Spatial Variability Analysis on Soil Nitrogen and Phosphorus Experiment Based on Geostatisics

Taking Wudaogou Station as the experimental basis, Geostatisics combined with ArcGIS was applied to analyze agricultural non-point sources (AGNPS) pollution characters caused by spatial variability of nitrogen and phosphorus in agricultural soil. A field sampling scheme and structure are to carried out for three different scale watersheds by combining random sampling and systematic sampling method. Through rainfall, runoff and field soil monitoring experiment the spatial space characters of nitrogen, TN, solved phosphate and TP is achieved by Geostatisics and the TP and TN distribution trend in different space scale is figured out. Besides in the paper spatial scale influence to AGNPS and spatial relativity and variability of soil nutrients and nitrogen and phosphorus loss process in outlet caused by spatial Soil variability is discussed. The experiment analysis results can be used to simulate runoff and nutrient loss process in other similar watersheds and the research also indicates the application of Geostatisics technique in large spatial scale is more convenient and helpful in random sampling of AGNPS pollution monitoring.