Spatial distribution of water-active soil layer along the south-north transect in the Loess Plateau of China

doi:10.1007/s40333-019-0051-4

	Spatial distribution of water-active soil layer along the south-north transect in the Loess Plateau of China
	Zhao, Chunlei 1,2; Shao, Ming'an 1,2,3; Jia, Xiaoxu 1,2; Huang, Laiming 1,2; Zhu, Yuanjun 3,4
刊名	JOURNAL OF ARID LAND
	2019-04-01
卷号	11 期号:2 页码:228-240
关键词	water active layer soil water content redundancy analysis pedotransfer function artificial neural network Loess Plateau
ISSN号	1674-6767
DOI	10.1007/s40333-019-0051-4
通讯作者	Zhu, Yuanjun(zhuyuanjun@foxmail.com)
英文摘要	Soil water is an important composition of water recycle in the soil-plant-atmosphere continuum. However, intense water exchange between soil-plant and soil-atmosphere interfaces only occurs in a certain layer of the soil profile. For deep insight into water active layer (WAL, defined as the soil layer with a coefficient of variation in soil water content >10% in a given time domain) in the Loess Plateau of China, we measured soil water content (SWC) in the 0.0-5.0 m soil profile from 86 sampling sites along an approximately 860-km long south-north transect during the period 2013-2016. Moreover, a dataset contained four climatic factors (mean annual precipitation, mean annual evaporation, annual mean temperature and mean annual dryness index) and five local factors (altitude, slope gradient, land use, clay content and soil organic carbon) of each sampling site was obtained. In this study, three WAL indices (WALT (the thickness of WAL), WAL-CV (the mean coefficient of variation in SWC within WAL) and WALSWC (the mean SWC within WAL)) were used to evaluate the characteristics of WAL. The results showed that with increasing latitude, WAL-T and WAL-CV increased firstly and then decreased. WAL-SWC showed an opposite distribution pattern along the south-north transect compared with WAL-T and WAL-CV. Average WAL-T of the transect was 2.0 m, suggesting intense soil water exchange in the 0.0-2.0 m soil layer in the study area. Soil water exchange was deeper and more intense in the middle region than in the southern and northern regions, with the values of WAL-CV and WAL-T being 27.3% and 4.3 m in the middle region, respectively. Both climatic (10.1%) and local (4.9%) factors influenced the indices of WAL, with climatic factors having a more dominant effect. Compared with multiple linear regressions, pedotransfer functions (PTFs) from artificial neural network can better estimate the WAL indices. PTFs developed by artificial neural network respectively explained 86%, 81% and 64% of the total variations in WAL-T, WAL-SWC and WAL-CV. Knowledge of WAL is crucial for understanding the regional water budget and evaluating the stable soil water reserve, regional water characteristics and eco-hydrological processes in the Loess Plateau of China.
资助项目	National Natural Science Foundation of China[41530854] ; National Natural Science Foundation of China[41571130081] ; National Key Project for Research and Development[2016YFC0501605] ; Youth Innovation Promotion Association of Chinese Academy of Sciences[2017076]
WOS关键词	TEMPORAL STABILITY ; BULK-DENSITY ; VARIABILITY ; PROFILES ; STORAGE ; REGION
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000465023800006
资助机构	National Natural Science Foundation of China ; National Key Project for Research and Development ; Youth Innovation Promotion Association of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/48219]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhu, Yuanjun
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China 3.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 4.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Chunlei,Shao, Ming'an,Jia, Xiaoxu,et al. Spatial distribution of water-active soil layer along the south-north transect in the Loess Plateau of China[J]. JOURNAL OF ARID LAND,2019,11(2):228-240.
APA	Zhao, Chunlei,Shao, Ming'an,Jia, Xiaoxu,Huang, Laiming,&Zhu, Yuanjun.(2019).Spatial distribution of water-active soil layer along the south-north transect in the Loess Plateau of China.JOURNAL OF ARID LAND,11(2),228-240.
MLA	Zhao, Chunlei,et al."Spatial distribution of water-active soil layer along the south-north transect in the Loess Plateau of China".JOURNAL OF ARID LAND 11.2(2019):228-240.