干旱区生态环境知识资源中心(Arid): Spatial variation of correlations between vertical soil water and evapotranspiration and their controlling factors in a semi-arid region

Arid

DOI	10.1016/j.jhydrol.2019.04.023
	Spatial variation of correlations between vertical soil water and evapotranspiration and their controlling factors in a semi-arid region
	Yinglan, A.1; Wang, Guoqiang 1; Liu, Tingxi 2; Xue, Baolin 1; Kuczera, George 3
通讯作者	Wang, Guoqiang ; Xue, Baolin
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2019
卷号	574 页码:53-63
英文摘要	A decrease in soil water content (SWC) has been observed at the global scale and has led to a reduction in evapotranspiration (ET). However, the trend in SWC in eastern Asia differed from the global trend, and this may be due to the overlapping of warm/wet seasons. Because of the limitation of deep soil water content data, especially in drylands, changes in SWC and the correlation between SWC (particularly deep SWC) and ET remain poorly understood. In this study, spatial distribution of correlation coefficient (r) between SWC and ET were calculated based on reanalysis data and remote sensing data, which were validated by in situ data (2004-2005) and sampling data (2016-2017). Firstly, the correlation between SWC and ET decreased with soil depth. The depth of the sharp decrease was 10 cm based on in situ monitoring data (2005-2008) and spatial sampling data (2016-2017). Secondly, the spatial correlation between SWC and ET varied with different vegetation cover types. The correlation increased from the western typical steppe to the eastern forest. The highest values of r were in a forest-covered area, because it had the highest water uptake capacity. However, the difference between r_10 and r_100 (D_r) showed a different spatial pattern, and the lowest negative D_r value was obtained from a forest-grass transition zone in which the enhanced vegetation index showed a significant increasing trend. The significant negative regression determination coefficient (R-2 = 0.9, p < 0.01) between B_(EVI) (0-0.1) and D_r indicated that the narrowed D_r in the transition zone was due to the vegetation increase. This meant that more deep soil water was taken up into the atmosphere. Thus, the deep SWC could become unstable and deep soil could become drier, which would be unsustainable for the ecosystem.
英文关键词	Soil water content (SWC) Vertical depth Vegetation Evapotranspiration (ET) Correlation
类型	Article
语种	英语
国家	Peoples R China ; Australia
收录类别	SCI-E
WOS记录号	WOS:000476962800006
WOS关键词	LOESS PLATEAU ; SHRUB ENCROACHMENT ; VEGETATION ; ECOSYSTEM ; CLIMATE ; PATTERNS ; GRASSLAND ; MOISTURE ; STORAGE ; CONSEQUENCES
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217154
作者单位	1.Beijing Normal Univ, Coll Water Sci, Beijing Key Lab Urban Hydrol Cycle & Sponge City, Xinjiekouwai St 19, Beijing 100875, Peoples R China; 2.Inner Mongolia Agr Univ, Coll Water Conservancy & Civil Engn, Hohhot 010018, Inner Mongolia, Peoples R China; 3.Univ Newcastle, Sch Engn, Callaghan, NSW 2308, Australia
推荐引用方式 GB/T 7714	Yinglan, A.,Wang, Guoqiang,Liu, Tingxi,et al. Spatial variation of correlations between vertical soil water and evapotranspiration and their controlling factors in a semi-arid region[J]. 北京师范大学,2019,574:53-63.
APA	Yinglan, A.,Wang, Guoqiang,Liu, Tingxi,Xue, Baolin,&Kuczera, George.(2019).Spatial variation of correlations between vertical soil water and evapotranspiration and their controlling factors in a semi-arid region.JOURNAL OF HYDROLOGY,574,53-63.
MLA	Yinglan, A.,et al."Spatial variation of correlations between vertical soil water and evapotranspiration and their controlling factors in a semi-arid region".JOURNAL OF HYDROLOGY 574(2019):53-63.