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中国农学通报

中国农学通报 ›› 2013, Vol. 29 ›› Issue (35): 281-288.doi: 10.11924/j.issn.1000-6850.2013-1449

所属专题： 土壤重金属污染； 农业生态

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

宁夏黄河流域湖泊湿地底泥重金属污染特征及生态风险评价

朱嵬 李志刚 李健 李昌晓 李志军 杨艳梅   

  • 收稿日期:2013-05-22 修回日期:2013-06-07 出版日期:2013-12-15 发布日期:2013-12-15
  • 基金资助:
    宁夏黄河流域生态体系优化构建技术合作研究

Pollution Characteristics and Potential Ecological Risk Assessment of Heavy Metalsin the Lake Wetlands in the Yellow River Valleys of Ningxia

zhu wei   

  • Received:2013-05-22 Revised:2013-06-07 Online:2013-12-15 Published:2013-12-15

PDF (PC)

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摘要： 为了掌握宁夏黄河流域湖泊湿地底泥中重金属的污染概况及潜在生态危险，笔者调查了该流域9个湿地底泥中重金属(As、Cd、Cr、Cu、Hg、Ni、Pb、Zn)的含量与富集情况，分别以现代工业化前正常颗粒底泥中重金属含量的最高背景值和自然背景值为参比值，对湿地底泥中重金属的富集系数和生态危害系数以及各采样点的生态危害指数进行探讨，并利用Lars Hankanson潜在生态危害指数法对湿地底泥中重金属的生态危害进行评价。结果表明：以现代工业化前正常颗粒底泥中重金属含量的最高背景值为参比值，宁夏黄河流域湖泊湿地重金属富集顺序为：Cr>Pb>Zn>Cu>As>Cd>Hg，各重金属单因子生态危害程度为：Cd>As>Hg>Pb>Cu>Cr>Zn，鹤泉湖底泥重金属潜在生态危害程度相对最高，其他湖泊重金属生态危害都比较轻。总体而言，宁夏黄河流域湖泊底泥重金属生态危害程度还是较小的。

关键词: 试验, 试验

Abstract: In order to investigate heavy metal pollution and its potential ecological risk in sediments of lake wetlands of the Yellow River Valleys of Ningxia, concentration and accumulation of heavy metals (As, Cd, Cr、Cu, Hg, Ni, Pb, Zn) in lake wetlands of the Yellow River Valleys of Ningxia were investigated. The highest values for heavy metals concentrations in sediments before the modern industrialization of the world and the environmental background values of lake wetlands of the Yellow River Valleys of Ningxia were used to analyze the accumulation coefficient and potential ecological risk (PER) coefficients for heavy metal. The PER index for each sample location was also discussed. The method for evaluating PER index presented by Lars Hankanson was applied to assess the ecological risk. The results showed that when the highest values for heavy metals concentrations in sediments before the modern industrialization of the world were taken as references, the accumulation order for those heavy metals was Cr>Pb>Zn>Cu>As>Cd>Hg, the potential risk order of elements was Cd>As>Hg>Pb>Cu>Cr>Zn. Hequan Lake was under the highest potential risk, Qingtongxia wetland ranked the second, while the others had relatively small risk. But, overall, the potential ecological risk of investigated lake wetlands in the Yellow River Valleys of Ningxia was light, at least not very serious.