【摘要】 研究了2007年太湖五里湖浮游植物的生态学特征.结果表明:五里湖共检出浮游植物8门123种;其中绿藻种类最多,共57种,占浮游植物总种数的46.3%;硅藻次之,共23种,占浮游植物总种数的18.7%;浮游植物种数以冬春季多、夏秋季少.调查期间,浮游植物数量和生物量分别变化在386.2×104-5581.9×104cells/L和0.541-3.491mg/L,均以绿藻最高;浮游植物数量的季节变化表现为夏季>春季>秋季>冬季;且除绿藻外,浮游植物的季节演替规律与PEG模型基本一致.相似性分析显示,五里湖1、3、4、5月份的生境相似,6、7、8、9、11月份的生境相似.优势度分析显示,五里湖各个月份的浮游植物优势种都在2种以上,优势种主要有小球藻(Chlorell avulgaris)、小球衣藻(Chl.amydomonas microsphaera)、尖尾蓝隐藻(Chroomonas acuta)、铜绿微囊藻(Microcystis aeruginisa)等14种,优势种种数较多且优势度不高,变化在0.02-0.78之间;多样性和均匀度分析显示,五里湖浮游植物多样性指数和均匀度指数分别变化在1.5-2.7和0.26-0.59之间,多样性和均匀度都较好;表明2007年五里湖浮游植物群落结构比较复杂、处于较完整状态.更多还原

【Abstract】 This paper was studied the eco-characteristics of phytoplankton in Lake Wuli, Lake Taihu in 2007. The results showed that 8 classes including 123 species have been founded in Lake Wuli. Among them, dominated Chlorophyta has 57 species, accounting for 46.3% of the total phytoplankton species, and Bacillariophyta has 23 species, taken the second place, accounting for 18.7% of the total phytoplankton species. There were much more species in winter and spring than that in summer and autumn. The quantity and biomass of phytoplankton in Lake Wuli in 2007 ranged from 386.2×104 to 5581.9×104cells/L and 0.541 to 3.491mg/L, respectively. Dominated class both in quantity and biomass was Chlorophyta, then was Cyanophyta, and the third was Cryptophyta. The quantity of phytoplankton in the order from large to small was: Summer>Spring>Autumn>Winter. Seasonal succession of phytoplankton was consistent with rule of PEG (Plankton Ecology Group) model except Chlorophyta. The analysis results of similarity showed that the eco-environment of Lake Wuli in January was similar to that on March, April and May, and the eco-environment in June was similar to that in July, August, September and November. The analysis result of the predominance index showed that there were 14 predominant species including Chlorella vulgaris, Chl.amydomonas microsphaera, Chroomonas acuta, Microcystis aeruginisa in 2007 in Lake Wuli, and the numbers of predominant species were all more than two species in every month. Furthermore, the predominant indexes were not high, ranging from 0.02 to 0.78. The analysis results of diversity and uniformity showed that the diversity index ranged from 1.5 to 2.7 and uniformity index from 0.26 to 0.59, respectively, which meant that both diversity and uniformity of phytoplankton were good status in the lake. It could be concluded that the phytoplankton community structure in Lake Wuli was complex in the ecosystem.更多还原