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Spatial distribution of water-active soil layer along the south-north transect in the Loess Plateau of China
Zhao, Chunlei1,2; Shao, Ming'an1,2,3; Jia, Xiaoxu1,2; Huang, Laiming1,2; Zhu, Yuanjun3,4
2019-04-01
Source PublicationJOURNAL OF ARID LAND
ISSN1674-6767
Volume11Issue:2Pages:228-240
Corresponding AuthorZhu, Yuanjun(zhuyuanjun@foxmail.com)
AbstractSoil 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.
Keywordwater active layer soil water content redundancy analysis pedotransfer function artificial neural network Loess Plateau
DOI10.1007/s40333-019-0051-4
WOS KeywordTEMPORAL STABILITY ; BULK-DENSITY ; VARIABILITY ; PROFILES ; STORAGE ; REGION
Indexed BySCI
Language英语
Funding ProjectNational 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]
Funding OrganizationNational Natural Science Foundation of China ; National Key Project for Research and Development ; Youth Innovation Promotion Association of Chinese Academy of Sciences
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000465023800006
PublisherSPRINGER HEIDELBERG
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/48220
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZhu, Yuanjun
Affiliation1.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
Recommended Citation
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.
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