干旱区生态环境知识资源中心(Arid): Increased carbon uptake and water use efficiency in global semi-arid ecosystems

Arid

DOI	10.1088/1748-9326/ab68ec
	Increased carbon uptake and water use efficiency in global semi-arid ecosystems
	Zhang, Li 1,2; Xiao, Jingfeng 3; Zheng, Yi 1; Li, Sinan 1; Zhou, Yu 1
通讯作者	Zhang, Li
来源期刊	ENVIRONMENTAL RESEARCH LETTERS
ISSN	1748-9326
出版年	2020
卷号	15 期号:3
英文摘要	The semi-arid ecosystems dominate the inter-annual variability of the global carbon sink and the driving role of semi-arid ecosystems is becoming increasingly important. However, the impacts of climate change on the dynamics of carbon and water fluxes in global semi-arid ecosystems are still not well understood. We used a data-driven (or machine learning) approach, along with observations from a number of FLUXNET sites and spatially continuous satellite and meteorological data, to generate gridded carbon and water flux estimates for semi-arid regions globally, and then examined the magnitude, spatial patterns, and trends of carbon and water fluxes and their responses to climate change during the period 1982-2015. The average annual gross primary productivity (GPP), net ecosystem productivity (NEP), evapotranspiration (ET), and water use efficiency (WUE) were 628.6 g Cm-2 yr(-1), 9.6 g Cm-2 yr(-1), 463.1 mm yr(-1), and 1.60 g CK g(-1) H2O, respectively. The climate conditions during the period 1982-2015 enhanced gross and net carbon uptake in global semi-arid regions. The spatially-averaged annual GPP, NEP, ET, and WUE in semi-arid regions showed significant increases both globally and regionally (Asia, Africa, and Australia). As with GPP and ET, WUE significantly increased in North America, Asia, Africa, and Australia. Australia was the most sensitive semi-arid region in terms of changes in carbon and water fluxes and their responses to climate. Semi-arid forests, shrublands, and savannas were net carbon sinks; croplands were minor carbon sources; grasslands were nearly carbon neutral. Overall, precipitation was the most important climate factor influencing the carbon and water fluxes; WUE in 40.9% of the semi-arid region was significantly influenced by precipitation. The global climate change is expected to influence global semi-arid ecosystems in many ways and our findings have implications for semi-arid ecosystem management and policy making.
英文关键词	carbon sink evapotranspiration gross primary production interannual variability net ecosystem production semi-arid regions machine learning
类型	Article
语种	英语
国家	Peoples R China ; USA
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000537407300002
WOS关键词	GROSS PRIMARY PRODUCTIVITY ; CLIMATE-CHANGE ; INTERANNUAL VARIABILITY ; SAVANNA PRODUCTIVITY ; VEGETATION ; FLUXES ; RAINFALL ; CO2 ; GRASSLANDS ; RESPONSES
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/318887
作者单位	1.Chinese Acad Sci, Aerosp Informat Res Inst, Key Lab Digital Earth Sci, Beijing 100094, Peoples R China; 2.Key Lab Earth Observat Hainan Prov, Sanya 572029, Peoples R China; 3.Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA
推荐引用方式 GB/T 7714	Zhang, Li,Xiao, Jingfeng,Zheng, Yi,et al. Increased carbon uptake and water use efficiency in global semi-arid ecosystems[J],2020,15(3).
APA	Zhang, Li,Xiao, Jingfeng,Zheng, Yi,Li, Sinan,&Zhou, Yu.(2020).Increased carbon uptake and water use efficiency in global semi-arid ecosystems.ENVIRONMENTAL RESEARCH LETTERS,15(3).
MLA	Zhang, Li,et al."Increased carbon uptake and water use efficiency in global semi-arid ecosystems".ENVIRONMENTAL RESEARCH LETTERS 15.3(2020).