Abstract:

Being chronically accumulated in the pedosphere, the heavy metal elements and other elements bring certain influences on the environment and consequently were harmful to the food chain. The division on pollution degree of soil elements is of great importance to acquire current soil environment situation. Based on the multiobjective regional geochemical survey data, in this paper, heavy metal elements including Hg, Cd, As, Pb, Cu, Zn, Ni, Cr according to soil environmental quality level Ⅰ standard value and F element according to level Ⅰ recommended value were chosen to calculated the pollution index by Nemerow formula and finally used to drew the figure of soil pollution levels, respectively. As a result, the Yinchuan basin would be divided into cleaning area, basic cleaning area, initial pollution area, light pollution area, moderate pollution area and severe pollution area, and additionally the pollution sources were also analyzed and summarized.

Key words: multi-objective geochemistry, Yinchuan basin, soil environment, pollution degree