes majeurs tels que les vagues de chaleur et les sécheresses, mais ne parviennent toujours pas à reproduire de faibles rendements agricoles dans des conditions humides. Ici, nous donnons un aperçu des mécanismes de perte de rendement des précipitations excessives dans les céréales (c'est-à-dire l'engorgement, la submersion, l'hébergement, les ravageurs et les maladies) et des approches de modélisation associées dans le but de guider les améliorations de la PBCM. Certains PBCM simulent des environnements d'engorgement et d'étang, mais peu capturent les contraintes d'aération sur la croissance des cultures. L'hébergement est souvent négligé par les PBCM ; cependant, certains modèles d'hébergement mécanistes autonomes existent, qui peuvent potentiellement être incorporés dans les PBCM. Certains cadres relient les modèles d'épidémie et de culture basés sur les processus à la prise en compte de différents mécanismes de dommages. Cependant, le manque de données pour calibrer et évaluer ces fonctions de modèle limite l'utilisation de tels cadres. Afin de générer des données pour l'amélioration du modèle et combler les lacunes dans les connaissances, des expériences ciblées sur les mécanismes de dommages de l'engorgement, de la submersion, des ravageurs et des maladies sont nécessaires. Cependant, la prise en compte de tous les mécanismes de dommage dans le PBCM peut entraîner des modèles excessivement complexes avec un grand nombre de paramètres, augmentant l'incertitude du modèle. Des cadres modulaires pourraient aider à sélectionner les mécanismes nécessaires et conduire à des structures de modèle et à une complexité appropriées qui correspondent à une question de recherche spécifique. Enfin, il existe des synergies potentielles entre les PBCM, les modèles statistiques et les données de télédétection qui pourraient améliorer l'exactitude des prédictions et la compréhension des lacunes actuelles des PBCM. A medida que se proyecta que la intensidad y la frecuencia de los fenómenos meteorológicos extremos aumentarán bajo el cambio climático, evaluar su impacto en los sistemas de cultivo y explorar opciones de adaptación factibles es cada vez más crítico. Los modelos de cultivos basados en procesos (PBCM), que se utilizan ampliamente en las evaluaciones de impacto del cambio climático, han mejorado en la simulación de los impactos de los principales fenómenos meteorológicos extremos, como las olas de calor y las sequías, pero aún no logran reproducir los bajos rendimientos de los cultivos en condiciones húmedas. Aquí, proporcionamos una descripción general de los mecanismos de pérdida de rendimiento de la lluvia excesiva en los cereales (es decir, anegamiento, inmersión, alojamiento, plagas y enfermedades) y los enfoques de modelado asociados con el objetivo de guiar las mejoras de PBCM. Algunos PBCM simulan ambientes de anegamiento y estanque, pero pocos capturan las tensiones de aireación en el crecimiento de los cultivos. Los PBCM a menudo descuidan el alojamiento; sin embargo, existen algunos modelos de alojamiento mecanicistas independientes, que potencialmente pueden incorporarse a los PBCM. Algunos marcos vinculan los modelos de epidemias y cultivos basados en procesos con la consideración de diferentes mecanismos de daño. Sin embargo, la falta de datos para calibrar y evaluar estas funciones del modelo limita el uso de dichos marcos. Con el fin de generar datos para la mejora del modelo y cerrar las brechas de conocimiento, se requieren experimentos específicos sobre los mecanismos de daño de anegamiento, inmersión, plagas y enfermedades. Sin embargo, la consideración de todos los mecanismos de daño en PBCM puede resultar en modelos excesivamente complejos con una gran cantidad de parámetros, lo que aumenta la incertidumbre del modelo. Los marcos modulares podrían ayudar a seleccionar los mecanismos necesarios y conducir a estructuras modelo y complejidad apropiadas que se ajusten a una pregunta de investigación específica. Por último, existen posibles sinergias entre los PBCM, los modelos estadísticos y los datos de teledetección que podrían mejorar la precisión de la predicción y la comprensión de las deficiencias actuales de los PBCM. As the intensity and frequency of extreme weather events are projected to increase under climate change, assessing their impact on cropping systems and exploring feasible adaptation options is increasingly critical. Process-based crop models (PBCMs), which are widely used in climate change impact assessments, have improved in simulating the impacts of major extreme weather events such as heatwaves and droughts but still fail to reproduce low crop yields under wet conditions. Here, we provide an overview of yield-loss mechanisms of excessive rainfall in cereals (i.e., waterlogging, submergence, lodging, pests and diseases) and associated modelling approaches with the aim of guiding PBCM improvements. Some PBCMs simulate waterlogging and ponding environments, but few capture aeration stresses on crop growth. Lodging is often neglected by PBCMs; however, some stand-alone mechanistic lodging models exist, which can potentially be incorporated into PBCMs. Some frameworks link process-based epidemic and crop models with consideration of different damage mechanisms. However, the lack of data to calibrate and evaluate these model functions limit the use of such frameworks. In order to generate data for model improvement and close knowledge gaps, targeted experiments on damage mechanisms of waterlogging, submergence, pests and diseases are required. However, consideration of all damage mechanisms in PBCM may result in excessively complex models with a large number of parameters, increasing model uncertainty. Modular frameworks could assist in selecting necessary mechanisms and lead to appropriate model structures and complexity that fit a specific research question. Lastly, there are potential synergies between PBCMs, statistical models, and remotely sensed data that could improve the prediction accuracy and understanding of current PBCMs' shortcomings. نظرًا لأنه من المتوقع أن تزداد شدة وتواتر الظواهر الجوية القاسية في ظل تغير المناخ، فإن تقييم تأثيرها على أنظمة المحاصيل واستكشاف خيارات التكيف الممكنة أمر بالغ الأهمية بشكل متزايد. تحسنت نماذج المحاصيل القائمة على العمليات (PBCMs)، والتي تستخدم على نطاق واسع في تقييمات تأثير تغير المناخ، في محاكاة آثار الظواهر الجوية القاسية الرئيسية مثل موجات الحر والجفاف ولكنها لا تزال تفشل في إعادة إنتاج غلة محاصيل منخفضة في ظل الظروف الرطبة. هنا، نقدم لمحة عامة عن آليات فقدان الغلة للأمطار المفرطة في الحبوب (أي التشبع بالمياه، والغمر، والسكن، والآفات والأمراض) ونهج النمذجة المرتبطة بها بهدف توجيه تحسينات PBCM. تحاكي بعض PBCMs بيئات التشبع بالمياه والبرك، لكن القليل منها يلتقط ضغوط التهوية على نمو المحاصيل. غالبًا ما يتم إهمال السكن من قبل PBCMs ؛ ومع ذلك، توجد بعض نماذج السكن الميكانيكية المستقلة، والتي يمكن دمجها في PBCMs. تربط بعض الأطر نماذج الأوبئة والمحاصيل القائمة على العمليات مع مراعاة آليات الضرر المختلفة. ومع ذلك، فإن نقص البيانات لمعايرة وتقييم هذه الوظائف النموذجية يحد من استخدام هذه الأطر. من أجل توليد بيانات لتحسين النموذج وسد الفجوات المعرفية، يلزم إجراء تجارب مستهدفة على آليات الأضرار الناجمة عن التشبع بالمياه والغمر والآفات والأمراض. ومع ذلك، قد يؤدي النظر في جميع آليات الضرر في PBCM إلى نماذج معقدة للغاية مع عدد كبير من المعلمات، مما يزيد من عدم اليقين في النموذج. يمكن أن تساعد الأطر المعيارية في اختيار الآليات اللازمة وتؤدي إلى هياكل نموذجية مناسبة وتعقيد يناسب سؤالًا بحثيًا محددًا. أخيرًا، هناك أوجه تآزر محتملة بين PBCMs والنماذج الإحصائية والبيانات المستشعرة عن بُعد والتي يمكن أن تحسن دقة التنبؤ وفهم أوجه القصور الحالية في PBCMs.

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    Agricultural and Forest Meteorology
    Article . 2024 . Peer-reviewed
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      Agricultural and Forest Meteorology
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Tommaso Stella; Heidi Webber; Ehsan Eyshi Rezaei; Senthold Asseng; +15 Authors

    Abstract Increasing genetic wheat yield potential is considered by many as critical to increasing global wheat yields and production, baring major changes in consumption patterns. Climate change challenges breeding by making target environments less predictable, altering regional productivity and potentially increasing yield variability. Here we used a crop simulation model solution in the SIMPLACE framework to explore yield sensitivity to select trait characteristics (radiation use efficiency [RUE], fruiting efficiency and light extinction coefficient) across 34 locations representing the world’s wheat-producing environments, determining their relationship to increasing yields, yield variability and cultivar performance. The magnitude of the yield increase was trait-dependent and differed between irrigated and rainfed environments. RUE had the most prominent marginal effect on yield, which increased by about 45 % and 33 % in irrigated and rainfed sites, respectively, between the minimum and maximum value of the trait. Altered values of light extinction coefficient had the least effect on yield levels. Higher yields from improved traits were generally associated with increased inter-annual yield variability (measured by standard deviation), but the relative yield variability (as coefficient of variation) remained largely unchanged between base and improved genotypes. This was true under both current and future climate scenarios. In this context, our study suggests higher wheat yields from these traits would not increase climate risk for farmers and the adoption of cultivars with these traits would not be associated with increased yield variability.

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    in silico Plants
    Article . 2023 . Peer-reviewed
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      in silico Plants
      Article . 2023 . Peer-reviewed
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    Authors: Gatien N. Falconnier; Marc Corbeels; Kenneth J. Boote; François Affholder; +52 Authors

    AbstractSmallholder farmers in sub‐Saharan Africa (SSA) currently grow rainfed maize with limited inputs including fertilizer. Climate change may exacerbate current production constraints. Crop models can help quantify the potential impact of climate change on maize yields, but a comprehensive multimodel assessment of simulation accuracy and uncertainty in these low‐input systems is currently lacking. We evaluated the impact of varying [CO2], temperature and rainfall conditions on maize yield, for different nitrogen (N) inputs (0, 80, 160 kg N/ha) for five environments in SSA, including cool subhumid Ethiopia, cool semi‐arid Rwanda, hot subhumid Ghana and hot semi‐arid Mali and Benin using an ensemble of 25 maize models. Models were calibrated with measured grain yield, plant biomass, plant N, leaf area index, harvest index and in‐season soil water content from 2‐year experiments in each country to assess their ability to simulate observed yield. Simulated responses to climate change factors were explored and compared between models. Calibrated models reproduced measured grain yield variations well with average relative root mean square error of 26%, although uncertainty in model prediction was substantial (CV = 28%). Model ensembles gave greater accuracy than any model taken at random. Nitrogen fertilization controlled the response to variations in [CO2], temperature and rainfall. Without N fertilizer input, maize (a) benefited less from an increase in atmospheric [CO2]; (b) was less affected by higher temperature or decreasing rainfall; and (c) was more affected by increased rainfall because N leaching was more critical. The model intercomparison revealed that simulation of daily soil N supply and N leaching plays a crucial role in simulating climate change impacts for low‐input systems. Climate change and N input interactions have strong implications for the design of robust adaptation approaches across SSA, because the impact of climate change in low input systems will be modified if farmers intensify maize production with balanced nutrient management.

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    Agritrop
    Article . 2020
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    Global Change Biology
    Article . 2020 . Peer-reviewed
    License: Wiley Online Library User Agreement
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    Authors: Dueri, Sibylle; Brown, Hamish; Asseng, Senthold; Ewert, Frank; +50 Authors

    Abstract Crop multi-model ensembles (MME) have proven to be effective in increasing the accuracy of simulations in modelling experiments. However, the ability of MME to capture crop responses to changes in sowing dates and densities has not yet been investigated. These management interventions are some of the main levers for adapting cropping systems to climate change. Here, we explore the performance of a MME of 29 wheat crop models to predict the effect of changing sowing dates and rates on yield and yield components, on two sites located in a high-yielding environment in New Zealand. The experiment was conducted for 6 years and provided 50 combinations of sowing date, sowing density and growing season. We show that the MME simulates seasonal growth of wheat well under standard sowing conditions, but fails under early sowing and high sowing rates. The comparison between observed and simulated in-season fraction of intercepted photosynthetically active radiation (FIPAR) for early sown wheat shows that the MME does not capture the decrease of crop above ground biomass during winter months due to senescence. Models need to better account for tiller competition for light, nutrients, and water during vegetative growth, and early tiller senescence and tiller mortality, which are exacerbated by early sowing, high sowing densities, and warmer winter temperatures.

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    Journal of Experimental Botany
    Article . 2022 . Peer-reviewed
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    Wageningen Staff Publications
    Article . 2022
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    https://dx.doi.org/10.60692/3f...
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    Digital.CSIC
    Article . 2022 . Peer-reviewed
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      Journal of Experimental Botany
      Article . 2022 . Peer-reviewed
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      Wageningen Staff Publications
      Article . 2022
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      Digital.CSIC
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    Authors: INRA, URP3F, France ( host institution ); Durand, Jean-Louis ( author ); Delusca, Kenel ( author ); Boote, Ken ( UF author ); +34 Authors

    This study assesses the ability of 21 crop models to capture the impact of elevated CO2 concentration ([CO2]) on maize yield and water use as measured in a 2-year Free Air Carbon dioxide Enrichment experiment conducted at the Thunen Institute in Braunschweig, Germany (Manderscheid et al., 2014). Data for ambient [CO2] and irrigated treatments were provided to the 21 models for calibrating plant traits, including weather, soil and management data as well as yield, grain number, above ground biomass, leaf area index, nitrogen concentration in biomass and grain, water use and soil water content. Models differed in their representation of carbon assimilation and evapotranspiration processes. The models reproduced the absence of yield response to elevated [CO2] under well-watered conditions, as well as the impact of water deficit at ambient [CO2], with 50% of models within a range of +/−1 Mg ha−1 around the mean. The bias of the median of the 21 models was less than 1 Mg ha−1. However under water deficit in one of the two years, the models captured only 30% of the exceptionally high [CO2] enhancement on yield observed. Furthermore the ensemble of models was unable to simulate the very low soil water content at anthesis and the increase of soil water and grain number brought about by the elevated [CO2] under dry conditions. Overall, we found models with explicit stomatal control on transpiration tended to perform better. Our results highlight the need for model improvement with respect to simulating transpirational water use and its impact on water status during the kernel-set phase.

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    European Journal of Agronomy
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    Agritrop
    Article . 2017
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    European Journal of Agronomy
    Article . 2018 . Peer-reviewed
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      European Journal of Agronomy
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      European Journal of Agronomy
      Article . 2018 . Peer-reviewed
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    Authors: Ahmad Hamidov; Katrin Daedlow; Heidi Webber; Hussam Hussein; +6 Authors

    Dans les systèmes socio-écologiques, la gestion des ressources naturelles peut être caractérisée par des compromis entre les secteurs et les objectifs de durabilité. Le concept de lien eau-énergie-alimentation (WEF) fait explicitement divers compromis afin de maximiser les synergies des interventions. Cependant, il existe peu d'exemples réussis de son opérationnalisation dans les contextes de recherche. Ici, nous explorons dans un contexte d'apprentissage si les protocoles d'évaluation de l'impact sur la durabilité (SIA) peuvent être un processus utile à utiliser pour adopter une perspective systémique et interdisciplinaire pour opérationnaliser le lien WEF dans la recherche pour le développement durable. Le processus et la méthode adoptés du protocole SIA, évaluées pour cinq cas exemplaires de lien avec le FEM en Asie centrale au cours d'un atelier international d'une semaine, ont abordé de manière adéquate la complexité des interrelations du FEM et les questions de durabilité associées, et ont facilité une analyse comparative des études de cas à différentes échelles. Les résultats de ce processus soulignent que la gouvernance de l'eau était essentielle pour la gestion transfrontalière à grande échelle du lien avec le FEM, tandis que la gestion des terres et des sols était décisive pour minimiser les compromis au niveau local. Les questions d'interdisciplinarité, de complexité, d'incertitude et de réflexion sur les impacts ont été abordées de manière adéquate, mais des défis subsistent dans la prise en compte de l'éthique et la conception d'une approche transparente, la coopération multi-acteurs. Plus important encore, cet exercice a montré que l'utilisation du processus du protocole SIA aidait les experts disciplinaires à travailler dans toutes les disciplines et à adopter une approche systémique pour analyser le lien avec le FEM. En los sistemas socioecológicos, la gestión de los recursos naturales puede caracterizarse por compensaciones entre sectores y objetivos de sostenibilidad. El concepto de nexo agua-energía-alimentos (WEF) hace explícitas varias compensaciones para maximizar las sinergias de las intervenciones. Sin embargo, hay pocos ejemplos exitosos de su operacionalización en entornos de investigación. Aquí, exploramos en un entorno de aprendizaje si los protocolos de evaluación de impacto de sostenibilidad (SIA) pueden ser un proceso útil para ser utilizado para adoptar una perspectiva sistémica e interdisciplinaria para operacionalizar el nexo WEF en la investigación para el desarrollo sostenible. El proceso y el método adoptados del protocolo SIA, evaluado para cinco casos ejemplares de nexo del FEM en Asia Central durante un taller internacional de una semana de duración, abordó adecuadamente la complejidad de las interrelaciones del FEM y los problemas de sostenibilidad asociados, y facilitó un análisis comparativo de estudios de casos en todas las escalas. Los resultados dentro de este proceso destacan que la gobernanza del agua era fundamental para la gestión del nexo del FEM transfronterizo a gran escala, mientras que la gestión de la tierra y el suelo era decisiva para minimizar las compensaciones a nivel local. Las cuestiones de interdisciplinariedad, complejidad, incertidumbre y reflexión sobre los impactos se abordaron adecuadamente, pero siguen existiendo desafíos en la consideración de la ética y el diseño de, cooperación de múltiples actores. Lo más importante es que este ejercicio mostró que el empleo del proceso del protocolo SIA apoyó a los expertos disciplinarios para trabajar en todas las disciplinas y adoptar un enfoque sistémico para analizar el nexo del WEF. In social-ecological systems, natural resource management can be characterized by trade-offs across sectors and sustainability targets.The water-energy-food (WEF) nexus concept makes explicit various trade-offs in order to maximize synergies of interventions.However, there are few successful examples of its operationalization in research settings.Here, we explore in a learning setting if sustainability impact assessment (SIA) protocols can be a useful process to be used to adopt a systemic, interdisciplinary perspective to operationalize WEF nexus in research for sustainable development.The process and method adopted of SIA protocol, evaluated for five exemplary WEF nexus cases in Central Asia during a week-long international workshop, adequately addressed the complexity of WEF interrelationships and associated sustainability issues, and facilitated a comparative case study analysis across scales.Results within this process highlight that water governance was critical for large-scale transboundary WEF nexus management, while land and soil management were decisive for minimizing trade-offs at local levels.Issues of interdisciplinarity, complexity, uncertainty, and reflection on impacts were adequately addressed, but challenges remain in the consideration of ethics and the design of transparent, multi-actor cooperation.Most importantly, this exercise showed that employment of the process of SIA protocol supported disciplinary experts to work across disciplines and take a systemic approach for analyzing WEF nexus. في النظم الاجتماعية والبيئية، يمكن أن تتميز إدارة الموارد الطبيعية بالمقايضات عبر القطاعات وأهداف الاستدامة. يوضح مفهوم العلاقة بين المياه والطاقة والغذاء (WEF) مقايضات مختلفة صريحة من أجل تحقيق أقصى قدر من التآزر بين التدخلات. ومع ذلك، هناك عدد قليل من الأمثلة الناجحة لتفعيلها في بيئات البحث. هنا، نستكشف في بيئة التعلم ما إذا كانت بروتوكولات تقييم تأثير الاستدامة (SIA) يمكن أن تكون عملية مفيدة لاستخدامها لتبني منظور منهجي متعدد التخصصات لتفعيل العلاقة بين WEF في البحث من أجل التنمية المستدامة. العملية والطريقة المعتمدة لبروتوكول SIA، تم تقييمها لخمس حالات نموذجية للصلة بين المنتدى الاقتصادي العالمي في آسيا الوسطى خلال ورشة عمل دولية استمرت أسبوعًا، وتناولت بشكل كافٍ تعقيد العلاقات المتبادلة بين المنتدى الاقتصادي العالمي وقضايا الاستدامة المرتبطة بها، وسهلت تحليل دراسة حالة مقارنة عبر المقاييس. تسلط النتائج ضمن هذه العملية الضوء على أن إدارة المياه كانت حاسمة لإدارة الصلة بين المنتدى الاقتصادي العالمي على نطاق واسع عبر الحدود، في حين أن إدارة الأراضي والتربة كانت حاسمة لتقليل المفاضلات على المستويات المحلية. تمت معالجة قضايا تعدد التخصصات والتعقيد وعدم اليقين والتفكير في التأثيرات بشكل كافٍ، ولكن لا تزال هناك تحديات في النظر في الأخلاقيات وتصميم الشفافية، التعاون متعدد الجهات الفاعلة. الأهم من ذلك، أظهر هذا التمرين أن توظيف عملية بروتوكول SIA دعم الخبراء التأديبيين للعمل عبر التخصصات واتخاذ نهج منهجي لتحليل العلاقة بين المنتدى الاقتصادي العالمي.

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Babacar Faye; Heidi Webber; Jesse B. Naab; Dilys S. MacCarthy; +14 Authors

    Pour réduire les risques du changement climatique, les gouvernements ont convenu dans l'Accord de Paris de limiter l'augmentation de la température mondiale à moins de 2,0 °C par rapport aux niveaux préindustriels, avec l'ambition de maintenir le réchauffement à 1,5 °C. La cartographie des réponses d'atténuation appropriées nécessite des informations sur les coûts d'atténuation par rapport aux dommages associés pour les deux niveaux de réchauffement. Dans cette évaluation, une considération critique est l'impact sur les rendements des cultures et la variabilité des rendements dans les régions actuellement confrontées à l'insécurité alimentaire. La présente étude a évalué les impacts de 1,5 °C par rapport à 2,0 °C sur les rendements du maïs, du millet perlé et du sorgho dans la savane soudanaise d'Afrique de l'Ouest en utilisant deux modèles de culture qui ont été calibrés avec des variétés communes issues d'expériences dans la région, la gestion reflétant une gamme de fenêtres de semis typiques. Comme l'intensification durable est encouragée dans la région pour améliorer la sécurité alimentaire, des simulations ont été menées à la fois pour l'utilisation actuelle d'engrais et pour un cas d'intensification (fertilité non limitative). Avec l'utilisation actuelle d'engrais, les résultats ont indiqué des pertes plus élevées de 2 % pour le maïs et le sorgho avec 2,0 °C par rapport au réchauffement de 1,5 °C, sans changement dans les rendements en mil pour aucun des scénarios. Dans le cas de l'intensification, les pertes de rendement dues au changement climatique étaient plus importantes qu'avec les niveaux actuels d'engrais. Cependant, malgré les pertes plus importantes, les rendements ont toujours été deux à trois fois plus élevés avec l'intensification, quel que soit le scénario de réchauffement. Bien que la variabilité du rendement ait augmenté avec l'intensification, il n'y avait aucune interaction avec le scénario de réchauffement. Une analyse des risques et du marché est nécessaire pour étendre ces résultats afin de comprendre les implications pour la sécurité alimentaire. Para reducir los riesgos del cambio climático, los gobiernos acordaron en el Acuerdo de París limitar el aumento de la temperatura global a menos de 2,0 °C por encima de los niveles preindustriales, con la ambición de mantener el calentamiento a 1,5 °C. El trazado de las respuestas de mitigación apropiadas requiere información sobre los costos de la mitigación frente a los daños asociados para los dos niveles de calentamiento. En esta evaluación, una consideración crítica es el impacto en los rendimientos de los cultivos y la variabilidad del rendimiento en las regiones actualmente desafiadas por la inseguridad alimentaria. El estudio actual evaluó los impactos de 1,5 °C frente a 2,0 °C en los rendimientos de maíz, mijo perla y sorgo en la sabana de Sudán de África Occidental utilizando dos modelos de cultivo que se calibraron con variedades comunes de experimentos en la región con un manejo que refleja una gama de ventanas de siembra típicas. A medida que se promueve la intensificación sostenible en la región para mejorar la seguridad alimentaria, se realizaron simulaciones tanto para el uso actual de fertilizantes como para un caso de intensificación (fertilidad no limitante). Con el uso actual de fertilizantes, los resultados indicaron pérdidas un 2% mayores para el maíz y el sorgo con 2,0 °C en comparación con el calentamiento de 1,5 °C, sin cambios en los rendimientos de mijo para ninguno de los dos escenarios. En el caso de la intensificación, las pérdidas de rendimiento debido al cambio climático fueron mayores que con los niveles actuales de fertilizantes. Sin embargo, a pesar de las mayores pérdidas, los rendimientos siempre fueron de dos a tres veces más altos con la intensificación, independientemente del escenario de calentamiento. Aunque la variabilidad del rendimiento aumentó con la intensificación, no hubo interacción con el escenario de calentamiento. Se necesitan análisis de riesgos y de mercado para ampliar estos resultados y comprender las implicaciones para la seguridad alimentaria. To reduce the risks of climate change, governments agreed in the Paris Agreement to limit global temperature rise to less than 2.0 °C above pre-industrial levels, with the ambition to keep warming to 1.5 °C. Charting appropriate mitigation responses requires information on the costs of mitigating versus associated damages for the two levels of warming. In this assessment, a critical consideration is the impact on crop yields and yield variability in regions currently challenged by food insecurity. The current study assessed impacts of 1.5 °C versus 2.0 °C on yields of maize, pearl millet and sorghum in the West African Sudan Savanna using two crop models that were calibrated with common varieties from experiments in the region with management reflecting a range of typical sowing windows. As sustainable intensification is promoted in the region for improving food security, simulations were conducted for both current fertilizer use and for an intensification case (fertility not limiting). With current fertilizer use, results indicated 2% units higher losses for maize and sorghum with 2.0 °C compared to 1.5 °C warming, with no change in millet yields for either scenario. In the intensification case, yield losses due to climate change were larger than with current fertilizer levels. However, despite the larger losses, yields were always two to three times higher with intensification, irrespective of the warming scenario. Though yield variability increased with intensification, there was no interaction with warming scenario. Risk and market analysis are needed to extend these results to understand implications for food security. للحد من مخاطر تغير المناخ، اتفقت الحكومات في اتفاقية باريس على الحد من ارتفاع درجة الحرارة العالمية إلى أقل من 2.0 درجة مئوية فوق مستويات ما قبل الصناعة، مع طموح للحفاظ على ارتفاع درجة الحرارة إلى 1.5 درجة مئوية. يتطلب رسم استجابات التخفيف المناسبة معلومات عن تكاليف التخفيف مقابل الأضرار المرتبطة بمستويي الاحترار. في هذا التقييم، يتمثل أحد الاعتبارات الهامة في التأثير على غلة المحاصيل وتقلب الغلة في المناطق التي تواجه حاليًا انعدام الأمن الغذائي. قيمت الدراسة الحالية تأثيرات 1.5 درجة مئوية مقابل 2.0 درجة مئوية على غلة الذرة والدخن اللؤلؤي والذرة الرفيعة في سافانا غرب إفريقيا باستخدام نموذجين للمحاصيل تمت معايرتهما بأصناف شائعة من التجارب في المنطقة مع الإدارة التي تعكس مجموعة من نوافذ البذر النموذجية. ومع تعزيز التكثيف المستدام في المنطقة لتحسين الأمن الغذائي، أجريت عمليات محاكاة لكل من الاستخدام الحالي للأسمدة وحالة التكثيف (الخصوبة غير محدودة). مع استخدام الأسمدة الحالي، أشارت النتائج إلى خسائر أعلى بنسبة 2 ٪ للذرة والذرة الرفيعة مع 2.0 درجة مئوية مقارنة بالاحترار 1.5 درجة مئوية، مع عدم وجود تغيير في غلة الدخن لأي من السيناريوهين. في حالة التكثيف، كانت خسائر الغلة بسبب تغير المناخ أكبر من مستويات الأسمدة الحالية. ومع ذلك، على الرغم من الخسائر الأكبر، كانت الغلة دائمًا أعلى مرتين إلى ثلاث مرات مع التكثيف، بغض النظر عن سيناريو الاحترار. على الرغم من زيادة تقلب المحصول مع التكثيف، لم يكن هناك تفاعل مع سيناريو الاحترار. هناك حاجة إلى تحليل المخاطر والسوق لتوسيع نطاق هذه النتائج لفهم الآثار المترتبة على الأمن الغذائي.

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    Environmental Research Letters
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      Environmental Research Letters
      Article
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      https://dx.doi.org/10.5445/ir/...
      Article . 2018
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      Environmental Research Letters
      Article . 2018
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      Agritrop
      Article . 2018
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      https://dx.doi.org/10.60692/28...
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    Authors: J. S. Fu; Yiwei Jian; Xuhui Wang; Zhaoxin Li; +15 Authors

    Les événements climatiques extrêmes constituent un risque majeur pour la production alimentaire mondiale. Parmi ceux-ci, les précipitations extrêmes sont souvent écartées des analyses historiques et des projections futures, dont les impacts et les mécanismes restent mal compris. Ici, nous avons utilisé des observations à long terme à l'échelle nationale et des expériences de manipulation des précipitations à plusieurs niveaux pour explorer l'ampleur et les mécanismes des impacts des précipitations extrêmes sur le rendement du riz en Chine. Nous constatons que les réductions de rendement du riz dues aux précipitations extrêmes étaient comparables à celles induites par la chaleur extrême au cours des deux dernières décennies, atteignant 7,6 ± 0,9% (une erreur type) selon les observations à l'échelle nationale et 8,1 ± 1,1% selon le modèle de culture intégrant les mécanismes révélés par les expériences de manipulation. Les précipitations extrêmes réduisent le rendement du riz principalement en limitant la disponibilité de l'azote pour le travail du sol, ce qui réduit les panicules efficaces par zone, et en perturbant physiquement la pollinisation, ce qui diminue les grains remplis par panique. Compte tenu de ces mécanismes, nous prévoyons une réduction supplémentaire du rendement d'environ8% en raison des précipitations extrêmes sous un climat plus chaud d'ici la fin du siècle. Ces résultats démontrent qu'il est essentiel de tenir compte des précipitations extrêmes dans les évaluations de la sécurité alimentaire. Los fenómenos climáticos extremos constituyen un riesgo importante para la producción mundial de alimentos. Entre estos, las precipitaciones extremas a menudo se descartan de los análisis históricos y las proyecciones futuras, cuyos impactos y mecanismos siguen siendo poco conocidos. Aquí utilizamos observaciones a largo plazo a nivel nacional y experimentos de manipulación de lluvias multinivel para explorar la magnitud y los mecanismos de los impactos extremos de las lluvias en el rendimiento del arroz en China. Encontramos que las reducciones del rendimiento del arroz debido a las precipitaciones extremas fueron comparables a las inducidas por el calor extremo en las últimas dos décadas, alcanzando el 7,6 ± 0,9% (un error estándar) según las observaciones a nivel nacional y el 8,1 ± 1,1% según el modelo de cultivo que incorpora los mecanismos revelados a partir de experimentos manipulativos. Las precipitaciones extremas reducen el rendimiento del arroz principalmente al limitar la disponibilidad de nitrógeno para el macollaje que reduce las panículas efectivas por área y al ejercer una perturbación física en la polinización que disminuye los granos rellenos por panícula. Teniendo en cuenta estos mecanismos, proyectamos una reducción adicional del rendimiento de ~8% debido a las precipitaciones extremas en climas más cálidos para finales de siglo. Estos hallazgos demuestran que es fundamental tener en cuenta las precipitaciones extremas en las evaluaciones de seguridad alimentaria. Extreme climate events constitute a major risk to global food production. Among these, extreme rainfall is often dismissed from historical analyses and future projections, the impacts and mechanisms of which remain poorly understood. Here we used long-term nationwide observations and multi-level rainfall manipulative experiments to explore the magnitude and mechanisms of extreme rainfall impacts on rice yield in China. We find that rice yield reductions due to extreme rainfall were comparable to those induced by extreme heat over the last two decades, reaching 7.6 ± 0.9% (one standard error) according to nationwide observations and 8.1 ± 1.1% according to the crop model incorporating the mechanisms revealed from manipulative experiments. Extreme rainfall reduces rice yield mainly by limiting nitrogen availability for tillering that lowers per-area effective panicles and by exerting physical disturbance on pollination that declines per-panicle filled grains. Considering these mechanisms, we projected ~8% additional yield reduction due to extreme rainfall under warmer climate by the end of the century. These findings demonstrate that it is critical to account for extreme rainfall in food security assessments. تشكل الظواهر المناخية المتطرفة خطرًا كبيرًا على الإنتاج الغذائي العالمي. من بين هذه العوامل، غالبًا ما يتم استبعاد هطول الأمطار الغزيرة من التحليلات التاريخية والتوقعات المستقبلية، والتي لا تزال آثارها وآلياتها غير مفهومة جيدًا. هنا استخدمنا الملاحظات طويلة الأجل على الصعيد الوطني وتجارب التلاعب بهطول الأمطار متعددة المستويات لاستكشاف حجم وآليات تأثيرات هطول الأمطار الشديدة على محصول الأرز في الصين. نجد أن انخفاضات غلة الأرز بسبب هطول الأمطار الغزيرة كانت مماثلة لتلك الناجمة عن الحرارة الشديدة على مدى العقدين الماضيين، حيث وصلت إلى 7.6 ± 0.9 ٪ (خطأ قياسي واحد) وفقًا للملاحظات على مستوى البلاد و 8.1 ± 1.1 ٪ وفقًا لنموذج المحاصيل الذي يتضمن الآليات التي تم الكشف عنها من التجارب التلاعبية. يقلل هطول الأمطار الغزيرة من غلة الأرز بشكل أساسي عن طريق الحد من توافر النيتروجين للحراثة التي تقلل من السنابل الفعالة لكل منطقة وعن طريق ممارسة الاضطراب الجسدي على التلقيح الذي يقلل من الحبوب المملوءة بالجسيمات. وبالنظر إلى هذه الآليات، توقعنا انخفاضًا إضافيًا في الغلة بنسبة 8 ٪ تقريبًا بسبب هطول الأمطار الغزيرة في ظل مناخ أكثر دفئًا بحلول نهاية القرن. توضح هذه النتائج أنه من الأهمية بمكان مراعاة هطول الأمطار الغزيرة في تقييمات الأمن الغذائي.

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    Nature Food
    Article . 2023 . Peer-reviewed
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    Nature Food
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    Authors: Davide Cammarano; Mikhail A. Semenov; Heidi Horan; Yujing Gao; +72 Authors

    AbstractWheat grain protein concentration is an important determinant of wheat quality for human nutrition that is often overlooked in efforts to improve crop production. We tested and applied a 32‐multi‐model ensemble to simulate global wheat yield and quality in a changing climate. Potential benefits of elevated atmospheric CO2 concentration by 2050 on global wheat grain and protein yield are likely to be negated by impacts from rising temperature and changes in rainfall, but with considerable disparities between regions. Grain and protein yields are expected to be lower and more variable in most low‐rainfall regions, with nitrogen availability limiting growth stimulus from elevated CO2. Introducing genotypes adapted to warmer temperatures (and also considering changes in CO2 and rainfall) could boost global wheat yield by 7% and protein yield by 2%, but grain protein concentration would be reduced by −1.1 percentage points, representing a relative change of −8.6%. Climate change adaptations that benefit grain yield are not always positive for grain quality, putting additional pressure on global wheat production.

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    ProdInra
    Article . 2019
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    Global Change Biology
    Article . 2018 . Peer-reviewed
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    Article . 2019 . Peer-reviewed
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    Authors: Kamali, Bahareh; Lorite, Ignacio J.; Webber, Heidi; Rezaei, Ehsan Eyshi; +6 Authors

    AbstractThis study investigates the main drivers of uncertainties in simulated irrigated maize yield under historical conditions as well as scenarios of increased temperatures and altered irrigation water availability. Using APSIM, MONICA, and SIMPLACE crop models, we quantified the relative contributions of three irrigation water allocation strategies, three sowing dates, and three maize cultivars to the uncertainty in simulated yields. The water allocation strategies were derived from historical records of farmer’s allocation patterns in drip-irrigation scheme of the Genil-Cabra region, Spain (2014–2017). By considering combinations of allocation strategies, the adjusted R2 values (showing the degree of agreement between simulated and observed yields) increased by 29% compared to unrealistic assumptions of considering only near optimal or deficit irrigation scheduling. The factor decomposition analysis based on historic climate showed that irrigation strategies was the main driver of uncertainty in simulated yields (66%). However, under temperature increase scenarios, the contribution of crop model and cultivar choice to uncertainty in simulated yields were as important as irrigation strategy. This was partially due to different model structure in processes related to the temperature responses. Our study calls for including information on irrigation strategies conducted by farmers to reduce the uncertainty in simulated yields at field scale.

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    Scientific Reports
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