The Heavy Metals Of Dahongshan Coppermine Derelict Land To The Activity Of Soil Biochemical

Ecological restoration is the necessary way to deal with economic development and environmental protection of mining wasteland. This study is based on the da hongshan-copper mine of Xingping in yunnan province of china. We select three representative mining wastelands, such as a waste-rock yard and tailings pond and industrial wasteland and a non-mining area to collect soil sample. We use the conventional method to detect the determining quotas include the PH of soil, physical and chemical properties of soil sample,including the organics, available phosphate, total nitrogen, alkali-hydrolyzale nitrogen, rapidly available potassium, total phosphorus and total potassium and the heavy metals such as Cu、Zn、Pb、Cd content analysis.The results show that soil fertilizer effect is highest, the tailings is the worst. The results show that it is difficulty for tailings pond witch result from the copper mining for vegetation restoration. As has been the ecological restoration for many years, the surface of waste-rock yard and industrial wasteland are covered by some vegetation, fertilizer efficiency increased. The data analysis of the soil heave metal results display that the pollution causes from the Cu is the most serious, and the pollution result from Cd is relatively small. The risk assessment of heavy metals show that the RI (ecological index method)≥600of three points in the industrial waste site, waste rock, tailings. It shows the strong ecological harm in these positions. RI<150of point exist in the non-mining area with slight ecological harm. The E ir≥320(potential ecological harm coefficient) of Cu in waste rock and tailings. The industrial waste site, Pb of the waste rock and tailings and Cd of the tailings always embody strong ecological harm. E’i r of Zn<40show mild ecological damage. E i r of Cd in waste rock≥160or<320show strong ecological harm. The Eir<40of metal elements in non-mining area show mild ecological damage.We separate and purify the soil microbial use many different medium. Then, measured the quantity of microbial and identify the microbial. The result show the soil microbial quantity has decreased obviously in non-mining area than the derelict land of mining area. The azotobacters are more sensitive to heavy metal pollution among them. Its decline is from93.25%to99.06%, followed by nitrifying bacteria, cellulose decomposing bacteria, bacteria, actinomycetes and fungi. The data analysis of enzyme activity and soil biochemical intensity shows that the enzyme activity is reduced and intensity of soil biochemical effect weakened. The soil microbial is the one of index for soil ecological restoration in mining. Soil biological activity can reflect the Soil biological activity can reflect the features of mining area of soil microbial ecology of soil microbial in mining area.Combined with grey correlation analysis method for studying the degree of association between microorganism quantity and the Cu、Pb、Zn、Cd and pH. We found that the main factors influencing soil microbial is heavy metal and PH. The degree of association sorted by size in the order is Cd、Pb、Zn and Cu. The microorganisms of the mining wasteland in big red hill are sensitive with the PH and the heave metal Cd. The pH and Cd of derelict land can restrain the growth and reproduction of soil microorganisms.Therefore, combining the reclamation measures and recovery measures, this paper puts forward targeted ecological restoration of abandoned land of big red hill copper mine design. We used measures of vegetation restoration and soil improvement and other complementary measure to realize the ecological restoration in mining land. We can also use measures of vegetation restoration and oil physical structure improvement methods in waste-rock yard. Put forward measure that it is from soil preparation、turn the soil、soil improvement to tree species selection for the tailings. Witch can guide the ecological recovery of the same mine.