Study On The Vegetation Restroration On Copper Mine Tailings Wastelands

Tailings wastelands is the most common,most difficult restoration and most harmful.Tailings wastelands did not only damage vegetation and land,cause soil erosion,but also lead severe damage to the ecological environment.Therefore,vegetation restoration and reconstruction on mining wastelands has been the major issue for environmental academic circle to resolve currently.Based on the all-round tread check for tailings wasteland in Tongling,Anhui,through outdoor investigation and laboratory analysis,this study took Xiangsigu copper tailings wasteland as objects to do the revegetation research.Treating check for plant species naturally settled on Xiangsigu copper tailings wastelands,dominant species were determined.Measuring physical and chemical factors,soil enzyme activity,and heavy metals content,and heavy metal tolerance of plant and plant growth idexs and ecological indicators were analyzed.The effect of different revegetation allocation models was valuated comprehensively by the method of comprehensive analysis to filter out the optimization models for popularization and applation on copper tailings wastelands.The research results can provide for theoretical basis for copper tailings revegetation and phytoremediation of heavy metal contaminated soil.The main results were as follows.1 Plant species naturally settled on Xiangsigu copper tailings wastelands were surveyed by treating check method.Survey found that 36 plant species naturally settled on Xiangsigu copper tailings wastelands,Belong to 14 families.The compositae is the largest,and for the nine.Most species individual quantity is less,or only one,and the number of Miscanthus sinensis and Phragmites australis were largest.2 Physical and chemical factors,soil enzyme activity,and heavy metals content of test sample were measured.Some indexes of test sample were inferior to control soil,such as organic content,total nitrogen content,total phosphorus content,available nitrogen content,rapid available phosphorus content,rapidly available potassium content,proteinase activity,phosphatase activity,urease activity.Some indexes of test sample were exceed to control soil,such as Cu,Pb,Zn,Cd content.3 Soil quality and heavy metal tolerance of plant and plant growth idexs and ecological indicators were analyzed.The effect of different revegetation allocation models was valuated comprehensively by the method of comprehensive analysis to evaluate.Results showed that the 11 kinds of plants can improve copper tailingswastelands.To evaluate soil quality restoration effect alone,whether covering planting or direct planting,I.pseudotinctoria,P.australis,M.suaveolens,L.perenne in the copper tailing vegetation restoration effect is better.Separately to evaluate heavy metals patient status of plants,covering copper tailings waste ground planting L.perenne,P.australis,F.elata patience with the heavy metal is stronger,the copper tailings discarded the ground directly planting stock A.matsumurae,I.pseudotinctoria,R.pseudoacacia of heavy metal tolerance strong.Overall consideration,L.perenne and M.suaveolens in copper tailings of vegetation restoration in the early restoration effect is relatively good.