摘要
采用现场采样、室内分析方法,研究调查了广西泗顶铅锌矿周边土壤及该区14种优势植物重金属含量,采用Hakanson潜在生态危害指数法评价了土壤中重金属的潜在生态危害。结果显示,铅锌矿区土壤已受到Pb、Zn的严重污染,矿区土壤中的Pb、Zn潜在生态危害指数大于320,为极强生态危害,Cu、Cr的潜在生态危害指数都小于40,为轻微生态危害。分析表明,采矿冶炼活动对矿区重金属含量和分布有很大影响,Pb-Zn、Pb-Cu的同源性很高,Cr则表现出不同于其他元素的积累特征。矿区14种优势植物对Pb、Zn、Fe、Mn、Cu、Cr有不同程度的吸收,但植物地上部的重金属含量均未达到超积累植物所规定的临界值,其中芦苇、白芒、蒲公英、蜈蚣蕨对Pb、Zn有较好的富集特性,可以作为潜在的Pb和Zn污染修复物种。
Soils and dominant plants were surveyed and studied in the Siding mine area. Based on the determination of heavy metal concentration of soil from 8 sections and 14 dominant plant species in different parts, the potential ecological hazard was assessed using the Hakanson Index Method. The results indicated that the soil of Siding mine area was seriously contaminated by Pb and Zn.The Er^i values of Pb and Zn were higher than 320, and the degree of ecological hazard was extremely high, while the Er^i values of Cu and Cr were lower than 40, the degree of ecological hazard was low. Statistical analyses showed that mining and smelt activities had a great influence on the content and distribution of heavy metals. Pb-Zn and Pb-Cu were likely from a same source, while Cr had a different cumulating character. Furthermore, had Pb, Zn, Fe, Mn, Cu and Cr in 14 dominant plant species at defferent levels, but they had not reached the level for hyperaccumulators. Among all the dominant plants, Phragmites australis （Car.）Trin. ex Steud., Imperata cylindrica（ Linn. ）Beauv., Herba Taraxaci and Pteris vittata L. appeared to have good accumulation of Pb and Zn, and would be very useful in the restoration of Pb and Zn polluted areas.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2008年第6期2158-2165,共8页
Journal of Agro-Environment Science
基金
国家自然科学基金(30560032)
广西自然科学青年基金项目(桂科青0640071)
广西科学研究与技术开发计划课题(桂科攻200803-1)
广西环境工程与保护评价重点实验室与广西高校人才小高地建设创新团队资助计划项目
关键词
重金属污染
生态风险
超富集植物
铅锌矿区
heavy metal pollution
ecological risk
hyperaccumulator
siding Pb-Zn mine area
