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

Shuli Niu 1 Yiki Luo 1, 2 Shenfeng Fei 1 Wenping Yuan 3 David Schimel 4 Beverly E. Law 5 Christof Ammann 6 Altaf Arain 7 Almut Arneth 8, 9 Marc Aubinet 10 Alan Barr 11 Jason Beringer 12 Christian Bernhofer 13 T. Andrew Black 14 Nina Buchmann 15 Alessandro Cescatti 16 Jiquan Chen 17 Kenneth Davis 18 Ebba Dellwik 19 Ankur Desai 20 Sophia Etzold 15 Louis François 21 Damiano Gianelle 22 Bert Gielen 23 Allen Goldstein 24 Margriet Groenendijk 25 Lianhong Gu 26 Niall Hanan 27 Carole Helfter 28 Takashi Hirano 29 David Y. Hollinger 30 Mike B. Jones 31 Gerard Kiely 32 Thomas E. Kolb 33 Werner L. Kutsch 34 Peter Lafleur 35 David Lawrence 36 Linghao Li 37 Anders Lindroth 8 Marcy Litvak 38 Denis Loustau 39 Magnus Lund 8 Michal Marek 40 Timothy A. Martin 41 Giorgio Matteucci 42 Mirco Migliavacca 16 Leonardo Montagnani 43 Eddy Moors 44 J. William Munger 45 Asko Noormets 46 Walter Oechel 47 Janusz Olejnik 48 Kyaw, T Paw U 49 Kim Pilegaard 19 Serge Rambal 50 Antonio Raschi 51 Russell L. Scott 52 Günther Seufert 16 Donatella Spano 53 Paul Stoy 54 Mark A. Sutton 30 Andrej Varlagin 55 Timo Vesala 56 Ensheng Weng 1 Georg Wohlfahrt 57 Bai Yang 26 Zhongda Zhang 1 Xuhui Zhou 2
Abstract : 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 ecosystemclimate change feedbacks. The thermal optimality of NEE has implications for understanding fundamental properties of ecosystems in changing environments and benchmarking global models.
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Shuli Niu, Yiki Luo, Shenfeng Fei, Wenping Yuan, David Schimel, et al.. Thermal optimality of net ecosystem exchange of carbon dioxide and underlying mechanisms. New Phytologist, Wiley, 2012, 194 (3), pp.775-783. ⟨10.1111/j.1469-8137.2012.04095.x⟩. ⟨hal-02644590⟩

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