Pollution evaluation of the heavy metal elements on the eco-environment of the Sanjiang Plain based on GIS

The heavy metal elements pollution on the eco-environment of the Sanjiang Plain in Heilongj iang Province was evaluated based on GIS．The results show that the geochemistry environment of the Sanjiang Plain in Heilongjiang Province is good．There is no pollution in most parts of the region，The po llution distribution of Pb and Cr elements is wide Only Muling in the south，Luobei in the northwest，Jixian and Shuangyashan in the middle and Hulin in the east connecting with Raoiiang River show a slight pollution．The pollution index is no more than 1．2．and the po llution regions occupy3．5％ of the total area．AIl of these show that the geochemistry environmental quality of the Sanjiang Plain is good．