Title: Thermal Optimality of Net Ecosystem Exchange of Carbon Dioxide and underlying mechanisms
Authors: NIU ShuliLUO YiqiFEI ShenfengCESCATTI AlessandroMATTEUCCI GiorgioMIGLIAVACCA MIRCOSEUFERT Guenther
Citation: NEW PHYTOLOGIST vol. 194 p. 775-783
Publisher: WILEY-BLACKWELL
Publication Year: 2012
JRC N°: JRC61767
ISSN: 0028-646X
URI: www.newphytologist.com
http://publications.jrc.ec.europa.eu/repository/handle/JRC61767
DOI: 10.1111/j.1469-8137.2012.04095.x
Type: Articles in periodicals and books
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 ecosystem–climate change feedbacks. The thermal optimality of NEE has implications for understanding fundamental properties of ecosystems in changing environments and benchmarking global models.
JRC Directorate:Sustainable Resources

Files in This Item:
There are no files associated with this item.


Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.