Abstract: According to the sedimentation, a preliminary assessment was conducted on the polluted standard of the heavy metals in the deposit of the lake, in use of I_geo. The polluted standard of the metals in the deposit is at a very low level. The variance between the particle diameter of the upper and the lower parts of the sediment is the main cause of the changing regularity of the elements.

Key words: Weiminghu Lake, sediments, heavy metal, index of geoaccumulation(I_geo)

摘要： 对北京大学未名湖沉积物中主要重金属含量随深度的变化进行回归分析，应用地积累指数法对未名湖沉积物中重金属污染程度做出影响评价。结果表明：未名湖沉积物中重金属随深度的变化规律主要是与粒径因素相关；沉积物中重金属的污染水平很低，基本属于无污染。

关键词: 未名湖, 沉积物, 重金属, 地积累指数