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Vertical distribution and temporal stability of soil water in 21-m profiles under different land uses on the Loess Plateau in China
Wang, Yunqiang1,2,3,4; Hu, Wei5; Zhu, Yuanjun2,3; Shao, Ming'an4; Xiao, Shun6; Zhang, Chencheng2,3
2015-08-01
Source PublicationJOURNAL OF HYDROLOGY
ISSN0022-1694
Volume527Issue:2015Pages:543-554
SubtypeArticle
Abstract

Deep soil-water content (SWC) plays a crucial role in water-limited terrestrial ecosystems, because plant roots can extract soil water from depths of 20 m or more. The distribution of soil water and its temporal variation in deep (>5 m) soil profiles are not completely understood, partly due to the time and labor needed for their determination. We examined the vertical distribution patterns and temporal stabilities of soil water in 21-m soil profiles for two years under four typical land use types in the Liudaogou watershed of the Chinese Loess Plateau (CLP). The SWCs exhibited considerable variability over both depth and time under farmland, natural grassland, planted grassland, and shrubland. The soil profile could be partitioned into an active layer (0-2 m) and a relatively stable layer (2-21 m) based on the amount of temporal change in SWC. The mean available soil water contents (AWCs) among the land use types in the depth-time domain differed significantly (P < 0.05), and followed the order: farmland (7.1%) > natural grassland (6.5%) > planted grassland (5.7%) > shrubland (4.9%). The mean available soil water storage for each 1-m-depth (AWS(1m)) in the 0-21 m profile, in the time domain, ranged from 50.3 to 71.4 mm among the four land use types. Within the 21-m profile, as the depths of sub-profiles increased from 3 m to 21 m, the most temporally stable depths (MTSDs) of AWS(1m) tended to become deeper in a step-like manner, producing ranges of MTSDs of 3-18 m, 2-15 m, 2-9 m, and 3-20 m under farmland, natural grassland, planted grassland, and shrubland, respectively. The ability of the MTSDs to estimate the mean AWS(1m) in a soil profile was generally acceptable for each sub-profile, as indicated by the RMSD and RBIAS values obtained from a validation dataset, which ranged from 3.6 to 7.7 mm and from 0.07 to 0.13, respectively, among the four land use types. The mean AWS(1m) within the 21-m profile could, in general, be accurately estimated by measuring AWC to a depth of only 18 m based on the temporal stability analysis. Land use greatly affected the vertical distributions and temporal stabilities of the AWC in the deep soils. The knowledge obtained from this information is vital for the sustainable use of water resources, rational management of various land uses, and scientific determinations of soil water in deep soils on the CLP and possibly in other fragile ecosystems covered by deep soils around the world. (C) 2015 Elsevier B.V. All rights reserved.

KeywordDeep Soil Land Use Mabe Temporal Stability Most Temporally Stable Depth The Chinese Loess Plateau
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
DOI10.1016/j.jhydrol.2015.05.010
WOS KeywordSpatial Variability ; Time Stability ; Hillslope Scale ; Moisture ; Storage ; Patterns ; Layers ; Catchment ; Surface ; Afforestation
Indexed BySCI
Language英语
WOS Research AreaEngineering ; Geology ; Water Resources
WOS SubjectEngineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS IDWOS:000358629100047
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9272
Collection生态环境研究室
Corresponding AuthorWang, Yunqiang
Affiliation1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China
2.Chinese Acad Sci, State Key Lab Soil Eros & Dryland Farming Loess P, Inst Soil & Water Conservat, Yangling 712100, Peoples R China
3.Minist Water Resources, Yangling 712100, Peoples R China
4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
5.Univ Saskatchewan, Dept Soil Sci, Saskatoon, SK S7N 5A8, Canada
6.Shaanxi Meteorol Bur, Xian 710014, Peoples R China
Recommended Citation
GB/T 7714
Wang, Yunqiang,Hu, Wei,Zhu, Yuanjun,et al. Vertical distribution and temporal stability of soil water in 21-m profiles under different land uses on the Loess Plateau in China[J]. JOURNAL OF HYDROLOGY,2015,527(2015):543-554.
APA Wang, Yunqiang,Hu, Wei,Zhu, Yuanjun,Shao, Ming'an,Xiao, Shun,&Zhang, Chencheng.(2015).Vertical distribution and temporal stability of soil water in 21-m profiles under different land uses on the Loess Plateau in China.JOURNAL OF HYDROLOGY,527(2015),543-554.
MLA Wang, Yunqiang,et al."Vertical distribution and temporal stability of soil water in 21-m profiles under different land uses on the Loess Plateau in China".JOURNAL OF HYDROLOGY 527.2015(2015):543-554.
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