桃山水库浮游植物群落结构及水质营养状态评价

2009年的枯水期（5月）和丰水期（7月），在桃山水库对浮游植物结构群落和水质状况进行了调查研究，结合生物监测和理化监测手段，基于浮游植物优势度、丰度、优势度以及综合指数评价方法，对研究水库进行了生态评价。结果显示：（1）桃山水库浮游植物共有7门46属73种及变种，其中以绿藻为主，分别占44 %；（2）生物量在2.29-10.96 mg﹒L-1之间，丰度变幅在(38.76-124.44)×105 ind.﹒L-1之间；（3）枯水期优势种以硅藻为主，丰水期优势种以以蓝藻、绿藻为主；（4）综合营养指数为42.0-60.1。综合评价结果表明：桃山水库枯水期和丰水期水质营养状态为轻富营养化，化学需氧量是影响桃山水库浮游植物群落结构的主要环境因子。

Community Structure of Phytoplankton in Taoshan Reservoir and Trophic State of Water

A survey on the community structure of phytoplankton in Taoshan Reservoir,as well as the physical-chemical indices of water quality,was conducted in May-July,2009 by biological,physical and chemical monitoring.The ecological evaluation of the Taoshan Reservoir was made according to the evaluation criterion of dominance,abundance and integrated trophic state index of phytoplankton.Results showed that:there were 73 phytoplankton species and varieties falling into 46 genera of 7 phyla in Taoshan Reservoir,of which Chlorophyta accounted for the highest ratio of 44%;biomass of different sampling sites varied from 2.29 mg/L to 10.96 mg/L,abundance from 38.76 ×105 to 124.44 ×105 ind/L;dominant species in drought season were Bacillariophyta while those in wet season were Cyanophyta and Chlorophyta;the integrated trophic state indices ranged from 42.0 to 60.1.The water in Taoshan Reservoir is in a state of light eutrophication,and the CODMn is the main influencing factors on the community structure of phytoplankton in Taoshan Reservoir.