| 摘要: |
| ［目的］通过测定秦巴山区巴中市农田土壤中镉（Cd）、铅（Pb）、锌（Zn）3种重金属元素的含量及分布特征，为农田重金属防治科学决策的制定提供数据支撑。［方法］文章采用内梅罗指数和潜在生态风险指数来综合评价巴中市土壤重金属污染状况。［结果］巴中市农田土壤锌平均含量比四川省丘陵地区背景值高6.78%，而镉和铅含量均未超出其背景值，总体评价良好，但各检测点之间差异较大，镉含量最多超出背景值5.7倍。内梅罗指数评价结果显示，全市平均综合污染指数为1.10，接近清洁状态。潜在生态风险指数评价结果显示，其最小值为15.94，最大值为177.74，平均值为35.38。［结论］巴中市农田土壤重金属污染状况基本处于低度风险级别，但各地块污染程度不尽一致，应因地制宜，采取适当措施治理土壤污染。 |
| 关键词: 土壤 重金属 内梅罗指数 潜在生态风险指数 巴中市 |
| DOI： |
| 分类号:S153 |
| 基金项目:陕西省土地工程建设集团内部科研项目“毛乌素地区砒砂岩与风沙土混合介质水分特性及其运移规律研究”（DJNY2017-23） |
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| DISTRIBUTION AND ECOLOGICAL RISK ASSESSMENT OF HEAVY METALS IN FARMLAND SOILS IN BAZHONG |
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Shi Lei1,2,3,4
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1.Shanxi Provincial Land Engineering Construction Group Co., Ltd, Xi'an 710075, China;2.Institute of Land Engineering and Technology, Shanxi Provincial Land Engineering Construction Group Co., Ltd., Xi'an 710075, China;3.Key Laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of Land and Resources, Xi'an, Shanxi 710075, China;4.Shanxi Provincial Land Consolidation Engineering Technology Research Center, Xi'an 710075, China
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| Abstract: |
| Aiming at providing a scientific basis for the prevention and control of soil pollution in Bazhong, based on the determination of the content and distribution characteristics of Cd, Pb and Zn in farmland soil, this paper conducted a comprehensive evaluation on the contamination status of heavy metal in Bazhong using Nemerow index and potential ecological risk index. The results showed that the average content of Zn in farmland soils in Bazhong was 6.78% higher than the background value of hilly area in Sichuan, while the other two, Pb and Cd, were under the standard line. However, there were some differences among various sampling places. The contents of Cd could reach 5.7 times higher than background value in some places at most. Nemerow index showed that the heavy metal pollution index of the soils of Bazhong was 1.10, which was closed to the clean state. The evaluation results of potential ecological risk index showed that the minimum value was 15.94, the maximum value was 177.74, and the average value was 35.38. Basically, Bazhong was at a low level of risk according to the potential ecological risk index. However, there was a big difference in the content of elements between samples, indicating that the pollution levels were not the same everywhere, so we should adopt appropriate measures to deal with soil pollution. |
| Key words: soil heavy metal Nemerow index Potential ecological risk index Bazhong |
