Spatial heterogeneity of soil available nutrient in Jinghe basin of Xinjiang

GIS and the fundamentals and methods of geostatistics were applied to regionalize the spatial distribution pattern of Available Potassium, Available Phosphorus, Available Nitrogen and Organic Matter in Jinghe Basin. The results showed that: 1 It is clearly founded that the spatial heterogeneity of the soil available nutrient in Jinghe basin, and the human activities had seriously impacted on the spatial heterogeneity of soil quality. The order in spatial variation of different soil quality element was: available phosphorus > organic matter > available nitrogen > available potassium. 2 The theory model of organic matter and available potassium well fitted the index model, and the theory models of the available phosphorus and nitrogen well fitted the spherical model. 3 Four elements in four directions had the different isotropy. The available nitrogen demonstrated isotropy in different directions; Organic matter and available potassium take the second place; Available phosphorus demonstrated the larger spatial variation degree in different directions. All the changes of isotropy were mainly due to the natural factors differences from the lake bank - Oasis - Desert - mountain.