气候变化领域集成服务门户(CCPortal): Evapotranspiration components and water use efficiency from desert to alpine ecosystems in drylands

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DOI	10.1016/j.agrformet.2020.108283
	Evapotranspiration components and water use efficiency from desert to alpine ecosystems in drylands
	Wang, Haibo; Li, Xin; Xiao, Jingfeng; Ma, Mingguo
通讯作者	Li, X (通讯作者)，Chinese Acad Sci, Natl Tibetan Plateau Data Ctr, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China. ; Li, X (通讯作者)，Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China.
发表日期	2021
ISSN	0168-1923
EISSN	1873-2240
卷号	298
英文摘要	Water use efficiency (WUE), the ratio of carbon gain to water loss, is an important physiological indicator in assessing the interactions between the carbon and water cycles. Quantifying the spatiotemporal patterns of WUE at both canopy and ecosystem levels across main dryland ecosystems along climate gradients is vital for water resource management in water-limited regions. However, the patterns of WUE among natural and managed ecosystems in drylands are not well understood. We partitioned the evapotranspiration (ET) components and calculated WUE at both canopy and ecosystem levels across dryland ecosystems in an arid region in Northwest China using observations from a regional flux observation network. Our results showed divergent variations of canopy and ecosystem WUE across the main ecosystems along climate gradients in arid regions. The ecosystem WUE and canopy WUE ranged from 0.7 to 1.8 gC Kg(-1) H2O and from 0.8 to 2.4 gC Kg(-1) H2O, respectively. Climatic gradients were the dominant factors controlling the spatial patterns of WUE across dryland ecosystems. Divergences were also observed between oasis and natural ecosystems because of different environmental conditions and management practices. Climatic regulation of the spatial WUE patterns was dominated by water variability rather than temperature. The higher canopy WUE for desert ecosystems indicated that these ecosystems were adapted to the water-limited environment. The discrepancies of both canopy and ecosystem WUE between croplands in arid and hyper-arid climate zones were caused by the differences in agricultural management techniques for these crops. Human activities (e.g., irrigation and agriculture management) altered the distribution of water resource and water use strategies, which further affected the magnitude and patterns of WUE in drylands. This study provides insights into the spatiotemporal patterns of ET components and both canopy and ecosystem WUE over dryland ecosystems and can inform regional water resources management in water-limited regions.
关键词	HEIHE RIVER-BASIN EDDY-COVARIANCE CARBON-DIOXIDE VEGETATION CONTROL SOIL-MOISTURE FOREST CHINA FLUX TRANSPIRATION BALANCE
英文关键词	Evapotranspiration partitioning; Carbon and water fluxes; Gross ecosystem production; Heihe River Basin; Water availability; Arid and semi-arid regions
语种	英语
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000610797100007
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/255157
作者单位	[Wang, Haibo] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Remote Sensing Gansu Prov, Heihe Remote Sensing Expt Res Stn, Lanzhou 730000, Peoples R China; [Li, Xin] Chinese Acad Sci, Natl Tibetan Plateau Data Ctr, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China; [Li, Xin] Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China; [Xiao, Jingfeng] Univ New Hampshire, Earth Syst Res Ctr, Inst Study Earth Oceans & Space, Durham, NH 03824 USA; [Ma, Mingguo] Southwest Univ, Sch Geog Sci, Minist Educ, Chongqing Jinfo Mt Field Sci Observat & Res Stn K, Chongqing 400715, Peoples R China
推荐引用方式 GB/T 7714	Wang, Haibo,Li, Xin,Xiao, Jingfeng,et al. Evapotranspiration components and water use efficiency from desert to alpine ecosystems in drylands[J]. 中国科学院西北生态环境资源研究院,2021,298.
APA	Wang, Haibo,Li, Xin,Xiao, Jingfeng,&Ma, Mingguo.(2021).Evapotranspiration components and water use efficiency from desert to alpine ecosystems in drylands.AGRICULTURAL AND FOREST METEOROLOGY,298.
MLA	Wang, Haibo,et al."Evapotranspiration components and water use efficiency from desert to alpine ecosystems in drylands".AGRICULTURAL AND FOREST METEOROLOGY 298(2021).