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中国农学通报

中国农学通报 ›› 2010, Vol. 26 ›› Issue (10): 314-318.

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

太原市敦化污灌区重金属污染的潜在生态风险评价及垂直分布特征

陈翠翠1,梁锦陶1,韩玉兰2,成昌顺2,罗玉2,陈启斌1,梁镇海1   

  • 收稿日期:2009-12-08 修回日期:2009-12-31 出版日期:2010-05-20 发布日期:2010-05-20
  • 基金资助:

    污水灌溉对土壤环境的影响及其防治技术研究

Potential Ecological Risk Assessment and Vertical Pollution Characteristic of Heavy Metals in Dunhua Sewage Irrigation Area of Taiyuan City

Chen Cuicui1, Liang Jintao1, Han Yulan2, Cheng Changshun2, Luo Yu2, Chen Qibin1,   

  • Received:2009-12-08 Revised:2009-12-31 Online:2010-05-20 Published:2010-05-20

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摘要：

本文以太原市敦化污灌区农田土壤为研究对象，在灌区内共采集到表层样品185个及不同深度土样90个，采用原子吸收和原子荧光分光光度法测定其重金属Hg，Cd和Cr的含量，并根据Hakanson潜在生态风险指数法对三种重金属的潜在风险进行评价，同时对不同深度土壤重金属的迁移及污染程度进行了讨论。实验结果表明：灌区土壤属弱碱性，平均pH值为8.01；土壤有机质在表层含量较高（>1%），随深度增加含量减少；长期的污水灌溉导致了灌区农田土壤中Cd的严重污染，平均含量高达1.265mg/kg，是国家二级标准值的2.11倍，Cd污染是造成土壤风险的主要因子。Hg，Cd和Cr的综合风险指数RI分布在475.769到610.187之间，污染程度很强，其中Cd的潜在风险占总风险的68.4%-74.6%，Cr和Hg的贡献率较小。剖面土壤中的重金属含量与深度成递减的指数分布关系，与有机质的变化规律一致。

关键词: 香蕉, 香蕉, NBS-LRR, 同源克隆技术, 抗病基因同原序列, 水杨酸

Abstract:

Surface soil samples(185)and different depth of 20,40,60,80,100and 120cm samples(90) was collected in agricultural soils of Dunhua sewage irrigation area, the heavy metals (Cd，Cr，Hg) were determined by AAS and AES. Hakanson ecological risk method was used to assessment the potential ecological risk of heavy metals,and the vertical distribution and migration of heavy metals were discussed. The results showed that: Irrigated soil is alkaline (pH=8.01), The long-term sewage irrigation led to serious contamination of Cd with average content up to 1.265mg/kg, it was 2.11 times of the national standard value, pollution of Cd is the main factor causing the risk of soil. The comprehensive risk index RI distributed in 475.769 to 610.187, belong to a strong degree of pollution. The total risk index is contributed by heavy metal Cd, account for 68.4-74.6%, the other are lower. The organic matter tend to be concentrated in the cultivated horizon(>1%), and content tends to decrease with the depth;The relationship between heavy metals and the depth obey exponential distribution, consistent with the changes of organic matter.