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

被引：104

作者：

Roy, Jacques ^{[1
]}

Picon-Cochard, Catherine ^{[2
]}

Augusti, Angela ^{[2
,3
]}

Benot, Marie-Lise ^{[2
,4
]}

Thiery, Lionel ^{[2
]}

Darsonville, Olivier ^{[2
]}

Landais, Damien ^{[1
]}

Piel, Clement ^{[1
]}

Defossez, Marc ^{[1
]}

Devidal, Sebastien ^{[1
]}

Escape, Christophe ^{[1
]}

Ravel, Olivier ^{[1
]}

Fromin, Nathalie ^{[5
]}

Volaire, Florence ^{[5
,6
]}

Milcu, Alexandru ^{[1
,5
]}

Bahn, Michael ^{[7
]}

Soussana, Jean-Francois ^{[2
]}

机构：

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

[2] INRA, Unite Rech 874, Grassland Ecosyst Res, F-63039 Clermont Ferrand, France

[3] CNR, Inst Agroenvironm & Forest Biol, I-205010 Porano, TR, Italy

[4] Univ Bordeaux, INRA, Biodiversite Genes & Communautes, F-33615 Pessac, France

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

[6] INRA, Unite Contrat 1338, Ctr Ecol Fonct & Evolut, F-34293 Montpellier 5, France

[7] Univ Innsbruck, Inst Ecol, A-6020 Innsbruck, Austria

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2016年 / 113卷 / 22期

基金：

奥地利科学基金会;

关键词：

climate change; extreme events; elevated CO2; carbon fluxes; grassland ecosystem; ABOVEGROUND BIOMASS PRODUCTION; ATMOSPHERIC CO2; CLIMATE EXTREMES; WATER RELATIONS; PLANT CARBON; C-4; GRASSES; TEMPERATURE; ECOSYSTEM; SOIL; PRODUCTIVITY;

D O I：

10.1073/pnas.1524527113

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：6224 / 6229

页数：6

共 59 条

[1] Effects of elevated CO2, warming and drought episodes on plant carbon uptake in a temperate heath ecosystem are controlled by soil water status [J].