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	Divergent apparent temperature sensitivity of terrestrial ecosystem respiration
	Song B. ; Niu S. L. ; Luo R. S. ; Luo Y. Q. ; Chen J. Q. ; Yu G. R. ; Olejnik J. ; Wohlfahrt G. ; Kiely G. ; Noormets A. ; Montagnani L. ; Cescatti A. ; Magliulo V. ; Law B. E. ; Lund M. ; Varlagin A. ; Raschi A. ; Peichl M. ; Nilsson M. B. ; Merbold L.
	2014
关键词	activation energy ecosystem respiration index of water availability interannual variability gross primary productivity eddy covariance technique forest soil respiration carbon-cycle feedback global convergence dependent q(10) water-vapor dioxide climate model exchange
英文摘要	Aims Recent studies revealed convergent temperature sensitivity of ecosystem respiration (Re) within aquatic ecosystems and between terrestrial and aquatic ecosystems. We do not know yet whether various terrestrial ecosystems have consistent or divergent temperature sensitivity. Here, we synthesized 163 eddy covariance flux sites across the world and examined the global variation of the apparent activation energy (Ea), which characterizes the apparent temperature sensitivity of and its interannual variability (IAV) as well as their controlling factors. Methods We used carbon fluxes and meteorological data across FLUXNET sites to calculate mean annual temperature, temperature range, precipitation, global radiation, potential radiation, gross primary productivity and Re by averaging the daily values over the years in each site. Furthermore, we analyzed the sites with >8 years data to examine the IAV of Ea and calculated the standard deviation of Ea across years at each site to characterize IAV. Important Findings The results showed a widely global variation of Ea, with significantly lower values in the tropical and subtropical areas than in temperate and boreal areas, and significantly higher values in grasslands and wetlands than that in deciduous broadleaf forests and evergreen forests. Globally, spatial variations of Ea were explained by changes in temperature and an index of water availability with differing contribution of each explaining variable among climate zones and biomes. IAV and the corresponding coefficient of variation of Ea decreased with increasing latitude, but increased with radiation and corresponding mean annual temperature. The revealed patterns in the spatial and temporal variations of Ea and its controlling factors indicate divergent temperature sensitivity of R-e, which could help to improve our predictive understanding of R-e in response to climate change.
出处	Journal of Plant Ecology
卷	7
期	5
页	419-428
收录类别	SCI
语种	英语
ISSN号	1752-9921
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/29611]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Song B.,Niu S. L.,Luo R. S.,et al. Divergent apparent temperature sensitivity of terrestrial ecosystem respiration. 2014.

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