安邦河湿地夏季浮游植物集群划分

Phytoplankton assemblage classification in Anbang River wetland in summer

2005年夏季对安邦河湿地进行浮游植物调查,运用多元分析方法对其组成、分布、群落进行了研究。共采到浮游植物7门82种,其中绿藻44种,蓝藻19种,硅藻12种,其它7种;浮游植物数量为268.45×104ind.L-1,优势种共6种,其中蓝藻3种,硅藻2种,绿藻1种。多元分析表明,夏季安邦河湿地浮游植物可划分为3个集群:核心区的四角盘星藻Pediastrungolaum tetras集群(PPP)、沿岸的鱼腥藻Anabaena sp.-铜绿微囊藻Microcystis aeruginosa-梅尼小环藻Cyclotella meneghiniana集群(AMC)和莲花池的银灰平裂藻Merismopedia glauca集群(MMM)。各集群的指示种反映了各集群营养水平的差异,与各站位的地理位置相关。

An investigation on the phytoplankton was carried out in Anbang River wetland from ten localities in summer 2005. Phytoplankton species composition and assemblage classifications were analyzed by multivariate analyses, including cluster analysis and metric multidimensional scaling analysis （MDS）. A total of 82 species were found, belonging to Chlorophyta （44）, Cyanophyta （19）, Bacillariophyta （12）, Xanthophyta （2）, Chrysophyta （2）, Cryphophyta （2）, and Euglenophyta （1）. The average abundance was 268.45 × 10^4ind·L^-1 , and the predominant phytoplankton species were Anabaena sp. , Merismopedia glauca, Microcystis aeruginosa, CycloteUa meneghiniana, Fragilaria capucina and Pediastrum tetras. Based on the Bray-Cartis similarity matrix calculated according to species abundance of each locality, hierarchical cluster and MDS analysis showed that three assemblages can be distinguished and named by representative and dominant species： （i） Anabaena sp. -M. aeruginosa-C. raeneghiniana assemblage （AMC）, with represent- ative species of Anabaena sp. , Aphanizomenon flos-aquae, M. aeruginosa, C. meneghiniana, Synedra acus, Chlaraydomonas olifanii, Scenedesraus arc uatus, S. bijuga, and Cryptomonas marssonii, located in coast, （ii） Pediastrum tetras assemblage （PPP） in the center of wetland with representative species of P. boryanura, P. tetras, Staurastrura crenulatura, and Xanthidiura sp. , and （iii） M. glauca assemblage （MMM）, with representative species of M. glauca , Chroraulina pascheri , Closteriura gracile , Cosmaririum sp. , Hyalotheea dissiliens, and P. biradiatura in the lotus flower pond. The representative species of phytoplankton demonstrated the differentiation of nutrition in sampling localities, thus associating with the geographical locations.