陕西省泾惠渠灌区土壤重金属污染潜在生态风险评价

易秀; 谷晓静; 侯燕卿; 刘秀花; 谢娟

易秀,谷晓静,侯燕卿,刘秀花,谢娟.陕西省泾惠渠灌区土壤重金属污染潜在生态风险评价[J].干旱地区农业研究,2010,28(6):217~221

陕西省泾惠渠灌区土壤重金属污染潜在生态风险评价

Evaluation on potential ecological risk of heavy metals in soils of Jinghuiqu irrigation district of Shaanxi

DOI：10.7606/j.issn.1000-7601.2010.06.39

中文关键词: 土壤重金属潜在生态风险评价泾惠渠灌区

英文关键词:heavy metal evaluation of potential ecological risk Jinghuiqu irrigation district of Shaanxi

基金项目:高等学校学科创新引智计划项目资助(B08039)；陕西省水利厅重点项目

作者	单位
易秀	长安大学环境科学与工程学院,陕西西安 710054
谷晓静	西安市环境保护科学研究院,陕西西安 710002
侯燕卿	长安大学环境科学与工程学院,陕西西安 710054
刘秀花	长安大学环境科学与工程学院,陕西西安 710054
谢娟	长安大学环境科学与工程学院,陕西西安 710054

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中文摘要:

在调查研究泾惠渠灌区土壤重金属污染现状的基础上,以Hg、Cd、Cr、Pb、As、Cu、Zn 7种重金属元素为指标,利用土壤重金属污染潜在生态风险指数法对土壤重金属生态危害程度进行了评价。结果表明,灌区部分土壤重金属生态危害程度都为轻度,个别采样点为中等;从重金属的种类看,只有Cd和Hg的值大于40,生态危害程度为中度,其余元素都为轻度;7种重金属潜在生态危害程度依次为Hg>Cd>As>Pb>Cu>Zn>Cr。重金属潜在生态危害指数RI平均值为133,土壤重金属潜在生态危害为轻度。从不同的土壤重金属综合污染评价方法看,内梅罗综合污染指数(P)和潜在生态风险指数(RI)的评价结果具有很高的一致性,达到极显著的相关关系(R²=0.9313,P<0.01)。

英文摘要:

On the basis of investigating current situation of heavy metals pollution in soil in Jinghuiqu imrigation dis- trict of Shaanxi province, Hg, Cd, Cr, Pb, As, Cu and Zn are used as evaluation indicators, and soil quality of the imi- gation district is evaluated by potential ecological risk indexes of heavy metals . The conclusions have been reached that the degree of ecological hazard of heavy metals in the soil of Jingyang, a part of the irrigation district, is at light level. Besides a few sampling sites with a moderate level , the other parts of the irrigation district have a light level of ecological hazard of heavy metals. Among the heavy metals, only E, of Cd and Hg is more than 40 and the degree of ecological haz-ard is at a moderate level, while that of the rest is at a light level . The order of pollution degree of seven heavy metals is Hg>Cd>As>Pb>Cu>Zn>Cr. The average potential ecological risk index of seven heavy metals is 133, which shows that the degree of ecological hazard is in a light level in the whole irrigation district . Comparing different compre-hensive evaluation methods of soil quality，Nemerow integrated polluted index and the potential ecological risk index has a high consistency, and the correlation reaches a highly sigificant level (R²=0.9313,P<0.01).

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