ROY, Jacques; PICON-COCHARD, Catherine; AUGUSTI, Angela; BENOT, Marie-Lise; THIERY, Lionel; DARSONVILLE, Olivier; LANDAIS, Damien; PIEL, Clément; DEFOSSEZ, Marc; DEVIDAL, Sebastien; ESCAPE, Christophe; RAVEL, Olivier; FROMIN, Nathalie; VOLAIRE, Florence; MILCU, Alexandru; BAHN, Michael; SOUSSANA, Jean-François

doi:10.1073/pnas.1524527113

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http://creativecommons.org/licenses/by-nc/

ROY, Jacques
Écotron Européen de Montpellier

PICON-COCHARD, Catherine
Unité de recherche sur l'Ecosystème Prairial [UREP]

AUGUSTI, Angela
Unité de recherche sur l'Ecosystème Prairial [UREP]

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Article de revue

Ce document a été publié dans

Proceedings of the National Academy of Sciences of the United States of America. 2016-05-31, vol. 113, n° 22, p. 6224-6229

National Academy of Sciences

Résumé en anglais

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 (eCO2). Taking advantage of an advanced controlled environment facility for ecosystem research (Ecotron), we simulated eCO2 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 eCO2 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, eCO2 could mitigate the effects of extreme droughts and heat waves on ecosystem net carbon uptake.< Réduire

DOI

http://dx.doi.org/10.1073/pnas.1524527113

Projet Européen

AN Integration of Mitigation and Adaptation options for sustainable Livestock production under climate CHANGE
Distributed Infrastructure for EXPErimentation in Ecosystem Research

Project ANR

Vulnérabilité des prairies et des élevages au changement climatique et aux événements extrêmes. - ANR-07-VULN-0011
ANAEE-Services - ANR-11-INBS-0001

Origine

Importé de hal

Unités de recherche

BioGeCo (Biodiversité Gènes & Communautés) - UMR 1202