密云水库的浮游植物及水体营养程度

Phytoplankton and Nutrient Degree of Water Body in Miyun Reservoir

20 0 0和 2 0 0 1年调查结果显示 ,密云水库库区水体的营养特征为浮游植物响应型 ,浮游植物的群落结构为绿藻 ( 5 1 6% ) -硅藻 ( 2 9 2 % )型。蓝藻门、甲藻门、金藻门、隐藻门、黄藻门分别占 6 1% ,6 0 4% ,3 2 7% ,2 83% ,0 95 %。浮游植物中 ,中营养型指示种占优势 ,但也出现了一些富营养型指示种。 2 0 0 1年浮游植物细胞密度已达到 376 2 0× 10 4个 L ,垂直分布现象比较明显 ,随着水深度的增加 ,细胞密度相应递减。营养状态指数综合评价表明 ,密云水库水体为中 -富营养型 。

According to the survey results in 2000 and 2001,the nutritive peculiarity of water body in Miyun Reservoir belonged to responding type of phytoplankton.The structure of phytoplankton community was of Chlorophyta(51.6%)-Bacillariophyta(29^2%) type.The proportions of Cyanophyta,Pyrrophyta,Chrysophyta,Cryptophyta and Xanthophyta are 6.1%,6.04%,3.27%,2.83% and 0.95% respectively.Among the phytoplankton,the main were middle-nutrition indicator species.But there were some eutrophicational indicator species.In 2000,the cell density of phytoplankton was 376.2×10 4L -1.The phenomenon of vertical distribution of phytoplankton community was very obvious.General tropic state index suggested that water body of Miyun Reservoir already belonged to middle nutrition and there was the tendency of eutrophication.So we should find measures to control its development.