Spatio-temporal Variability of Soil Water Content in Sloping Field of the Southwest Upland

Spatio-temporal variability of soil water content was studied with geo-statistical method in sloping field of the Southwest upland.Results show that soil water content has different spatial structures in different soil layers and different seasons in our study area.They can be simulated with pure nugget effect model,linear model,exponential model and spherical model.Mean soil water content,water content and parameters of the semi-variogram except the range are changing with the season,but they have not apparent changing rule according with different layers.Spatial relativity of the soil moisture is fluctuating with the season.Changing trend of the nugget of the soil moisture content is similar to the sills.Mean soil water content has different spatial distribution according to the Kriging.