Article (Scientific journals)
Thermal optimality of net ecosystem exchange of carbon dioxide and underlying mechanisms
Niu, Shuli; Fei, Shenfeng; Yuan, Wenping et al.
2012In New Phytologist, 194, p. 775-783
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Keywords :
climate change; optimum temperature; temperature acclimation; temperature adaptation; thermal optimality
Abstract :
[en] • It is well established that individual organisms can acclimate and adapt to temperature to optimize their functioning. However, thermal optimization of ecosystems, as an assemblage of organisms, has not been examined at broad spatial and temporal scales. • Here, we compiled data from 169 globally distributed sites of eddy covariance and quantified the temperature response functions of net ecosystem exchange (NEE), an ecosystem- level property, to determine whether NEE shows thermal optimality and to explore the underlying mechanisms. • We found that the temperature response of NEE followed a peak curve, with the optimum temperature (corresponding to the maximum magnitude of NEE) being positively correlated with annual mean temperature over years and across sites. Shifts of the optimum temperature of NEE were mostly a result of temperature acclimation of gross primary productivity (upward shift of optimum temperature) rather than changes in the temperature sensitivity of ecosystem respiration. • Ecosystem-level thermal optimality is a newly revealed ecosystem property, presumably reflecting associated evolutionary adaptation of organisms within ecosystems, and has the potential to significantly regulate ecosystem–climate change feedbacks. The thermal optimality of NEE has implications for understanding fundamental properties of ecosystems in changing environments and benchmarking global models.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Niu, Shuli;  University of Oklahoma > Department of Botany and Microbiology
Fei, Shenfeng
Yuan, Wenping
Schimel, David
Ammann, Christof
Arain, Altaf
Arneth, Almut
Aubinet, Marc ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Physique des bio-systèmes
Barr, Alan
Beringer, Jason
Bernhofer, Christian
Black, T. Andrew
Buchmann, Nina
Cescatti, Alessandro
Chen, Jiquan
Davis, Kenneth J.
Dellwik, Ebba
Desai, Ankur R.
Etzold, Sophia
François, Louis  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Modélisation du climat et des cycles biogéochimiques
Gianelle, Damiano
Gielen, Bert
Goldstein, Allen
Groenendijk, Margriet
Gu, Lianhong
More authors (15 more) Less
Language :
English
Title :
Thermal optimality of net ecosystem exchange of carbon dioxide and underlying mechanisms
Publication date :
2012
Journal title :
New Phytologist
ISSN :
0028-646X
eISSN :
1469-8137
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
194
Pages :
775-783
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 21 May 2012

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