摘要
以陇海铁路圃田段为例,采用Hakanson指数法,对铁路旁土壤重金属（Cd、Pb、Cu、Zn、Cr和N i）的潜在生态风险进行了评价。结果表明,铁路旁土壤中重金属元素出现不同程度富集,以Zn和Pb的积累最为明显,最大含量都分布在距路基30 m范围内。Cd的潜在生态风险最大,在距路基100 m范围内,单项风险系数均在80以上,呈重度风险,最大风险值出现在路基处,高达138,之后逐渐降低;其余重金属呈低风险状态。距路基20 m范围内,潜在生态风险指数均在150以上,达到中等生态风险程度,之后逐渐降低。镉（Cd）的潜在风险占总风险的68.20%-73.37%,其他重金属的贡献很小。
The heavy metals （Cd, Pb, Cu, Zn, Cr, Ni） in roadside soils on Zhengzhou-Putian section of the Longxi Haizhou railway were studied for the potential ecological risk by Hakanson exponential method. The results show that the highest contents of all the six metals distributed within 30 m from the railway, the accumulation of Zn and Pb was obvious. The highest potential ecological risk index of the heavy metals was Cd, its average of Ei was all above 80 within 100 m from the roadbed of the railway, as it has caused serious level ecological risk. The biggest risk index was 138, which was found on the roadbed. While other heavy metals （Pb, Cu, Zn, Cr, Ni） have only caused light level ecological risk. The total risk index （RI） appearing within 20 m from the roadbed is all above 150, and caused intermediate level ecological risk. With the increase of distance from the railway, the index gradually decreased. The total risk index is contributed by the heavy metal of Cd, account for 68.20% - 73.37%, the others are lower.
出处
《气象与环境科学》
2009年第1期29-32,共4页
Meteorological and Environmental Sciences
基金
河南省重点科技攻关项目(0721021500)资助
关键词
陇海铁路
土壤
重金属
潜在生态风险
Longxi - Haizhou railway
soil
heavy metal
potential ecological risk
