Spatial Variability of Soil pH-value and Nutrient in Shenyang City

Geo-statistics combined with Geographical Information System(GIS)was applied to analyze the spatial variability of soil pH-value and soil nutrients including total P,available K in Shenyang city.The results showed that theoretical semivariogram models of pH-value,total P and available K were all best described by exponential model.The ratios of nugget to sill C0/(C0+C) of total P and available K were 10.62% and 9.94% respectively,which indicated that the spatial correlation of soil total P,available K was strong,their spatial variability was mainly caused by structural factors.The ratio of nugget to sill C0/(C0+C) of pH-value was 44.25%,which indicated that the spatial correlation of pH was moderate,its spatial variability was caused by random factors and structural factors.And the spatial distributions of pH,total P and available K in Shenyang city were analyzed by Kriging interpolation method.