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Soil moisture dynamics and dominant controls at different spatial scales over semiarid and semi-humid areas
Lizhu Suo1; Mingbin Huang1; Yongkun Zhang2,3; Liangxia Duan4; Yan Shan4; Huang, MB (reprint author), Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China.
SubtypeArticle
2018
Source PublicationJOURNAL OF HYDROLOGY
ISSN0022-1694
description.correspondentemailhmbd@nwsuaf.edu.cn
Volume562Pages:635-647
AbstractSoil moisture dynamics plays an active role in ecological and hydrological processes, and it depends on a large number of environmental factors, such as topographic attributes, soil properties, land use types, and precipitation. However, studies must still clarify the relative significance of these environmental factors at different soil depths and at different spatial scales. This study aimed: (1) to characterize temporal and spatial variations in soil moisture content (SMC) at four soil layers (0-40, 40-100, 100-200, and 200-500 cm) and three spatial scales (plot, hillslope, and region); and (2) to determine their dominant controls in diverse soil layers at different spatial scales over semiarid and semi-humid areas of the Loess Plateau, China. Given the high co-dependence of environmental factors, partial least squares regression (PLSR) was used to detect relative significance among 15 selected environmental factors that affect SMC. Temporal variation in SMC decreased with increasing soil depth, and vertical changes in the 0-500 cm soil profile were divided into a fast-changing layer (0-40 cm), an active layer (40-100 cm), a sub-active layer (100-200 cm), and a relatively stable layer (200-500 cm). PLSR models simulated SMC accurately in diverse soil layers at different scales; almost all values for variation in response (R-2) and goodness of prediction (Q(2)) were > 0.5 and > 0.0975, respectively. Upper and lower layer SMCs were the two most important factors that influenced diverse soil layers at three scales, and these SMC variables exhibited the highest importance in projection (VIP) values. The 7-day antecedent precipitation and 7-day antecedent potential evapotranspiration contributed significantly to SMC only at the 0-40 cm soil layer. VIP of soil properties, especially sand and silt content, which influenced SMC strongly, increased significantly after increasing the measured scale. Mean annual precipitation and potential evapotranspiration also influenced SMC at the regional scale significantly. Overall, this study indicated that dominant controls of SMC varied among three spatial scales on the Loess Plateau, and VIP was a function of spatial scale and soil depth.
KeywordEnvironmental Factors Scale Dependency Soil Depth Partial Least Squares Regression Loess Plateau
Subject AreaEngineering ; Geology ; Water Resources
DOI10.1016/j.jhydrol.2018.05.036
Indexed BySCI
Publication PlacePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language英语
WOS IDWOS:000438003000049
PublisherELSEVIER SCIENCE BV
Funding OrganizationNSFC-RCUK_NERC [41571130082] ; NSFC-RCUK_NERC [41571130082] ; National Natural Science Foundation of China [41390463, 41571213] ; National Natural Science Foundation of China [41390463, 41571213]
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8215
Collection水保所科研产出--SCI_2018--SCI
Corresponding AuthorHuang, MB (reprint author), Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China.
Affiliation1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
2.Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
3.MWR, Yangling 712100, Shaanxi, Peoples R China
4.Northwest A&F Univ, Coll Resources & Environm, Yangling 712100, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Lizhu Suo,Mingbin Huang,Yongkun Zhang,et al. Soil moisture dynamics and dominant controls at different spatial scales over semiarid and semi-humid areas[J]. JOURNAL OF HYDROLOGY,2018,562:635-647.
APA Lizhu Suo,Mingbin Huang,Yongkun Zhang,Liangxia Duan,Yan Shan,&Huang, MB .(2018).Soil moisture dynamics and dominant controls at different spatial scales over semiarid and semi-humid areas.JOURNAL OF HYDROLOGY,562,635-647.
MLA Lizhu Suo,et al."Soil moisture dynamics and dominant controls at different spatial scales over semiarid and semi-humid areas".JOURNAL OF HYDROLOGY 562(2018):635-647.
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