干旱区生态环境知识资源中心(Arid): Diagnosing environmental controls on actual evapotranspiration and evaporative fraction in a water-limited region from northwest China

Arid

DOI	10.1016/j.jhydrol.2019.124045
	Diagnosing environmental controls on actual evapotranspiration and evaporative fraction in a water-limited region from northwest China
	Liu, Qin 1; Wang, Tiejun 1,2; Han, Qiong 1; Sun, Shaobo 1; Liu, Cong-qiang 1; Chen, Xi1,2
通讯作者	Wang, Tiejun
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2019
卷号	578
英文摘要	The knowledge of the impacts of environmental factors on actual evapotranspiration (ETa) and evaporative fraction (EF) is important for understanding a range of land surface processes and for estimating ETa. However, rare attempts have been made to quantitatively assess various controls on ETa and EF. To this end, a comprehensive dataset was obtained from four study sites with different land cover conditions within an arid region from northwest China. The boosted regression tree (BRT) method was applied to assess the relative controls of different factors (e.g., net radiation-R-n, soil water content-SWC, leaf area index-LAI, relative humidity-RH, air temperature-T-a, and wind speed-WS) on ETa and EF. In general, the importance of SWC in controlling ETa increased with decreasing SWC across the sites; however, the BRT analysis revealed that although an arid climate was prevalent in the study region, R-n might outweigh SWC in affecting ETa at both irrigated and rain-fed sites. In addition, RH also played a nonnegligible role in affecting ETa at rain-fed sites, while the relative control of LAI varied with SWC. Moreover, EF at the irrigated site was mainly controlled by LAI and SWC when SWC was low, while by T-a when SWC was higher; RH was the most important in explaining the variability in EF at the rain-fed sites, which was followed by LAI and SWC. This study underscores the importance of available energy and other environmental factors (e.g., RH and LAI) in modulating ETa and EF in water-limited regions, which has important implications for parameterizing hydrological and land surface models for simulating ETa and for identifying EF regimes more accurately.
英文关键词	Actual evapotranspiration Evaporative fraction Soil water Water-limited environment Boosted regression tree Heihe River Basin
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000497250200025
WOS关键词	ENERGY-BALANCE CLOSURE ; MEAN ANNUAL EVAPOTRANSPIRATION ; TEMPERATE DESERT STEPPE ; HEIHE RIVER-BASIN ; SOIL-MOISTURE ; EDDY-COVARIANCE ; ELEVATION GRADIENT ; INNER-MONGOLIA ; SURFACE ; VEGETATION
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
EI主题词	2019-11-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310637
作者单位	1.Tianjin Univ, Inst Surface Earth Syst Sci, Weijin Rd 92, Tianjin 300072, Peoples R China; 2.Tianjin Univ, Tianjin Key Lab Earth Crit Zone Sci & Sustainable, Weijin Rd 92, Tianjin 300072, Peoples R China
推荐引用方式 GB/T 7714	Liu, Qin,Wang, Tiejun,Han, Qiong,et al. Diagnosing environmental controls on actual evapotranspiration and evaporative fraction in a water-limited region from northwest China[J],2019,578.
APA	Liu, Qin,Wang, Tiejun,Han, Qiong,Sun, Shaobo,Liu, Cong-qiang,&Chen, Xi.(2019).Diagnosing environmental controls on actual evapotranspiration and evaporative fraction in a water-limited region from northwest China.JOURNAL OF HYDROLOGY,578.
MLA	Liu, Qin,et al."Diagnosing environmental controls on actual evapotranspiration and evaporative fraction in a water-limited region from northwest China".JOURNAL OF HYDROLOGY 578(2019).