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[1]HE Xiao-hui,WEN Zhong-ming.Spatial Variability of Soil Water Controlled by the Topographical Factors[J].Research of Soil and Water Conservation,2008,15(02):80-83,87.

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Spatial Variability of Soil Water Controlled by the Topographical Factors

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 15 Number of periods: 2008 02 Page number: 80-83,87 Column: Public date: 2008-04-20

Title:: Spatial Variability of Soil Water Controlled by the Topographical Factors

Author(s):: HE Xiao-hui^1,2, WEN Zhong-ming²; 1. School of Environment and Water Conservancy, Zhengzhou University, Zhengzhou 450001, China;
2. Institute of Soil and Water Conservation, CAS and MWR, Yangling, Shanxi 712100, China

Keywords:: topographic factors; soil moisture; spatial variability; thin plate smoothing spline

CLC:: S152.7

DOI:: -

Abstract:: The Loess Plateau,in western China,is a water limited agricultural region,and water is the most important factor limiting agricultural production as well as re-vegetation in this region.Therefore,understanding the spatial distribution of soil water is of great importance to choice of right species for the right sites at watershed or regional scale.This paper aims at exploring the effect of topographic factors on the spatial distribution of soil water in a small catchment on Loess Plateau using the thin plate smoothing spline method,which can be operated in ANUSPLIN.Topographic factors such as elevation,aspect and slope were derived from DEM with a resolution of 25 m.The results showed that(1) the spatial soil water map produced using thin plate smoothing spline method can provide accurate interpolation of soil water samples and a clearer picture on the effect of topographic factors on soil water than that by Kriging interpolation;(2)statistical analysis showed that the thin plate smoothing spline method improved the accuracy of interpolation about 2 times than Kriging method.

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