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Spatial heterogeneity of soil detachment capacity by overland flow at a hillslope with ephemeral gullies on the Loess Plateau
Li, Zhen-wei1,2,3; Zhang, Guang-hui1,4; Geng, Ren4; Wang, Hao4
2015-11-01
Source PublicationGEOMORPHOLOGY
ISSN0169-555X
Volume248Pages:264-272
AbstractEphemeral gullies are typical erosional landforms and widespread on the Chinese Loess Plateau. To better understand the spatial variability in soil detachment capacity (DC) by overland flow and its influence at a hillslope with an ephemeral gully, this study investigates a hillslope on the Loess Plateau using classical statistics, geostatistical analysis, and principal component analysis. Undisturbed soil samples were collected from 202 sites along nine 90 m transects in two completely developed ephemeral gullies, and were scoured in a laboratory flume under consistent hydraulic conditions. The results indicate that DC varied widely from 0.0004 to 1.25 kg m(-2) s(-1) with a mean of 022 kg m(-2) s(-1). The coefficient of variation also shows a high variability in DC. The ephemeral gullies were divided into four sections (uppermost, upper, middle and lower slopes) and DC differed significantly among the four sections. A semivariogram of DC indicated a moderate spatial dependence. The sampling interval significantly affects the spatial pattern of DC When the sampling interval decreased from 10 to 2 m, the nugget variance decreased, whereas structured variance, spatial dependence, and range increased. Distribution maps of DC, derived from kriging interpolation, showed that samples in the lower slope position have greater DC than the other positions. DC significantly correlates with clay content, sand content, median soil grain size, bulk density, cohesion, water stable aggregate, and litter mass density. Principal component analysis (PCA) and a minimum data set (MDS) method identified that the median soil grain size, bulk density, and litter mass density were the major factors affecting the spatial variability in DC. (C) 2015 Elsevier B.V. All rights reserved.
SubtypeArticle
KeywordWater Erosion Detachment Capacity Spatial Variability Ephemeral Gully
WOS HeadingsScience & Technology ; Physical Sciences
WOS Subject ExtendedPhysical Geography ; Geology
DOI10.1016/j.geomorph.2015.07.036
WOS KeywordDIFFERENT LAND USES ; CONCENTRATED-FLOW ; SEDIMENT TRANSPORT ; EROSION PROCESSES ; NORTHEAST CHINA ; STEEP SLOPES ; SHALLOW FLOW ; ERODIBILITY ; VARIABILITY ; PARAMETERS
Indexed BySCI
Language英语
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000361867900020
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/67866
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZhang, Guang-hui
Affiliation1.Chinese Acad Sci & Minist Water Resources, State Key Lab Soil Eros & Dryland Farming Loess P, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
2.Chinese Acad Sci, Key Lab Agroecol Proc Subtrop Reg, Inst Subtrop Agr, Changsha 410125, Hunan, Peoples R China
3.Chinese Acad Sci, Huanjiang Observat & Res Stn Karst Ecosyst, Huanjiang 547100, Peoples R China
4.Beijing Normal Univ, Sch Geog, Beijing 100875, Peoples R China
Recommended Citation
GB/T 7714
Li, Zhen-wei,Zhang, Guang-hui,Geng, Ren,et al. Spatial heterogeneity of soil detachment capacity by overland flow at a hillslope with ephemeral gullies on the Loess Plateau[J]. GEOMORPHOLOGY,2015,248:264-272.
APA Li, Zhen-wei,Zhang, Guang-hui,Geng, Ren,&Wang, Hao.(2015).Spatial heterogeneity of soil detachment capacity by overland flow at a hillslope with ephemeral gullies on the Loess Plateau.GEOMORPHOLOGY,248,264-272.
MLA Li, Zhen-wei,et al."Spatial heterogeneity of soil detachment capacity by overland flow at a hillslope with ephemeral gullies on the Loess Plateau".GEOMORPHOLOGY 248(2015):264-272.
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