Spatiotemporal variations in deep soil moisture and its response to land-use shifts in the Wind-Water Erosion Crisscross Region in the Critical Zone of the Loess Plateau (2011-2015), China

被引：29

作者：

Tong, Yongping ^{[1
,4
]}

Wang, Yunqiang ^{[1
,2
,3
,5
]}

Song, Yi ^{[1
,2
]}

Sun, Hui ^{[1
,6
]}

Xu, Yuting ^{[1
,6
]}

机构：

[1] Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China

[2] CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China

[3] Beijing Normal Univ, Interdisciplinary Res Ctr Earth Sci Frontier, Beijing 100875, Peoples R China

[4] Grad Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[5] Xi An Jiao Tong Univ, Dept Earth & Environm Sci, Xian 710049, Peoples R China

[6] Xian Inst Innovat Earth Environm Res, Xian 710061, Peoples R China

来源：

CATENA | 2020年 / 193卷

基金：

中国国家自然科学基金;

关键词：

Deep soil profile; Earth critical zone; Hydrus-1D; Land-use management; Root distribution; Soil water simulation; TEMPORAL STABILITY; VERTICAL-DISTRIBUTION; VEGETATION TYPES; VARIABILITY; DYNAMICS; ENVIRONMENTS; RESTORATION; PROFILES; RAINFALL; PATTERN;

D O I：

10.1016/j.catena.2020.104643

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Soil water content (SWC) with a deep profile is crucial to land use management, soil and water conservation, and ecological restoration worldwide, including the wind-water erosion crisscross region in the Critical Zone of the Chinese Loess Plateau. To ascertain the spatiotemporal variation of deep SWC and its response to land-use shifts in the region, the SWC was monitored at four representative land uses (farmland, shrubland, natural grassland, and planted grassland) to a depth of 21 m. Monitoring occurred between 2011 and 2015 in the Liudaogou watershed of the Chinese Loess Plateau. The Hydrus-1D model was then applied to simulate the SWC dynamics for the different land-use types and scenarios of land-use shifts. The SWC exhibited a high spatial variability in the vertical direction both within a given soil profile and among the different land uses. In the 0-2 m layer, the soil texture and root biomass controlled the spatial-temporal variability of the SWC. The temporal variability was also controlled by meteorological factors. In the 2-21 m layer, spatial variability was controlled by the soil texture, while soil texture and root biomass influenced the temporal variability of the SWC. The Hydrus-1D model accurately simulated spatiotemporal variations of SWC in the 0-21 m layer and was more effective on layers minimally influenced by weather. Land-use shifts from farmland with shallow-rooted plants to those with deep-rooted plants intensified soil water consumption in the 3.5-5 m layer. For best-management practices, appropriate plant species should be considered based on climatic conditions and SWC regimes. A better understanding of this information is useful for plant species selection, soil water resource utilization, and land use policymaking in the wind-water erosion crisscross region of the Critical Zone and other similar regions around the world.

引用

页数：14