大型热带水库-松涛水库枯水期浮游植物群落特征

松涛水库是一个大型热带水库,分为两个主要水域:番加洋和南丰洋,2003年12月对该水库的这两个水域的浮游植物进行采样,共发现7门65种藻类。松涛水库番加洋库区水体的浮游植物总细胞密度为1.08×10⁶cells·L^-1,主要种类组成为蓝藻(Cyanophyta)-绿藻(Chlorophyta)型。松涛水库南丰洋库区水体的浮游植物群落为细胞密度为1.14×10⁶cells·L^-1,主要种类组成为绿藻(Chlorophyta)-硅藻(diatom)型。松涛水库库区水体总体已为避-富营养,其中富营养型浮游植物指示种类有:铜绿微囊藻(Microcystis aeruginosa Kütz.),针状蓝纤维藻(Dactylococcopsis acicularis),镰形纤维藻(Ankistrodesmus falcatus),小环藻(Cyclotella menighiniana),模糊直链藻(Melosira spp.)等。与亚热带和温带的水库比较,处于热带地区的松涛水库浮游植物,在湖泊区微囊藻等适应高温高光强的种类具有更高的细胞密度。松涛水库河流区最主要的优势种是硅藻门的针杆藻。

Phytoplankton Distribution in a Tropical Reservoir (Songtao reservoir) in Dry Season of 2003

Songtao Reservoir is a large tropical reservoir in Hainan province of China, it is divided into two domains:Fanjiayang and Nanfengyang. Phytoplankton were sampled for quantitative and qualitative analysis. A total of 65 algal species belonging to seven phyla were observed. The total phytoplankton abundance was 1.08×10⁶ cells·L^-1 in the Fanjiayang, and it was mainly composed of Cyanophyta and Chlorophyta. The phytoplankton abundance of Nanfengyang was 1.14.×10⁶ cells·L^-1, and it was mainly composed by Chlorophyta and Diatoms. The reservoir was mesotrophic, it was indicated by the following species:Microcystis aeruginosa Kütz, Merismopedia elegans, Dactylococcopsis acicularis, Ankistrodesmus falcatus, Cyclotella menighiniana and Melosira spp. The abundance of Microcystis sp. in the lacustrine zone of Songtao reservoir was higher than that of reservoirs in sub-tropic and temperate regions. The phytoplankton in the riverine zone of Songtao Reservoir was dominated by Synedra spp.