Research on Spatial Variation of Soil Nutrient in Linyi Country, China

Soil nutrient content can directly influence the agricultural production and environmental safety. As the result of the influence of natural factors and human factors, the distribution of soil nutrient has spatial variation. Linyi is the research areas. The object of this study is revealing the space distribution of soil nutrient and overall level in Linyi, using investigation, chemical analyses, traditional statistics, geostatistics and GIS. This study measured the contents of total nitrogen, total phosphorus, total potassium and organic matter in soil. The results indicate that the four soil nutrient have semi-variance structure. But, their spatial structure features are distinct. The content of total nitrogen was mainly affected by natural factors, but the contents of total phosphorus, total potassium and organic matters were mainly affected by random factors. And their space distributions were difference. In addition, the ranges of soil nutrient were smaller than the distances between sample points. Therefore, the accuracy of this study is not high enough. In the future study, the distance between two sample points had better to be smaller than the range.