Elevated CO2 maintains grassland net carbon uptake under a future heat and drought extreme

Roy Jacques; Picon-Cochard Catherine; Augusti AngelaBenot Marie-LiseThiery LionelDarsonville OlivierLandais DamienPiel ClementDefossez MarcDevidal SebastienEscape ChristopheRavel OlivierFromin NathalieVolaire FlorenceMilcu AlexandruBahn MichaelSoussana Jean-Francois

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Elevated CO2 maintains grassland net carbon uptake under a future heat and drought extreme

机译：Elevated CO2 maintains grassland net carbon uptake under a future heat and drought extreme

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Extreme climatic events (ECEs) such as droughts and heat waves are predicted to increase in intensity and frequency and impact the terrestrial carbon balance. However, we lack direct experimental evidence of how the net carbon uptake of ecosystems is affected by ECEs under future elevated atmospheric CO2 concentrations (eCO(2)). Taking advantage of an advanced controlled environment facility for ecosystem research (Ecotron), we simulated eCO(2) and extreme cooccurring heat and drought events as projected for the 2050s and analyzed their effects on the ecosystem-level carbon and water fluxes in a C3 grassland. Our results indicate that eCO(2) not only slows down the decline of ecosystem carbon uptake during the ECE but also enhances its recovery after the ECE, as mediated by increases of root growth and plant nitrogen uptake induced by the ECE. These findings indicate that, in the predicted near future climate, eCO(2)d could mitigate the effects of extreme droughts and heat waves on ecosystem net carbon uptake.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2016年第22期|6224-6229|共6页
作者
Roy Jacques; Picon-Cochard Catherine; Augusti AngelaBenot Marie-LiseThiery LionelDarsonville OlivierLandais DamienPiel ClementDefossez MarcDevidal SebastienEscape ChristopheRavel OlivierFromin NathalieVolaire FlorenceMilcu AlexandruBahn MichaelSoussana Jean-Francois;
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作者单位

Univ Montpellier 3, Ecole Prat Hautes Etud, Univ Montpellier, Centre Ecol Fonct & Evolut,CNRS,Unite Mixte Rech, F-34293 Montpellier 5, France;

CNRS, Unite Propre Serv 3248, Ecotron Europeen Montpellier, Campus Baillarguet, F-34980 Montferrier Sur Lez, France;

INRA, Unite Rech 874, Grassland Ecosyst Res, F-63039 Clermont Ferrand, FranceUniv Innsbruck, Inst Ecol, A-6020 Innsbruck, Austria;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
climate change; extreme events; elevated CO2; carbon fluxes; grassland ecosystem;

Elevated CO2 maintains grassland net carbon uptake under a future heat and drought extreme

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