青山水库的浮游植物与营养类型评价

Phytoplankton in Qingshan Reservoir and Assessment of the Eutrophic Level

共鉴定青山水库藻类58属101种，其中有多污水体指示种5种，α－中污水体指示种24种、β－中污水体指示种49种，寡污水体指示种21种。优势种为窄颗粒直链藻（Melosiragranulatavar.angustissima）、颗粒直链藻（M.granulata）和小颤藻（Oscillatoriatenuis）。浮游植物的细胞密度为8.53×107个／L，生物量为16.34mg／L，叶绿素a为16.86mg／m3。根据浮游植物群落结构和水化学分析结果，青山水库已属富营养型水体，并有继续发展的趋势，控制污染，保护水质已刻不容缓。

A total of 101 taxa belonging to 58 genera has been identified in Qingshan Reservior. Amongthem , there are 5 polysaprobic indicator, 24 a－mesosaprobic indicator, 49 b－mesosaprobic indicatorand 21 oligosaprobic indicator species. The dominant spedes are Melosira granulata var. angustissima, M. granuluta and Oscillatoria tenuis. The average biomass of phytoplankton was 16. 49 mg/L, cell density was 9. 91 X 107/L and chlorophyll a was 18. 38 mg/m3. According to the phytoplankton community and the physico－chemical properties of the water, Qingshan Reservoir at present is an eutrophic water body, and the tendency to heavy eutrophication cannot be ignored.