中国生态农业学报 2008 年 11 月 第 16 卷 第 6 期 Chinese Journal of Eco唱 Agriculture,Nov.2008,16(6) :1517唱 1522
DOI: 10. 3724 / J. SP. 1011. 2008. 01517

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辽宁省污灌区土壤重金属污染特征与生态风险评价
李名升 佟连军
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(1. 中国科学院东北地理与农业生态研究所 长春 130012; 2. 中国科学院研究生院 北京 100049) 摘 要 针对当前污灌区土壤污染研究中存在的问题,提出了一种模糊识别模型评价土壤综合环境质量,并 对潜在生态风险指数法进行改进,用以计量重金属潜在生态风险. 采用建立的方法对辽宁省污灌区土壤环境 质量和重金属潜在生态风险进行了评价,结果显示:Cd 是辽宁省污灌区首要重金属污染物,而 Hg,Pb,Ni 污染 较为普遍;重金属的来源主要是灌溉污水和农田施肥;以工业废水为灌溉用水的灌区污染情况比以河水为灌
重金属污染,且具有较为明显的复合型污染特点,其潜在生态风险超出警戒水平,各灌区应根据各自污染特点 和风险等级制定相应的污染防治对策. 关键词 辽宁省 污灌区 模糊识别模型 潜在生态风险 土壤重金属污染 毒性系数 中图分类号:X820. 4 文献标识码:A 文章编号:1671 - 3990(2008)06 - 1517 - 06
潜在生态风险从大到小则依次为:Cd >Hg >Pb >Cu >Ni >As >Cr. 总体来看,辽宁省污灌区存在一定程度的
溉用水的灌区污染严重;污灌区重金属元素污染程度大小依次为:Cd >Pb >Ni >Hg >Cu >Cr >As,而重金属
Specificity and ecological risk of heavy metal pollution in Liaoning sewage irrigation district
(1.Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun 130012, China; 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China) Abstract To address the problems of sewage irrigation, fuzzy recognition model was developed to evaluate sewage irrigated soil environment quality, heavy metal pollution characteristics and potential ecological risk of Liaoning sewage irrigation district were evaluated by the established model.Results show that the primary contaminant in sewage irrigation districts of Liaoning Province
LI Ming唱 Sheng , TONG Lian唱 Jun
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environmental quality and improve potential ecological risk index used to assess potential ecological risk of heavy metals.The soil is Cd, whereas Hg, Pb and Ni constitute pervasive pollutants.Correlation analysis indicates that wastewater irrigation and fertili唱 is: Cd > Pb > Ni > Hg > Cu > Cr > As; and that for potential ecological risk is: Cd > Hg > Pb > Cu > Ni > As > regions irrigated with industrial wastewater than in regions irrigated with river water.The order of heavy metal pollution intensity zation of farmland are the main sources of heavy metal pollution in Liaoning sewage irrigated soils.Pollution is more serious in the

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