Maximum carbon uptake rate dominates the interannual variability of global net ecosystem exchange

doi:10.1111/gcb.14731

	Maximum carbon uptake rate dominates the interannual variability of global net ecosystem exchange
	Fu, Zheng 1,2; Stoy, Paul C.3; Poulter, Benjamin 4; Gerken, Tobias 5; Zhang, Zhen 6; Wakbulcho, Guta 3; Niu, Shuli 1,2
刊名	GLOBAL CHANGE BIOLOGY
	2019-07-11
页码	14
关键词	carbon uptake period interannual variability maximum carbon uptake rate net ecosystem exchange phenology physiology
ISSN号	1354-1013
DOI	10.1111/gcb.14731
通讯作者	Niu, Shuli(sniu@igsnrr.ac.cn)
英文摘要	Terrestrial ecosystems contribute most of the interannual variability (IAV) in atmospheric carbon dioxide (CO2) concentrations, but processes driving the IAV of net ecosystem CO2 exchange (NEE) remain elusive. For a predictive understanding of the global C cycle, it is imperative to identify indicators associated with ecological processes that determine the IAV of NEE. Here, we decompose the annual NEE of global terrestrial ecosystems into their phenological and physiological components, namely maximum carbon uptake (MCU) and release (MCR), the carbon uptake period (CUP), and two parameters, alpha and beta, that describe the ratio between actual versus hypothetical maximum C sink and source, respectively. Using long-term observed NEE from 66 eddy covariance sites and global products derived from FLUXNET observations, we found that the IAV of NEE is determined predominately by MCU at the global scale, which explains 48% of the IAV of NEE on average while alpha, CUP, beta, and MCR explain 14%, 25%, 2%, and 8%, respectively. These patterns differ in water-limited ecosystems versus temperature- and radiation-limited ecosystems; 31% of the IAV of NEE is determined by the IAV of CUP in water-limited ecosystems, and 60% of the IAV of NEE is determined by the IAV of MCU in temperature- and radiation-limited ecosystems. The Lund-Potsdam-Jena (LPJ) model and the Multi-scale Synthesis and Terrestrial Model Inter-comparison Project (MsTMIP) models underestimate the contribution of MCU to the IAV of NEE by about 18% on average, and overestimate the contribution of CUP by about 25%. This study provides a new perspective on the proximate causes of the IAV of NEE, which suggest that capturing the variability of MCU is critical for modeling the IAV of NEE across most of the global land surface.
资助项目	National Key R&D Program of China[2018YFA0606102] ; National Natural Science Foundation of China[31625006] ; Chinese Academy of Sciences[131A11KYSB20180010] ; Gordon and Betty Moore Foundation[GBMF5439] ; NASA Terrestrial Ecology Program ; National Science Foundation[DEB 1552976] ; National Science Foundation[OIA 1632810] ; National Science Foundation[EF 1702029] ; USDA-NIFA[228396]
WOS关键词	GROSS PRIMARY PRODUCTIVITY ; MODEL INTERCOMPARISON PROJECT ; PROGRAM MULTISCALE SYNTHESIS ; PLANT PHENOLOGY ; SEMIARID ECOSYSTEMS ; CO2 ; CLIMATE ; FLUXES ; FOREST ; RESPIRATION
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
语种	英语
出版者	WILEY
WOS记录号	WOS:000474873300001
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Gordon and Betty Moore Foundation ; NASA Terrestrial Ecology Program ; National Science Foundation ; USDA-NIFA
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/58539]
专题	中国科学院地理科学与资源研究所
通讯作者	Niu, Shuli
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Montana State Univ, Dept Land Resources & Environm Sci, Bozeman, MT 59717 USA 4.NASA, Biospher Sci Lab, Goddard Space Flight Ctr, Greenbelt, MD USA 5.Penn State Univ, Dept Meteorol & Atmospher Sci, University Pk, PA 16802 USA 6.Univ Maryland, Dept Geog Sci, College Pk, MD 20742 USA
推荐引用方式 GB/T 7714	Fu, Zheng,Stoy, Paul C.,Poulter, Benjamin,et al. Maximum carbon uptake rate dominates the interannual variability of global net ecosystem exchange[J]. GLOBAL CHANGE BIOLOGY,2019:14.
APA	Fu, Zheng.,Stoy, Paul C..,Poulter, Benjamin.,Gerken, Tobias.,Zhang, Zhen.,...&Niu, Shuli.(2019).Maximum carbon uptake rate dominates the interannual variability of global net ecosystem exchange.GLOBAL CHANGE BIOLOGY,14.
MLA	Fu, Zheng,et al."Maximum carbon uptake rate dominates the interannual variability of global net ecosystem exchange".GLOBAL CHANGE BIOLOGY (2019):14.