Study on spatial variability of soil nutrient in saline area,Lower Haihe Plain

The spatial structures of six soil properties in the saline and waterlogging land(2700m×2100m) region in Lower Haihe Plain are analyzed by means of the geostatistics.The results show that there exists perfect semivariance structure for the spatial variability of main soil attributes such as total N,available N,available P,available K and organic matter,other than total P,under the rotation of tillage situation.The semivariograms can be fitted by exponential and spherical models and the limit distance of spatial correlation is 340～1173m.The proportion of structural variance to sill is in a high level,over 40%.