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This study aimed to identify potential sources of organic matter in sediment, using stable isotopes of carbon (delta13C) and nitrogen (delta15N). Sediment samples were gathered from the margin and in center of three subsystems: Ivinheima, Paraná and Baia, in August/2001. The samples were fractionated granulometrically and separated by size (< 200 µm; 70-200 µm; > 70 µm), prepared and sent to CENA / USP, for identifying the isotopes proportions. Significant differences were detected in the isotopic ratios of the sediment only between sampling stations. The Baía channel presented the lowest delta13C values, while the highest ones were recorded in Paraná river. At this last, delta15N values were negative (-14.41‰). We did not verify significant difference in isotopic composition between the particle sizes of sediment, and between the sampling points. The main sources of carbon for the sediment were C3 macrophytes, periphyton and particulate organic carbon (POC).

Neste trabalho avaliou-se o efeito da data de sementeira nas características de produção e composição em açúcares do sorgo sacarino, em função das quais se estimou o potencial de produção de bioetanol a partir desta cultura. O estudo foi conduzido durante dois anos (2005 e 2006), com a variedade de sorgo sacarino Madhura. A sementeira foi efectuada nas datas de 17 de maio, 31 de maio, 14 de junho e 28 de junho. Na sementeira efectuada a 17 de maio a produção de caules verdes e secos atingiu os valores de 66 e 13,8 t ha-1, respectivamente, as quais foram significativamente superiores às obtidas nas sementeiras de junho. A produção máxima de açúcar naquele mês foi de 4,6 t ha-1, o que corresponde à produção estimada de 2300 L ha-1 de bioetanol. Os resultados alcançados permitem concluir que as datas de sementeira de maio foram as que melhor potenciaram a aptidão do sorgo sacarino como cultura energética, para a produção de bioetanol. Revista de Ciências Agrárias, vol. 36 n.º 3 (2013)

Climate change is bound to impact the water cycle and water availability, compounding the sustainable management of its quantity and quality. Groundwater is bound to suffer the impacts of climate change, coupled with those of land use changes, population and its lifestyles evolution. Climate change studies normaly have a 50 to 100 years horizon, which is a challenge for decision makers, who usually rely on relatively short therm data and projections to implement their management policies. BINGO Project tries to address this gap, by providing information of climate change impacts, including those of extreme events, on the water cycle for the short-tomedium term. Climate change impacts on groundwater rely on mathematical modeling, using recharge projections obtained from the climate forecasts of the Regional Climate Models set up for Europe. Sea level change is also a component of this analysis and its ensuing impacts of saltwater intrusion on the coastal and estuarine areas of Aluviões do Tejo and Bacia do Tejo-Sado/Margem Esquerda aquifers. 4p DHA/NRE

Relatório de Estágio do Mestrado em Ensino de Geografia no 3º ciclo do Ensino Básico e no Ensino Secundário apresentado à Faculdade de Letras O presente relatório de estágio visa apresentar uma análise e reflexão das atividades letivas e extralectivas ao longo do Estágio Pedagógico Supervisionado, desenvolvido na Escola Secundária Dr.ª Maria Cândida, em Mira, durante o ano letivo 2020/2021. Além disso, pretendo efetuar uma reflexão da aplicação da estratégia didático-pedagógica, neste caso concreto a Aplicação dos Media na Educação Geográfica e Ambiental, caso específico do Jornal aplicado ao tema das Alterações Climáticas. O relatório está dividido em três partes. A primeira parte, onde é feita a descrição geral da escola, acompanhado do enquadramento geográfico, turma, núcleo de estágio e das atividades realizadas ao longo do estágio. A segunda parte, está direcionada para a reflexão teórica e científica associada ao tema da aplicação didática.O tema da componente científica é as Alterações Climáticas e os seus impactos na saúde humana, assim como o surgimento ou ressurgimento de doenças parasitárias na Europa. Na terceira parte é apresentada a estratégia didática, o jornal realizado pelos alunos, acompanhado dos resultados obtidos ao inquérito realizado aos professores do agrupamento e aos alunos sobre o mesmo. Neste capítulo também se encontra uma reflexão sobre o ensino à distância e os impactos na aprendizagem tanto nos professores como alunos. Os objetivos propostos para esta estratégia foram positivos, uma vez que obtive o feedback desejado por parte dos alunos, assim como toda a dedicação na construção do jornal. This internship report aims to present an analysis and reflection of teaching and extralegal activities throughout the Supervised Pedagogical Internship, developed in Escola Secundária Dr. ª Maria Cândida, in Mira, during the school year 2020/2021. In addition, I intend to reflect on the application of didactic-pedagogical strategy, in this specific case the Application of Media in Geographic and Environmental Education, the specific case of the newspaper applied to the theme of Climate Change.The report is divided in three parts. The first part, where the general description of the school is made, accompanied by the geographic framing, class, internship nucleus and the activities carried out throughout the internship. The second part is directed towards the theoretical and scientific reflection associated with the theme of didactic application. The theme of the scientific component is Climate Change and its impacts on human health, as well as the emergence or resurgence of parasitic diseases in Europe.In the third part, the didactic strategy is presented, the newspaper made by the students, accompanied by the results obtained from the survey carried out to the teachers of the grouping and to the students about it. In this chapter there is also a reflection on distance learning and the impacts on learning for both teachers and students. The objectives proposed for this strategy were positive, since I obtained the desired feedback from the students, as well as all the dedication in the construction of the newspaper.

With the advances of climate change, it is expected harmful consequences to olive tree (Olea europaea L.). Therefore, it is necessary to develop cost-effective practices to reduce the vulnerability of olive crops to the adverse impacts of environmental stresses. Rainfed olive trees were sprayed with zeolites, natural crystalline aluminosilicates, and its effects on photosynthetic activity, phenolic composition, antioxidant activity, leaf minerais concentrations, plant growth, yield, and olive oil quality were assessed. Zeolites application enhanced photosynthetic activity, as well the concentrations of N, Mg, Cu, Zn and Mn in leaves, and changed the secondary metabolism, with decrease oftotal phenols, ortho-diphenols and total antioxidant activity, signs of lower oxidative stress. As consequence, zeolites boosted plant growth, crop yield, and size and weight of fruits. The foliar spray did not significantly affect the oil quality indices free acidity, peroxide value and Km and K270 coefficients. This study strongly suggests that folial' zeolites might be an effective strategy to mitigate the adverse environmental conditions. This research was funded by the Foundation for Science and Technology (FCT, Portugal) and FEDER under Programme PT2020 for financiai support to ClTAB (UIDB/04033/2020), and the Operational Group "Novas práticas em olivais de sequeiro: estratégias de mitigação e adaptação às alterações climáticas" I funded by PT2020 and EAFRD (European Agricultural Fund for Rural Development). Sandra Martins acknowledges the financiai support provided by the FCT-Portuguese Foundation for Science and Technology (PD/BD/135327/2017), under the Doctoral programme "Agricultural Production Chains-from fork to farm". info:eu-repo/semantics/publishedVersion

Objetivou-se analisar os efeitos das externalidades negativas no meio ambiente, abordar o Teorema de Coase no que se refere ao problema de definição dos direitos de propriedade. Adicionalmente, o trabalho explica a teoria econômica da externalidade e ilustra com exemplos. Descreve o comportamento econômico da externalidade na produção agropecuária e mostra de que modo ela cria ineficiência de mercado. Posteriormente, são avaliadas algumas medidas compensatórias para corrigir essas ineficiências. Nesse sentido, argumenta-se em favor da preservação ambiental como requisito básico da manutenção do desenvolvimento agrícola sustentado. Infere-se que modernização da agricultura brasileira teve importância fundamental para o crescimento econômico do País, apesar de que a prioridade dada ao aumento de produtividade pode ter motivado desequilíbrios no meio ambiente.----------------------The objective was to examine the effects of negative externalities in the environment, address the Coase theorem, as regards the problem of definition of property rights. Additionally, the work explains the economic theory of externalities and illustrated with examples. It describes the behavior of economic externalities in production agriculture and shows in what way it creates inefficiency of the market. Subsequently, are evaluated some compensatory measures to correct these inefficiencies. Therefore, it is argued in favor of environmental preservation as a basic requirement of maintaining the sustained agricultural development. It follows that modernization of Brazilian agriculture has fundamental importance for the economic growth of the country, despite the fact that the priority given to increasing productivity may have motivated imbalances in the environment.

This paper analyzes the production diversity among Brazilian agricultural family farms, using the DAP (declaration of Pronaf entitlement). The diversity is measured with a Simpson index, that goes from zero, for monocultures, to one. Production is considerably diversified in these types of farms. 57% of them have a diversification index above 0,35, although it has been noticed an increase in specialization in recent years. The share of monoculture farms rose from 25% in 2012 to 33% in 2014. The diversification index is set as the dependent variable on a Tobit regression with variables that are commonly used to explain the decision to diversify, such as regional dummies, farm size, number of farms, farmer's age, income from social benefits, education, gross production, or a dummy for access to technical assistance. All of these variables have significant effects on production diversity. The results suggest a strong regional bias in terms of diversification, as well as the importance of technical assistance and the availability of technologies in order to spur diversification among family farmers.

The major objective of this chapter is to analyse and briefly describe the evolution of Portuguese agriculture in the context of the European Agriculture. It is not a comprehensive analysis. It is a sketch of its major changes due to major aspects that had influenced in particular the Common Agricultural Policy, and how has evolved with respect to changes in CAP orientation and reforms. This analysis provides an example that might be useful to understand what can be done in the future both in Portugal as in other countries In some aspects figures about these countries including Poland will be presented to benchmark the analysis. Besides this introduction, the chapter has five additional sections. In the next section, background on the Portuguese agriculture and policy before accession is provided. Then, in the third, socio-economic structural characteristics of Portuguese agriculture and their evolution for the last four decades are briefly presented. In the fourth section analysis turns read and understand the evolution as major implications of changes in agricultural policy from CAP reforms. In the fifth section we turn to aspects that are the focus of post-2013 CAP reform and 14 relate them to Portuguese status. Finally, as a conclusion, we look for CAP and the sustainable orientations for Portuguese farmers.

This document aims to provide information about the actions planned with the students within the SAL - Environmental Seed project, as well as to support its preparation. SAL - Seed Environment is a pilot project to raise environmental awareness and promote changes in food consumption among the population. These objectives will be achieved by sharing knowledge about the importance of more sustainable production and consumption practices in the school community. Through information, awareness, training and active participation, from the place of production to the place of consumption, the aim is to encourage more informed choices and, consequently, promote changes in consumption habits and more sustainable behaviour.