The Spatial Heterogeneity of Soil Moisture after Raining in Representative Gully Catchment of the Alpine Meadow

Using a typical case of small watershed in an alpine meadow,this paper studied the spatial heterogeneity of soil moisture after raining using GIS software and the Kriging interpolation method.The results for soil moisture modeling are as follows:the optimal model for the soil layer 0-10,10-20,20-30,30-40 and 40-50 cm below the surface are spherical.The results for spatial heterogeneity are as follows:within the watershed,the five soil layers within 0-50 cm below the surface and the mean soil moisture have moderate spatial heterogeneity.The nugget coefficient are 43.7%,58.9%,53.0%,71.6%,68.1% and 38.4%,respectively.Furthermore,the Simi-variance function and Kriging interpolation map of soil moisture both indicated spatial structure characteristics well.The ranges of the five layers were 1 375,938,1 428,1 313 and 1 469 m,respectively.The soil layer within 40-50 cm had the maximum range,and the layer within 10-20 cm had the minimum range.