摘要:

It is of great significance to evaluate the heavy metal pollution of soil in the water source protection area. Taking Miyun Reservoir water source protection area as the research object,223 soil surface samples were collected from Miyun Reservoir water source protection area,and the contents of 8 heavy metals (Pb,Ni,Cu,Cr,Zn,Cd,Hg and As) were determined. The results showed that the average content of Hg and As in the overall study area were lower than the background value of Beijing soil,and the average content of the other 6 heavy metals were higher than the background value of Beijing soil. Soil heavy metal pollution degree and potential ecological risk were evaluated by the geo-accumulation index and potential ecological risk index,and the possible sources of heavy metals were analyzed. The standard rate of soil heavy metals in the study area was about 83%,and the risk of agricultural soil pollution was low. Cr and Cd in the study area were in the state of no-medium pollution,and the other 6 heavy metal elements were in the state of no pollution. The ecological hazard of Cd was moderate,and the other 7 heavy metal elements were slight,and the overall ecological hazards of the study area was moderate. Based on the analysis of heavy metal pollution and ecological risk in Miyun Reservoir water source protection area,reference for the prevention and control of heavy metal in soil and the protection of water source area in Beijing water source protection area were provided.评价水源保护区土壤重金属污染状况具有重要意义。以密云水库水源保护区为研究对象,采集223个表层土壤样品,测定了Pb、Ni、Cu、Cr、Zn、Cd 、Hg和As 8种重金属的含量。结果表明,整个研究区Hg、As的平均含量低于北京市土壤背景值,其余6种重金属平均含量均高于北京市土壤背景值。采用地累积指数法和 潜在生态风险指数法评估土壤重金属污染程度和潜在生态风险,并分析了重金属的可能来源。研究区内土壤重金属达标率约83%,农用地土壤污染风险低。研究区 Cr和Cd处于无-中污染状态,其余6种重金属元素处于无污染状态;Cd生态危害中等,其余7种重金属生态危害轻微,研究区整体生态危害中等。分析密云水 库水源保护区土壤重金属污染及其生态风险,能为北京市水源保护区土壤重金属污染防治与水源地保护提供参考依据。

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Times Cited: 01