广西铅锌矿区土壤重金属污染及优势植物筛选  

Soil Heavy Metal Pollution and Dominant Plants Selection in Pb-Zn Mining Areas of Guangxi

作　　者：路畅[1] 王英辉[1] 杨进文[2] 

机构地区：[1]广西大学环境学院,广西南宁530004 [2]广西融安县国土资源局,广西柳州545400

出　　处：《土壤通报》2010年第6期1471-1475,共5页Chinese Journal of Soil Science

基　　金：广西青年科学基金(0728098);广西教育厅科研项目([2006]26-132);广西自然科学基金(0663012)资助

摘　　要：以广西融安泗顶铅锌矿区为研究对象,分2次进行现场调查,采集了4个尾矿库区和3个排污点的植物和土样进行研究。按国标法测定了重金属含量并研究了优势植物的富集系数和运转系数,土壤重金属污染程度的评价采用综合污染指数法。结果显示,该矿区土壤主要受到Pb和Zn的污染局部伴随着Fe和Mn污染。优势植物的研究表明,部分物种具有较高的耐金属性和运输重金属元素的能力,但是地上部分都没有达到超富集植物的临界值,蜈蚣草对Cr表现出较强的富集能力(BAC为2.27),另外芦苇、白芒、蒲公英和蜈蚣草对Pb和Zn也有较好的富集能力。在重金属污染严重的铅锌矿大面积种植这些植物可以在一定程度上对土壤进行生态恢复。Soils and dominant plants in four tailing mine and three sewage draining points were sampled in Siding Pb-Zn mining areas of Guangxi Province.Heavy metal contents were detected by national standard method and BAC and BTC were studied.The results show that the soil of this mining is seriously polluted by Zinc and Lead,as well as Iron and Manganese in some places.It shows that there are high metal resistance and transferring capacity in some dominant plants,however,the concentrations of their above-ground part haven＇t reached the level for hyperaccumulators.Pteris vittata has the strongest accumulation capacity on Chromium,whose BAC is 2.27,what＇s more,Phragmitas communis Trini,Rhizoma Imperatae,Taraxcum mingolicum and Pteris vittata appear to have good accumulation of Pb and Zn.Planting these plants in heavy metal polluted Pb-Zn mining can eco-reestablish the soil to some extent.

关 键 词：泗顶铅锌矿 重金属污染 综合污染指数 生态恢复 

分 类 号：X820.2[环境科学与工程—环境工程]