Optimization of Monitoring Network Point about Total N in Soil in Hangjiahu Plain

Abstract

In this paper, Monitoring network point about total content of Nitrogen in surface soil was studied on optimization in Hangjiahu plain, based on the geostatistics, variance and linear correlation. And Background of Total N in soil were compared before and after network point optimization. The result showed that sampling density may improve from 1 point/4km2 to 1 point/64km2. this monitoring result of Total N only can reflect spatial distribution of Nitrogen, but can not reveal its actual circumstance. Detailed investigation of the lowest scale must be done if the distribution of Nitrogen in surface Soil wanted to be understood comprehensively. Zhejiang Province had firstly completed multi-purpose geochemical survey for 1:250000 from 2002 to 2005 [1]. Total N content in surface soil was the central task of the survey because high nitrogen content in soil fertility was not only the characteristics of the land but also one of the reasons of non-point source pollution. In order to grasp the overall trend of geochemical in Hangjiahu plain and timely discover the changes about environment quality of soil total N elements, a multi-level environmental geochemistry monitoring network must be promptly established[2]. But it’s a problem needed to be solved immediately by the geological, environmental and agricultural scientists that how to meet the needs of the accuracy of the premise, with a minimum of sampling points to design the best program of distribution, thereby saving time and cost of sampling. At present, most people used properties of soil spatial variability and spatial analysis methods to solve this problem [3].