Abstract:

The black soil region is one of the most important food bases in China, and it plays a vital role in food security and national economy. In this paper, the total content of the cultivated black soil and made a study on the current pollution in Hulan, Suihua, Hailun, Yi’an and Nenjiang. This article’s aim is reveal health of the cultivated black soil, and provide a theoretical basis for scientific management of the black soil ecosystem. The assessment of the comprehensive environmental quality was conducted by adopting the Nemerow Comprehensive Pollution Index and TOPSIS method. The results showed that, from the southeast to the northwest, there was no obvious distribution law in the pollution level of Cu, Pb and Zn of soil. The pollution level of Cu, Pb and Zn in Hulan and Yi’an was lower than that in Suihua, Hailun and Nenjiang; and it increased with deepening of soil profile in most of sample plots. Only in Suihua, the pollution level of the 10-20 cm soil layer was lower than that of the 0-10 cm soil layer. There was no prominent relevance among Cu, Pb and Zn, which indicated that the three elements came from different sources. The result of two methods was closely consistent, the environmental quality of black soil was good in each survey area.