Screening of Dominant Plants for Phytoremediation Potential in the Waste Dump of the Shilu Iron Mining Area Contaminated with Heavy Metals
The slope of a waste dump from the Shilu iron mine covers a large area with severe soil heavy metal Arsenic(As),cadmium(Cd),and lead(Pb)pollution.In this study,the enrichment and transfer capacity of three plant species such as Vetiv-eria zizanioides,Pennisetum hydridum,and Crotalaria pallida,to five heavy metals(As,Cd,Pb,Cr,and Ni)in the waste dump of the Shilu mining area were analyzed after one year of planting.The three plant species reduced the contents of five heavy metals in the soil of the Shilu iron mine waste dump,and the pollution indices of the five heavy metals also decreased.Planting V.zizanioides can decrease the pollution degree of As from heavy pollution to light pollution,and planting P.hy-dridum can reduce the pollution degree of Pb from light pollution to no pollution.Compared with those of the other four heavy metals,the three plant species had greater transfer capacities for Cd,especially V.zizanioides,with an enrichment coefficient of 4.19,followed by P.hydridum,with an enrichment coefficient of 2.59,and C.pallida had the lowest enrichment effect on cadmium,with an enrichment coefficient of 1.52.Cd mainly accumulates in the roots of V.zizanioides and P.hydridum but is mainly transferred to the aboveground parts of C.pallida plants.The enrichment coefficients of the three plants for four kinds of heavy metals(As,Pb,Cr,and Ni)except for Cd are all less than 1,indicating that they are of the avoidance type and can be used as pioneer plants for the remediation of waste dumps in Shilu iron mining areas.
iron miningwaste dumpheavy metal pollutionphytoremediation
万方数据
维普
