干旱区生态环境知识资源中心(Arid): Spatial variability of soil water content and related factors across the Hexi Corridor of China

Arid

DOI	10.1007/s40333-018-0123-x
	Spatial variability of soil water content and related factors across the Hexi Corridor of China
	Li Xiangdong 1,2; Shao Ming’an 1,2,3; Zhao Chunlei 3; Jia Xiaoxu 2,3
通讯作者	Shao Ming’an
来源期刊	JOURNAL OF ARID LAND
ISSN	1674-6767
EISSN	2194-7783
出版年	2019
卷号	11 期号:1 页码:123-134
英文摘要	Soil water content (SWC) is a key factor limiting ecosystem sustainability in arid and semi-arid areas of the Hexi Corridor of China, which is characterized by an ecological environment that is vulnerable to climate change. However, there is a knowledge gap regarding the large-scale spatial distribution of SWC in this region. The specific objectives of this study were to determine the spatial distribution patterns of SWC across the Hexi Corridor and identify the factors responsible for spatial variation of SWC at a regional scale. This study collected and analyzed SWC in the 0-100 cm soil profile from 109 field sampling sites (farmland, grassland and forestland) across the Hexi Corridor in 2017. We selected 17 factors, including land use, topography (latitude, longitude, elevation, slope gradient, and slope aspect), soil properties (soil clay content, soil silt content, soil bulk density, saturated hydraulic conductivity, field capacity, and soil organic carbon content), climate factors (mean annual precipitation, potential evaporation, and aridity index), plant characteristic (vegetation coverage) and planting pattern (irrigation or rain-fed), as possible environmental variables to analyze their effects on SWC. The results showed that SWC was 0.083 (+/- 0.067) g/g in the 0-100 cm soil profile and decreased in the order of farmland, grassland and forestland. The SWC in the upper soil layers (0-20, 20-40 and 40-60 cm) had obvious difference when the mean annual precipitation differed by 200 mm. The SWC decreased from southeast to northwest following the same pattern as precipitation, and had a moderate to strong spatial dependence in a large effective range (75-378 km). The SWC showed a similar distribution and had no significant difference between soil layers in the 0-100 cm soil profile. The principal component analysis showed that the mean annual precipitation, geographical position (longitude and latitude) and soil properties (soil bulk density and soil clay content) were the main factors dominating the variance of environmental variables. A stepwise linear regression equation showed that plant characteristic (vegetation coverage) and soil properties (soil organic carbon content, field capacity and soil clay content) were the optimal factors to predict the variation of SWC. Soil clay content could be better to explain the SWC variation in the deeper soil layers compared with the other factors.
英文关键词	soil water content spatial variability geostatistical analysis soil clay content Hexi Corridor
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000458965000011
WOS关键词	ENTIRE LOESS PLATEAU ; ARID REGION ; LAND-USE ; MOISTURE ; DYNAMICS ; LAYERS ; TRANSPIRATION ; AFFORESTATION ; AVAILABILITY ; IRRIGATION
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
来源机构	中国科学院地理科学与资源研究所 ; 西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216772
作者单位	1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China; 2.Univ Chinese Acad Sci, Coll Nat Resources & Environm, Beijing 100190, Peoples R China; 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Li Xiangdong,Shao Ming’an,Zhao Chunlei,et al. Spatial variability of soil water content and related factors across the Hexi Corridor of China[J]. 中国科学院地理科学与资源研究所, 西北农林科技大学,2019,11(1):123-134.
APA	Li Xiangdong,Shao Ming’an,Zhao Chunlei,&Jia Xiaoxu.(2019).Spatial variability of soil water content and related factors across the Hexi Corridor of China.JOURNAL OF ARID LAND,11(1),123-134.
MLA	Li Xiangdong,et al."Spatial variability of soil water content and related factors across the Hexi Corridor of China".JOURNAL OF ARID LAND 11.1(2019):123-134.