GIS Based Soil Heavy Metal Spatial Differentiation And Environmental Evaluation In Mingxi County

In this article,by taking Mingxi county,a typical agricultural area of Fujian Province as survey and research region,the content of arable soil heavy metals and its special distribution are investigated by means of GIS geostatistics and Kriging method.The key findings are as follows:The arable soil of survey and research region is not contaminated by heavy metals in general.The contents of Cd,Cu,Pb are all inferior to the environmental quality standard for soils in China(Grade II)and the basal content in Fujian.The range of variation of heavy metals is:Cd>Pb>Cu.The spatial relevance of Cd and Cu is quite strong,while the spatial relevance of Pb is weak.Kriging’s results show as following:the high content of Cd and Pb are distributed in the small part of survey regions,while the high content of Cd locates in the northern Hanxian Town and the northeastern Chengguan Town in Mingxi County;the high content of Pb locates in the northern Xuefeng Town,Chengguan Town,and the eastern Shaxi Town;the high content of Cu locats in the Fengxi Town,Xiafang Town,Gaiyang Town and Hanxian Town;there is high content of Pb in the part of Xuefeng Town,Chengguan Town and Shaxi Town.