Preliminary Study on Time Spatial Variability of Soil Water Pressure

The soil-water pressure is measured by 100 individual tensionmeters for a long time in a 30m×30m field with sandy loam soil in Yongledian Irrigation experimental station.Through analysis, it can be found that the relationship between the variance and the mean of the pressure can be described by a quadric function,and the variance increases with the mena of the pressure. Finally, the semivariogram of the soil-water pressure is simulated.