人工滩涂湖泊滴水湖浮游藻类群落特征

于2009年3月—2010年2月逐月对中国最大人工滩涂湖泊——滴水湖的浮游藻类群落特征进行研究。利用CANOCO4.5软件对浮游藻类数据和环境因子数据进行典范对应分析(CCA),以揭示浮游藻类对生态环境的响应。结果表明:全年共检测到浮游藻类186种及变种,隶属于8门92属,其中绿藻门种类最多,其次是蓝藻门和硅藻门;主要优势种为小席藻、微小平裂藻、银灰平裂藻、不定微囊藻、弱细颤藻、啮蚀隐藻、四尾栅藻、扁圆卵形藻;藻类的年均丰度和年均生物量分别为(4552.29±4591.33)×104cells·L-1和8.15±6.63mg·L-1,藻类现存量各月份间差异极显著(P<0.01),但站点间差异不显著;多样性分析显示,藻类物种多样性较好;典范对应分析表明,水温、总氮等是影响滴水湖藻类群落结构的主要因素。

Community feature of planktonic algae in artificial beach lake, Dishui Lake

Dishui Lake is the largest artificial beach lake in China.From March 2009 to February 2010,a monthly investigation was conducted on the community feature of planktonic algae in the Lake.Canonical correspondence analysis(CCA) was applied to study the correlations between the algae species diversity and environmental factors by using software CANOCO 4.5,aimed to reveal the responses of the algae community to the ecological environment of the Lake.A total of 186 species and varieties of planktonic algae were detected,belonging to 92 genera of 8 phyla.Chlorophyta had the most species,followed by Cyanophyta and Bacillariophyta.Phorimidium tenus,Merismopedia tenuissima,M.glauca,Microcystis incerta,Oscillatoria tenuis,Cryptomonas erosa,Scenedesmus quadricauda,and Cocconeis placentula were the dominant species.The mean annual abundance and biomass of the planktonic algae were(4552.29±4591.33)×104 cells·L-1 and 8.15±6.63 mg·L-1,respectively.There was a significant difference(P<0.01) in the standing crop of the algae between months,but no remarkable difference was detected among sampling stations.The diversity analysis showed that the species diversity was in good condition,and the CCA analysis indicated that the main factors affecting the community structure of the algae were water temperature and total nitrogen in the Lake.