Response of deep soil drought to precipitation, land use and topography across a semiarid watershed

doi:10.1016/j.agrformet.2019.107866

IEECAS OpenIR > 生态环境研究室

	Response of deep soil drought to precipitation, land use and topography across a semiarid watershed
	Wang, Yunqiang 1,2,6; Shao, Ming'an 3; Sun, Hui 1; Fu, Zihuan 1; Fan, Jun 4; Hu, Wei 5; Fang, Linchuan 4
通讯作者	Wang, Yunqiang(wangyq@ieecas.cn)
	2020-03-15
发表期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
卷号	282 页码:11
摘要	Soil drought caused by climatic change and/or poor land management in arid and semi-arid regions are seldom recognised due to a lack of comparative data on soil moisture (SM) in soil profiles. This lack of information endangers the sustainability of these fragile ecosystems. The current study assessed spatial-temporal variations of soil drought, as indicated by dried soil layers (DSL), at a watershed scale, and tested the hypothesis that soil drought in deep profiles is controlled by the combined effects of meteorological processes, land use, and topography. We measured SM to a depth of 500 cm on 20 occasions at 73 locations from 2013 to 2016 at a small watershed on the Chinese Loess Plateau (CLP). We also collected data on possible environmental factors including meteorological variables, land use, topographical elements, and soil properties. The DSLs occurred at > 90% of the sampling sites within the watershed, and the spatially and temporally averaged DSL formation depth (DSLFD), DSL thickness (DSLT) and soil water content within the DSL (DSL-SWC) were 125 cm, 257 cm, and 10.4%, respectively. This suggests that 51.4% of the 500-cm-profile is drying out below 125 cm. The DSLFD, DSLT and DSL-SWC demonstrated a moderate degree of variability (20% < CV < 84%) in space, and showed a moderate, moderate and weak temporal variability, in time, respectively. The temporal series of the mean spatial DSLT and DSLFD were significantly correlated with climatic variables. The spatial variation of the mean temporal DSL-SWC differed significantly among the land uses and between shaded and sunlit aspects. We found that plan curvature, slope gradient, clay and silt content regulated DSLs in both space and time. This result verified our hypothesis that meteorological processes, land use, and topography play an essential role in shaping DSL variation and distribution pattern. Taking DSL reclamation into account in the study area, grassland would be the optimum land use type. Understanding this information is helpful for watershed soil and water conservation, and soil drought meditation via the best management practices in the CLP and other water-limited regions with deep soils.
关键词	Deep soils Land use Meteorological variables Soil texture Topography The Loess Plateau
DOI	10.1016/j.agrformet.2019.107866
关键词[WOS]	LOESS PLATEAU ; SPATIAL VARIABILITY ; GULLY REGION ; APPLE-TREES ; MOISTURE ; SCALE ; DESICCATION ; CLIMATE ; CARBON ; VEGETATION
收录类别	SCI ; SCI
语种	英语
资助项目	National Natural Science Foundation of China[41722106] ; National Natural Science Foundation of China[41530854] ; National Natural Science Foundation of China[41971045] ; National Natural Science Foundation of China[41471189] ; Youth Innovation Promotion Association CAS
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
项目资助者	National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000525813300011
出版者	ELSEVIER
引用统计	被引频次：29[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/12578
专题	生态环境研究室
通讯作者	Wang, Yunqiang
作者单位	1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China 2.Beijing Normal Univ, Interdisciplinary Res Ctr Earth Sci Frontier, Beijing 100875, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 4.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 5.New Zealand Inst Plant & Food Res Ltd, Private Bag 4704, Christchurch 8140, New Zealand 6.Xi An Jiao Tong Univ, Dept Earth & Environm Sci, Xian 710049, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yunqiang,Shao, Ming'an,Sun, Hui,et al. Response of deep soil drought to precipitation, land use and topography across a semiarid watershed[J]. AGRICULTURAL AND FOREST METEOROLOGY,2020,282:11.
APA	Wang, Yunqiang.,Shao, Ming'an.,Sun, Hui.,Fu, Zihuan.,Fan, Jun.,...&Fang, Linchuan.(2020).Response of deep soil drought to precipitation, land use and topography across a semiarid watershed.AGRICULTURAL AND FOREST METEOROLOGY,282,11.
MLA	Wang, Yunqiang,et al."Response of deep soil drought to precipitation, land use and topography across a semiarid watershed".AGRICULTURAL AND FOREST METEOROLOGY 282(2020):11.