Phytoplankton Community Characteristics and Water Quality Assessment of Douhe Reservoir
陡河水库浮游植物群落特征及水质评价

An investigation was carried out in Douhe Riservoir, a type of high frigid swamp, from December 2008 to October 2009. Douhe Riservoir contains 118 species, 75 genera, and 6 divisions of phytoplankton, among which Chlorophyta is the most important component, accounting for 33.90% of the total. followed by Bacillariophyta with 30.51%. On the three monitoring points of the Douhe Riservoir, the individual phytoplankton density was 5.71×105 ind./L and the biomass was 3.99mg/L . The maximum value of the cell densities was noted in sping. Meanwhile the water quality of the Douhe Riservoir was assessed applying biological methods of assessment for value of indicator organisms, cell density, Shannon-Weaver index, biomass index and the analysis of Phytoplankton,abundance and frequency. The result showed that water body of Douhe Reservoir belonged to middle nutrition.