Application of Variation Function in Soil Infiltration Parameters of Yucheng City

The spatial variability of the steady infiltration rate was studied by geo-statistics method in this paper.The results showed that the steady infiltration rate had larger spatial variability and submitted to lognormal distribution.According to geo-statistical method,the spatial structures of the steady infiltration rate can be characterized by the spherical variogram function model.The correlation scales of the steady infiltration rate in surface stratum and the plough pan were 23.7 m and 17.2 m,respectively.In the end,the Kriging interpolation technique was used to estimate the steady water infiltration rate spatial distribution over the entire plot area.