干旱区生态环境知识资源中心(Arid): Variation in ecosystem water use efficiency along a southwest-to-northeast aridity gradient in China

Arid

DOI	10.1016/j.ecolind.2019.105932
	Variation in ecosystem water use efficiency along a southwest-to-northeast aridity gradient in China
	Bai, Yujie 1,2; Zha, Tianshan 1,2; Bourque, Charles P-A 1,3; Jia, Xin 1,2; Ma, Jingyong 1,2; Liu, Peng 1,2; Yang, Ruizhi 1,2; Li, Cheng 1,2; Du, Tao 1; Wu, Yajuan 1,2
通讯作者	Zha, Tianshan
来源期刊	ECOLOGICAL INDICATORS
ISSN	1470-160X
EISSN	1872-7034
出版年	2020
卷号	110
英文摘要	Quantifying ecosystem water use efficiency (WUE), its spatial variation along an aridity gradient, and its control in response to drought are crucial to understanding regional eco-physiological processes of heterogeneous landscapes. This study examined the magnitude, large-scale spatial patterns in WUE, and underlying drivers by examining published data from 31 eddy-covariance (EC) towers and remote sensing based assessments of normalized difference vegetation index (NDVI) along a southwest-to-northeast aridity gradient in China. Average growing-season WUE at the 31 sites was 1.67 +/- 0.98 g C kg(-1) H2O. Water use efficiencies among vegetation types were significantly higher for cropland and forest, and lower for shrubland and grassland ecosystems (all p-values < 0.01). Together, meteoric water and elevation explained 73% of the cross-gradient variation in WUE. Water use efficiency was shown to increase in direct association with increasing precipitation (PPT) and indirectly through PPT's effect on NDVI. Among ecosystem types, WUE for cropland was most sensitive to PPT and NDVI, whereas shrubland WUE was the least sensitive to these factors. Water use efficiency in the semi-arid zone was more sensitive to the PPT and NDVI, unlike the other climatic zones. Although growing-season PPT was important to WUE for the drier parts of China, it was less important for the dry sub-humid, moderately wetter parts of the country. The present findings showed WUE in dryland ecosystems in China to be firmly controlled by PPT. This suggests that future climate change may have differential outcomes on ecosystem carbon and water cycling along an aridity gradient, leading to the observed cross-gradient differences in ecosystem WUE's.
英文关键词	Eddy covariance Biospheric fluxes Precipitation Spatial variation NDVI Water use efficiency
类型	Article
语种	英语
国家	Peoples R China ; Canada
收录类别	SCI-E
WOS记录号	WOS:000507381800082
WOS关键词	CARBON-DIOXIDE EXCHANGE ; EDDY COVARIANCE ; SPATIOTEMPORAL VARIATIONS ; PRECIPITATION GRADIENT ; INTERANNUAL VARIATIONS ; SPATIAL VARIABILITY ; SEMIARID SHRUBLAND ; ENERGY-EXCHANGE ; VAPOR EXCHANGE ; EVAPOTRANSPIRATION
WOS类目	Biodiversity Conservation ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
来源机构	北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314348
作者单位	1.Beijing Forestry Univ, Sch Soil & Water Conservat, Beijing, Peoples R China; 2.Beijing Forestry Univ, Beijing Engn Res Ctr Soil & Water Conservat, Beijing, Peoples R China; 3.Univ New Brunswick, Fac Forestry & Environm Management, 28 Dineen Dr, Fredericton, NB E3B 5A3, Canada
推荐引用方式 GB/T 7714	Bai, Yujie,Zha, Tianshan,Bourque, Charles P-A,et al. Variation in ecosystem water use efficiency along a southwest-to-northeast aridity gradient in China[J]. 北京林业大学,2020,110.
APA	Bai, Yujie.,Zha, Tianshan.,Bourque, Charles P-A.,Jia, Xin.,Ma, Jingyong.,...&Wu, Yajuan.(2020).Variation in ecosystem water use efficiency along a southwest-to-northeast aridity gradient in China.ECOLOGICAL INDICATORS,110.
MLA	Bai, Yujie,et al."Variation in ecosystem water use efficiency along a southwest-to-northeast aridity gradient in China".ECOLOGICAL INDICATORS 110(2020).