ORBi: Niu Shuli - Thermal optimality of net ecosystem exchange of carbon dioxide and underlying mechanisms

Reference : Thermal optimality of net ecosystem exchange of carbon dioxide and underlying mechanisms


	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Environmental sciences & ecology
	To cite this reference:	http://hdl.handle.net/2268/122856

Title :	Thermal optimality of net ecosystem exchange of carbon dioxide and underlying mechanisms
Language :	English
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 - ULg > 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 - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Modélisation du climat et des cycles biogéochimiques >]
	Gianelle, Damiano [ > > ]
	Gielen, Bert [ > > ]
	Goldstein, Allen [ > > ]
	Groenendijk, Margriet [ > > ]
	Gu, Lianhong [ > > ]
	et al. [ > > ]
Publication date :	2012
Journal title :	New Phytologist
Publisher :	Blackwell Publishing
Volume :	194
Pages :	775-783
Audience :	International
ISSN :	0028-646X
e-ISSN :	1469-8137
City :	Oxford
Country :	United Kingdom
Keywords :	[en] 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.
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/122856

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