【摘要】 中山水库是南京市重要的备用水源地，文中以该水库为研究对象，对其沉积物中重金属的空间分布规律进行研究，运用地积累指数和潜在生态风险指数评估了重金属生态风险等级。结果显示，中山水库各区域沉积物中8种重金属均呈现不同程度的累积。沉积物中Cd、Pb和Cr平均含量分别约为南京市土壤背景值的2.16、1.05倍和1.03倍。其中，Cd的平均质量分数为0.41 mg/kg,明显高于南京市土壤背景值。不同区域重金属与土壤背景值相比的富集系数依次为：库右侧沿线区>东南片区>东北片区>库心区。重金属来源解析结果表明，流域农业生产活动是造成水库重金属污染的主要因素。更多还原

【Abstract】 The Zhongshan Reservoir is an important alternate water source in Nanjing City. In this paper, the distribution pattern of heavy metal in the sediment of Zhongshan Reservoir was introduced, and the ecological risk assessment of heavy metal was carried out by using of the geo-accumulation index and the potential ecological risk index. These results showed that the eight heavy metal accumulated in the sediments of the Zhongshan Reservoir to varying degrees, and the average contents of Cd, Pb and Cr in the sediments were about 2.16, 1.05 times and 1.03 times of the background value, respectively. The average content of Cd was 0.41 mg/kg, which was seriously higher than the soil background value in Nanjing City. The order of the enrichment times of heavy metal in different regions compared to soil background value was: the right side of the reservoir > the southeast area > the northeast area>the central area of the reservoir. Moreover, further analysis of the sources of heavy metals in the sediments of Zhongshan Reservoir revealed that agricultural activities in the watershed were the main cause of heavy metal pollution in the reservoir.更多还原