干旱区生态环境知识资源中心(Arid): Vertical variations of soil water and its controlling factors based on the structural equation model in a semi-arid grassland

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DOI	10.1016/j.scitotenv.2019.07.181
	Vertical variations of soil water and its controlling factors based on the structural equation model in a semi-arid grassland
	A, Yinglan 1; Wang, Guoqiang 1; Liu, Tingxi 2; Shrestha, Sangam 3; Xue, Baolin 1; Tan, Zhongxin 1
通讯作者	Wang, Guoqiang ; Tan, Zhongxin
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2019
卷号	691 页码:1016-1026
英文摘要	Soil water content (SWC) of a vertical profile plays an important role in the soil-plant-atmosphere continuum system through eco-hydrological process, which was controlled by multiple factors. Previous studies ignored soil water from a systematic perspective because of the lack of suitable methods to deal with interrelated factors. We developed a meta-model based on structural equation model (SEM) to identify the factors contributing to soil water, and the interactions among these factors, in a semi-arid grassland system. The model was based on the hypothesis that soil water is affected by hydrological variables (precipitation: P, evapotranspiration: E and underground water: GW), vegetation (vegetation coverage: VC and above ground biomass: AGB), and soil parameters (soil organic matter: SOM and bulk density: BD). E and AGB decrease soil water content, while VC and SOM help to retain soil water content. The proportion of explained variation in soil water increased with depth due to increasing stability. The most important contributors were AGB (r = -0.15) and VC (r = 0.39), and their contributions were opposite because their mechanisms differed. The accumulation of AGB in the growth season consumed soil water through root uptake. The contribution of AGB increased with depth, inferring that grassland species are xerophytes with deep roots to access soil water during drought. Coverage positively contributed to soil water, but its influence decreased with depth because its main effects (intercepting rainfall and providing shade) were at the surface. This systematic perspective of how hydrological, vegetation, and soil properties affect soilwater will be useful to guide the management of semi-arid grasslands. (c) 2019 Elsevier B.V. All rights reserved.
英文关键词	Vertical soil water Structural equation model Hydrological variables Vegetation variables Soil property variables Semi-arid grassland
类型	Article
语种	英语
国家	Peoples R China ; Thailand
收录类别	SCI-E
WOS记录号	WOS:000504009600096
WOS关键词	TEMPORAL STABILITY ; LOESS PLATEAU ; VEGETATION PATTERNS ; SPECIES RICHNESS ; SURFACE MOISTURE ; ORGANIC-CARBON ; LAND USES ; STORAGE ; VARIABILITY ; DYNAMICS
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
EI主题词	2019-11-15
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/2XILL650/310861
作者单位	1.Beijing Normal Univ, Coll Water Sci, Beijing Key Lab Urban Hydrol Cycle & Sponge City, Beijing 100875, Peoples R China; 2.Inner Mongolia Agr Univ, Coll Water Conservancy & Civil Engn, Hohhot 010018, Inner Mongolia, Peoples R China; 3.Asian Inst Technol, Dept Civil & Infrastruct Engn, Water Engn & Management, Pathum Thani 12120, Thailand
推荐引用方式 GB/T 7714	A, Yinglan,Wang, Guoqiang,Liu, Tingxi,et al. Vertical variations of soil water and its controlling factors based on the structural equation model in a semi-arid grassland[J]. 北京师范大学,2019,691:1016-1026.
APA	A, Yinglan,Wang, Guoqiang,Liu, Tingxi,Shrestha, Sangam,Xue, Baolin,&Tan, Zhongxin.(2019).Vertical variations of soil water and its controlling factors based on the structural equation model in a semi-arid grassland.SCIENCE OF THE TOTAL ENVIRONMENT,691,1016-1026.
MLA	A, Yinglan,et al."Vertical variations of soil water and its controlling factors based on the structural equation model in a semi-arid grassland".SCIENCE OF THE TOTAL ENVIRONMENT 691(2019):1016-1026.