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Regional-scale variation and distribution patterns of soil saturated hydraulic conductivities in surface and subsurface layers in the loessial soils of China
Wang, YQ (Wang, Yunqiang)[ 1,2,3 ]; Shao, MA (Shao, Ming'an)[ 2 ]; Liu, ZP (Liu, Zhipeng)[ 3,4 ]; Horton, R (Horton, Robert)[ 5 ]
2013-04-22
发表期刊JOURNAL OF HYDROLOGY
卷号487页码:13-23
文章类型期刊论文
摘要

Saturated hydraulic conductivity (K-s) is an important soil property that shows a high degree of spatial heterogeneity. There is a lack of research that investigates and determines Ks at a regional scale, due to the challenges associated with the required intensive sampling. To determine the closely correlated factors affecting K-s at a regional scale and to then generate a regional distribution map of K-s, we selected 382 sampling sites across the Loess Plateau of China (620,000 km(2)) and collected undisturbed and disturbed soil samples from two soil layers (0-5 and 20-25 cm). We found that both surface K-s and subsurface K-s had log(base 10)-normal distributions, and demonstrated strong spatial variability (CV = 206% and 135%, respectively). Surface LogK(s) was most closely correlated with LogSand, LogSilt, LogSG (slope gradient), LogSSWC (saturated soil water content), vegetation coverage and land use; while subsurface Logic was correlated with LogClay, SSWC, LogSG, LogAltitude, LogGY (growth year) and land use. Geostatistical analysis indicated that semivariograms of surface and subsurface Log K-s could be best fitted by an isotropic exponential model, with effective ranges of 204 km and 428 km, respectively. Distribution maps of K-s produced by kriging indicated a pronounced spatial pattern and demonstrated an obvious spatial depth gradient. The spatial distribution patterns of K-s at a regional scale in the loessial soils of China comprehensively reflected soil hydraulic properties and the combined effects of soil texture, vegetation, topography and human activities.

关键词Land Use Soil Texture Principal Component Analysis Minimum Data Set Geostatistics Soil Hydraulic Conductivity
DOI10.1016/j.jhydrol.2013.02.006
收录类别SCI ; EI
语种英语
引用统计
被引频次:32[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/10010
专题生态环境研究室
通讯作者Shao, MA (Shao, Ming'an)[ 2 ]
作者单位1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, Shaanxi 710075, China;
2.Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences,Beijing 100101, China;
3.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources,Yangling 712100, China;
4.Agronomy Department, Iowa State University, Ames, IA 50011, USA
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Wang, YQ ,Shao, MA ,Liu, ZP ,et al. Regional-scale variation and distribution patterns of soil saturated hydraulic conductivities in surface and subsurface layers in the loessial soils of China[J]. JOURNAL OF HYDROLOGY,2013,487:13-23.
APA Wang, YQ ,Shao, MA ,Liu, ZP ,&Horton, R .(2013).Regional-scale variation and distribution patterns of soil saturated hydraulic conductivities in surface and subsurface layers in the loessial soils of China.JOURNAL OF HYDROLOGY,487,13-23.
MLA Wang, YQ ,et al."Regional-scale variation and distribution patterns of soil saturated hydraulic conductivities in surface and subsurface layers in the loessial soils of China".JOURNAL OF HYDROLOGY 487(2013):13-23.
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