The planktonic algae and the main physicochemical factors were monitored in the Huairou Reservoir in Beijing City from 2009 to 2010. The results show that the average density of pknktonic algae was 988.16 x 10* ind./L, of which cyanobacteria accounted for 47.0%; three of the dominant populations were eutrophic indicator species, and two were mesotrophic ones; the Shannon-Weaver diversity index was 2.49, and the Pielou index was 0.37, indicating that the water in the reservoir was moderately polluted; and the 1^ index was 49.42, indicating that the water in the reservoir was in a mesotrophic state. The bivariate correlation analysis shows that Chl-a was positively correlated with TN at a high significance level of P < 0.01 and positively correlated with TP at a significance level of P < 0.05. It is pointed out that to control the point source pollution and non-point source pollution in the Huairou Reservoir, the Jingmi Diveision Canal, the Huaisha River, and the Huaijiu River, and to reduce the contents of TN and TP in the water can be considered principal measures against eutrophication in the Huairou Reservoir.%对怀柔水库2009-2010年的浮游藻类及其主要理化指标进行监测,结果显示,库区水体中浮游藻类的平均细胞密度为988.16万个/L,其中蓝藻占47.0％；优势种群中3种为富营养型水体指示种,2种为中营养型水体指示种；库区Shannon-Weaver物种多样性指数为2.49,Pielou指数为0.37,显示库区水体为中度污染；怀柔水库5项理化指标的综合IM指数为49.42,显示库区水体处于中营养状态；相关分析表明,水体中的Chl-a与TN呈极显著正相关(p〈0.01),与TP呈显著正相关(p＜0.05).认为控制和治理怀柔水库水域、京密引水渠、怀沙河、怀九河流域的点源和面源污染,降低水体中的TN和TP含量,是控制怀柔水库水体向富营养化发展的主要方法.
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