Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 113, Issue 22, Pages 6224-6229Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1524527113
Keywords
climate change; extreme events; elevated CO2; carbon fluxes; grassland ecosystem
Categories
Funding
- ANR VALIDATE project grant
- AnimalChange project - European Community [266018]
- Ecotron
- European FP7 ExpeER Transnational Access program
- OAD WTZ-programme Austria-France
- FWF Project [P28572-B22]
- Austrian Science Fund (FWF) [P28572] Funding Source: Austrian Science Fund (FWF)
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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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