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Elevated CO2maintains grassland net carbon uptake under a future heat and drought extreme

Authors: Roy, Jacques; Picon-Cochard, Catherine; Augusti, Angela; Benot, Marie-Lise; Thiery, Lionel; Darsonville, Olivier; Landais, Damien; +10 Authors

Elevated CO2maintains grassland net carbon uptake under a future heat and drought extreme

Abstract

SignificanceEcosystems are responding to climate change and increasing atmospheric CO2concentrations. Interactions between these factors have rarely been assessed experimentally during and after extreme climate events despite their predicted increase in intensity and frequency and their negative impact on primary productivity and soil carbon stocks. Here, we document how a grassland exposed to a forecasted 2050s climate shows a remarkable recovery of ecosystem carbon uptake after a severe drought and heat wave, this recovery being amplified under elevated CO2. Over the growing season, elevated CO2entirely compensated for the negative impact of extreme heat and drought on net carbon uptake. This study highlights the importance of incorporating all interacting factors in the predictions of climate change impacts.

Countries
France, Italy, Italy
Keywords

Hot Temperature, [SDE.MCG]Environmental Sciences/Global Changes, Climate Change, [object Object], 551, Carbon Cycle, Soil, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, environment/Ecosystems, climat extrème, environment/Symbiosis, [SDV.EE.ECO] Life Sciences [q-bio]/Ecology, environment/Ecosystems, Carbon fluxes, Climate change, Grassland ecosystem, Milieux et Changements globaux, changement climatique, flux de carbone, écotron, [SDV.EE.IEO] Life Sciences [q-bio]/Ecology, environment/Symbiosis, Extreme events, Carbon Dioxide, écosystème prairial, Grassland, Carbon, Droughts, [SDE.BE] Environmental Sciences/Biodiversity and Ecology, Plant Leaves, [SDE.MCG] Environmental Sciences/Global Changes, croissance racinaire, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, [SDE]Environmental Sciences, [SDV.EE.IEO]Life Sciences [q-bio]/Ecology, élevation du gaz carbonique, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, environment/Ecosystems, [SDV.EE.IEO]Life Sciences [q-bio]/Ecology, environment/Symbiosis, [object Object

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