密云水库内湖土壤重金属含量分析

Heavy metal accumulation in littoral zone soil of Miyun reservoir inner lake

为了揭示密云水库不同蓄水位条件下消落带重金属污染状况,以生态环境相似的内湖为研究对象,将消落带划分为133~137 m、137~142 m、142~146 m及146~152 m等4个高程范围,开展土壤重金属及植被类型现状调查,分析76个采样点土壤样品中铜、锌、铅、镍及铬等5种重金属元素的含量。研究了相应高程范围内,5种重金属在农作物、乔灌木及草地等3种不同植被类型区含量特征。单因子污染指数法和内梅罗综合污染指数法分析表明:密云水库内湖消落带5种重金属元素含量及整个调查区域均符合该区域土壤环境质量要求。

In order to reveal the status of heavy metal pollution in the littoral zone of Miyun reservoir at different water levels, the littoral zonewas divided into four elevation ranges： 133-137m, 137-142m, 142- 146m and 146-152m to carry out the status of heavy metalin soil and vegetation types. The contents of five heavy metal elements i.e. Cu, Zn, Pb, Ni and Cr in 76 soil samples were investigated and analyzed. The conclusions were as follows： the contents of heavy metals in soils varied with elevation, and the contents of five heavy metals in the same elevation were different. The contents of heavy metals in soils differed in different vegetation types. The single factor pollution index method and the Nemero comprehensive pollution index method all showed that the content of five heavy metal elements and the surveyed area all conformed to the requirements of soil environmental quality in this area.