Analysis of Spatial Distribution Characteristics of Heavy Metals in Cultivated Land of Nehe City

This study aimed at gaining the cultivated land quality and the situation of soil pollution, taking Nehe City in Heilongjiang Province as an example, used ordinary Kriging interpolation of geostatistics, investigated the content and spatial distribution of eight kinds of heavy metal elements（namely Cd, Cr, Pb, Cu, Zn, Ni, Hg and As） in farming land soil, then analyzed the distinction and potential source of these heavy metal elements. The result showed that（1） all these elements had a certain amount of accumulation compared with those in the background of Heilongjiang Province, among which the accumulated levels of Cu and As were the highest.（2） Through statistic analyses, it showed that the spatial autocorrelation degrees of these four elements（namely Cd, Cr, Cu and Zn） were higher.（3） The pollution of Cd and Cu was relatively severe.（4） The spatial distribution features of these eight kinds of heavy metal elements were different, and the soil parent material and the human activity played double roles in the content distribution of heavy metal elements in farming land soil.