于枯水期 (冬季和春季 )在官厅水库库区及永定河沿线 1 3个地点采集了表层水样品 ,分别测定了原水和过滤水中 N、P和重金属的含量 ,同时进一步分析了过滤水中不同形态氮的含量 ,初步探讨了枯水期官厅水库和永定河水体 N、P及重金属含量的分布规律及污染特征。研究结果表明 ,官厅水库库区及永定河沿线重金属基本没有污染 ,大多低于地表水 类标准 ,极个别样点超过 类但仍低于 类标准。 N、 P污染比较严重 ,大部分样点的总氮、总磷指标超过湖泊水库 类标准 ,个别样点甚至超过 类标准。不同地点 ,各形态 N的含量有显著差别 ,体现了外源污染的区域分布规律。

samples in water were collected in Guanting Reservoir and Yongdinghe River during low water period (winter and spring). Contents of N, P and heavy metals in original and filtering water were analyzed. Various species of N were also determined. Contents and spatial distribution of N, P and heavy metals were discussed. The results show that heavy metals pollution is very slight. Contents of most kinds of heavy metals are below the level III of surface water standard, and only very few samples go beyond level III, but they are still below level IV. However, N?P pollution are very heavy both in reservoir and along the river. Contents of most samples in Guanting Reservoir exceed the level IV of lake and reservoir water standard. A few of them even exceed level V. In addition, contents of various species of N change with locations. The pollution in Guanting Reservoir is more serious than Yongdinghe River, and the most serious site is located at bridge No.8 and the estuary following it. In all kinds of species of nitrogen, content of ammonia nitrogen is the highest in the reservoir. And particle phosphorous is the main species of phosphorous pollution. The pollution degrees of N and P can reflect the different sources of pollutants.