Analysis of Spatial Variability and Monitoring Error of Soil Moisture

On the base of the situ data,the spatial variability of soil-water content and its influece factors are analysed,the correlation between monitoring error and spatial variability,and the correlation between monitoring error and sampling number are discussed.The result shows that the error decreases with the rise of sampling number,and rises with the rise of spatial variability.The determination of necessary sampling number is also discussed.