Quality evaluation of soil based on the ecological reconstruction in Ningdong coal base

From the perspective of environmental protection and ecological reconstruction, the authors used the collection and testing of environmental soil samples to compare and analyze the effects of coal mining on the regional ecological environment, and evaluated the current status of the soil quality. Through analysis, the authors found that the degree of dispersion of all elements in the soil has been increased by 1-4 times (except for Cr, Hg, and P) as compared with things in 2007, which exhibits an increase in the maximum value of element content; nevertheless, the increase is limited, and this area is still low in selenium, nitrogen and phosphorus, and rich in potassium. Moreover, the study area is not substantially contaminated by heavy metals induced by coal mining, with only existence of a very few points of source contaminations of Cd and As. The evaluation results can provide a basis for the development of resources and ecological reconstruction of Ningdong coal base.