干旱区生态环境知识资源中心(Arid): Environmental and biological controls on monthly and annual evapotranspiration in China's Loess Plateau

Arid

DOI	10.1007/s00704-018-2701-4
	Environmental and biological controls on monthly and annual evapotranspiration in China's Loess Plateau
	Yang, Zesu 1; Zhang, Qiang2,3,4 ; Hao, Xiaocui 5
通讯作者	Yang, Zesu
来源期刊	THEORETICAL AND APPLIED CLIMATOLOGY
ISSN	0177-798X
EISSN	1434-4483
出版年	2019
卷号	137 期号:3-4 页码:1675-1692
英文摘要	Information about evapotranspiration (ET) is essential for managing water resources, especially in areas with limited water and no irrigation facilities. In this study, based on ET observations made using an eddy covariance system, the variation of ET and its control factors are investigated on monthly and annual scales in the context of China's Loess Plateau. Monthly ET is determined by the reference ET (ET0) and surface conductance (g(s)), where ET0 is an indicator of both the energy available for ET and the atmospheric demand for evaporation and g(s) represents the environmental stress that limits ET. The correlations among volumetric soil water content (SWC), leaf area index (LAI), and monthly ET are weak across all the studied ecosystems. ET shows large inter-annual variability in the Loess Plateau, with a coefficient of inter-annual variation of 19.5%. The environmental variables of ET0, precipitation (P), SWC, LAI, and g(s) also show notable inter-annual variability. P is the original factor forcing the inter-annual variability of ET. LAI and g(s) are important for regulating ET and reduce the correlation between ET and SWC. Different ecosystems use different biological processes to regulate ET under conditions of water stress: for natural vegetation, g(s) responds directly to SWC and surface air vapor pressure (e) and controls ET by regulating transpiration; for cropland, LAI responds directly to SWC and e and determines g(s), thereby regulating ET. The present results suggest that LAI is useful for characterizing the physiological constraints on cropland ET but is not suitable for estimating the ET of semi-arid natural vegetation. Parameterizing g(s) with e could give better estimates of ET for natural vegetation.
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000477054700005
WOS关键词	INTERANNUAL VARIABILITY ; EDDY-COVARIANCE ; ENERGY FLUXES ; RIVER-BASIN ; WATER-VAPOR ; CLIMATE ; BALANCE ; FOREST ; CONDUCTANCE ; STRATEGIES
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/219102
作者单位	1.Chengdu Univ Informat Technol, Coll Atmospher Sci, 24 Block 1,Xuefu Rd, Chengdu 610225, Sichuan, Peoples R China; 2.China Meteorol Adm, Lanzhou 730020, Gansu, Peoples R China; 3.Key Lab Arid Climat Change & Reducing Disaster Ga, Lanzhou 730020, Gansu, Peoples R China; 4.Inst Arid Meteorol, Key Open Lab Arid Climat Change & Disaster Reduct, Lanzhou 730020, Gansu, Peoples R China; 5.Sichuan Acad Environm Sci, Chengdu 610041, Sichuan, Peoples R China
推荐引用方式 GB/T 7714	Yang, Zesu,Zhang, Qiang,Hao, Xiaocui. Environmental and biological controls on monthly and annual evapotranspiration in China's Loess Plateau[J],2019,137(3-4):1675-1692.
APA	Yang, Zesu,Zhang, Qiang,&Hao, Xiaocui.(2019).Environmental and biological controls on monthly and annual evapotranspiration in China's Loess Plateau.THEORETICAL AND APPLIED CLIMATOLOGY,137(3-4),1675-1692.
MLA	Yang, Zesu,et al."Environmental and biological controls on monthly and annual evapotranspiration in China's Loess Plateau".THEORETICAL AND APPLIED CLIMATOLOGY 137.3-4(2019):1675-1692.