Heavy Metal Contents and Accumulation Characteristic of Dominant Plants in Tin Mining Wasteland of Gejiu city,Yunnan,China
Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering
KEYWORD: Wasteland; Heavy metal; Dominant species ABSTRACT: Land contaminated by high levels of heavy metals in Tin mining wasteland is urgent to be remediated.To find out the tolerant plants which can adapt to the local climate and the soil conditions is thesystem restoration of the area. Results showed that the average content of soil heavy metals of Mn, Cu, Cd and Zn were 5733.8702mg/kg, 2250.7998mg/kg, 1974.8084mg/kg and 17.0273mg/kg, the soil was alkaline soil in the wasteland. It was
... teland. It was found that the 12 wild plants had different abilities of uptake and accumulation of Mn, Cu, Cd and Zn. The bioaccumulation factor (BCF) of all the dominant plants were less than 1, only Polygonum capitatum and Hippochaete debilis of BCF were relatively large, and the biological transfer factor (BTF) of Polygonum capitatum to Mn and Zn were more than 1, the BTF of Hippoc premise and foundation of vegetation reconstruction.Analyzed the amount of heavy metals, and the enrichment and transporting features of heavy metals, such as Mn, Cu, Cd and Zn, in the dominant species in the district, and then we select the pioneer plants for ecohaete debilis to Cd and Zn were more than 1. In general, the results indicate that the two plants had strong capability of BCF and BTF to heavy metals. Apart from two plants, other 10 dominant plants had a better tolerance in metal pollution in mining area, and they can be used as pioneer plants of ecological rehabilitation in tin mining wasteland.