干旱区生态环境知识资源中心(Arid): Improvement of evapotranspiration simulation study in the Hailar River basin under the influence of vegetation dynamics

Arid

DOI	10.1016/j.jconhyd.2024.104324
	Improvement of evapotranspiration simulation study in the Hailar River basin under the influence of vegetation dynamics
	Wang, Libo; Yinglan, A.; Wang, Guoqiang; Xue, Baolin
通讯作者	Yinglan, A
来源期刊	JOURNAL OF CONTAMINANT HYDROLOGY
ISSN	0169-7722
EISSN	1873-6009
出版年	2024
卷号	262
英文摘要	In arid and semi-arid areas with <400 mm of precipitation, evapotranspiration (ET) accounts for about 80% of precipitation and is the main water consumer in the watershed. However, vegetation greening in recent years will increase ET and exacerbate the aridity of the area by affecting soil moisture in the root system. Vegetation changes are regional and spatially heterogeneous, therefore, in order to characterize ET changes under vegetation dynamics, it is necessary to expand the spatial scale of ET simulation. However, widely used evapotranspiration simulation models, such as the Shuttleworth-Wallace model (S-W model), are deficient in reflecting the direct and indirect effects of vertical (i.e., soil depths) and horizontal (i.e., vegetation dynamics) directions. Based on field sampling and constructed structural equation model (SEM), we found that vegetation dynamics affect evapotranspiration not only directly, but also indirectly by affecting soil moisture at different depths. On this basis, we defined the weighting coefficients of 0.85 and 0.15 for grassland vegetation zones, 0.3, 0.15, 0.20, 0.25, 0.10 for forest-grass interspersed zones, and 0.20, 0.55, 0.25 for forested zones, respectively, based on the SEM results. Different soil moisture weighting coefficients were defined within different vegetation type zones and the improved S-W model is called S-W-alpha. Comparing the simulation results with the measured data, S-W-alpha improved the ET simulation accuracy in this region by 33.92% and the improved ET spatial trend can respond to the dynamic changes of vegetation. Replacing the ET module in the Block-wise use of TOPMODEL and Muskingum-Cunge method mode (BTOP model) with the modified S-W-alpha, the results show that the simulation accuracy of the improved model is increased by 25%, and the Nash is higher than 75% for both the rate period and the validation period, which realizes the extension of the model from the point scale to the basin scale. The modified model may provide technical support for simulation of evapotranspiration and management of ecosystem health in ecologically fragile areas.
英文关键词	Vegetation dynamics Evapotranspiration S -W model Scale extension Arid and semiarid area
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001206330900001
WOS关键词	POTENTIAL EVAPOTRANSPIRATION ; WATER-USE ; EVAPORATION ; TEMPERATURE ; CLIMATE ; CHINA ; MODEL ; NDVI
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404423
推荐引用方式 GB/T 7714	Wang, Libo,Yinglan, A.,Wang, Guoqiang,et al. Improvement of evapotranspiration simulation study in the Hailar River basin under the influence of vegetation dynamics[J],2024,262.
APA	Wang, Libo,Yinglan, A.,Wang, Guoqiang,&Xue, Baolin.(2024).Improvement of evapotranspiration simulation study in the Hailar River basin under the influence of vegetation dynamics.JOURNAL OF CONTAMINANT HYDROLOGY,262.
MLA	Wang, Libo,et al."Improvement of evapotranspiration simulation study in the Hailar River basin under the influence of vegetation dynamics".JOURNAL OF CONTAMINANT HYDROLOGY 262(2024).