Evapotranspiration and its dominant controls along an elevation gradient in the Qinghai Lake watershed, northeast Qinghai-Tibet Plateau

doi:10.1016/j.jhydrol.2019.05.019

	Evapotranspiration and its dominant controls along an elevation gradient in the Qinghai Lake watershed, northeast Qinghai-Tibet Plateau
	Ma, Yu-Jun 2,3,4; Li, Xiao-Yan 3,4; Liu, Lei 1; Yang, Xiao-Fan 3,4; Wu, Xiu-Chen 3,4; Wang, Pei 3,4; Lin, Henry 5; Zhang, Guang-Hui 3; Miao, Chi-Yuan 3
刊名	JOURNAL OF HYDROLOGY
	2019-08-01
卷号	575 页码:257-268
关键词	Solar radiation Air temperature Soil moisture content Evapotranspiration Qinghai Lake watershed
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2019.05.019
通讯作者	Ma, Yu-Jun(myj3648@163.com)
英文摘要	Evapotranspiration (ET) and its dominant controls show obvious elevational pattern on the Qinghai-Tibet Plateau, due to heterogeneous environmental conditions regulated by altitude. To understand better how and why ET varies at different altitudes in the Qinghai Lake watershed, this study measured and retrieved soil moisture, solar radiation, and ET data between 3300 m and 4700 m, and further investigated the influence of water and energy conditions on ET. Results showed that, the mean annual terrestrial ET was 343 and 360 mm in this watershed in 2014 and 2015, respectively. The higher ET mainly appeared in the midstream of Shaliu River and on the southern region of Qinghai Lake, while the sand land on the east of Qinghai Lake and the bare rock in the northwest of the watershed had the lowest values. The ET increased firstly and then decreased with the increase of altitude, and its peak value appeared at 3600-3700 m. The dominant controls for ET switched from water conditions to energy conditions with the increase of elevation. The maximum limited fraction [(predicted value - actual value)/predicted value x 100] of ET by water condition (soil moisture content) achieved 11.2% and 10.1% at 3300-3350 m in 2014 and 2015, and the corresponding mean area-weighted values were 7.3% and 5.4% at 3300-3650 m, respectively. The maximum limited fraction of ET by energy condition (shortwave radiation and air temperature) achieved 24.4% and 29.8% at 4650-4700 m in 2014 and 2015, and the corresponding mean area-weighted values were 10.8% and 11.9% at 3650-4700 m, respectively. Overall, the energy conditions were more influential factors limiting the ET in the entire watershed, and this conclusion is critical for the management of regional terrestrial ecosystem with future climate change.
资助项目	National Natural Science Foundation of China[NSFC 41730854] ; National Natural Science Foundation of China[41771026] ; National Key Research and Development Program of China[2016YFE0203400-01] ; PCSIRT of China[IRT_15R06] ; State Key Laboratory of Earth Surface Processes and Resource Ecology, China[2017-FX-04]
WOS关键词	SOIL-MOISTURE ; SURFACE-TEMPERATURE ; 3-TEMPERATURE MODEL ; CLIMATE-CHANGE ; ENERGY ; ECOSYSTEMS ; DYNAMICS ; PRECIPITATION ; RESPIRATION ; SENSITIVITY
WOS研究方向	Engineering ; Geology ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000488143000021
资助机构	National Natural Science Foundation of China ; National Key Research and Development Program of China ; PCSIRT of China ; State Key Laboratory of Earth Surface Processes and Resource Ecology, China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/129703]
专题	中国科学院地理科学与资源研究所
通讯作者	Ma, Yu-Jun
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 2.Sun Yat Sen Univ, Sch Geog & Planning, 135 Xingangxi Rd, Guangzhou 510275, Guangdong, Peoples R China 3.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China 4.Beijing Normal Univ, Sch Nat Resources, Fac Geog Sci, Beijing 100875, Peoples R China 5.Penn State Univ, Dept Ecosyst Sci & Management, University Pk, PA 16802 USA
推荐引用方式 GB/T 7714	Ma, Yu-Jun,Li, Xiao-Yan,Liu, Lei,et al. Evapotranspiration and its dominant controls along an elevation gradient in the Qinghai Lake watershed, northeast Qinghai-Tibet Plateau[J]. JOURNAL OF HYDROLOGY,2019,575:257-268.
APA	Ma, Yu-Jun.,Li, Xiao-Yan.,Liu, Lei.,Yang, Xiao-Fan.,Wu, Xiu-Chen.,...&Miao, Chi-Yuan.(2019).Evapotranspiration and its dominant controls along an elevation gradient in the Qinghai Lake watershed, northeast Qinghai-Tibet Plateau.JOURNAL OF HYDROLOGY,575,257-268.
MLA	Ma, Yu-Jun,et al."Evapotranspiration and its dominant controls along an elevation gradient in the Qinghai Lake watershed, northeast Qinghai-Tibet Plateau".JOURNAL OF HYDROLOGY 575(2019):257-268.