广东省典型水库浮游植物组成与分布特征

在２０００年的丰水期（６—７月份）和枯水期（１１—１２月份）分别对广东省１９个大中型水库的浮游植物进行采样调查。一共发现有７门８９属１４２种的藻类。其中绿藻８４种，硅藻２５种，蓝藻１９种，裸藻９种，甲藻和金藻各两种以及隐藻１种。水库的主要优势种为蓝藻或硅藻。藻类的细胞密度和叶绿素含量从水库上游到水库下游依次降低。丰水期的藻类丰度要高于枯水期。绝大多数水库在丰水期优势种为蓝藻，而在枯水期的优势种为硅藻。人为导致的水量增减会对季节性变化造成影响。从空间分布上看，每西和珠江三角洲地区主要优势种为蓝藻，而每东地区和东江、韩江流域的主要优势种为绿藻，北江流域的各种类组成比较均匀。

Phytoplankton Composition and Distribution in Typical Reservoirs of Guangdong Province

Nineteen reservoirs in Guangdong province were sampled in June and December in 2000, roughly corresponding to the flood and dry seasons. A total of 142 species of phytoplankton belonging to 89 genera in 7 phyla were observed.They were as follows: 84 chlorophyta, 25 Bacillariophyta, 19 Cyanophyta, 9 Euglenophyta, 2 Pyrrophyta and Chrysophyta and only 1 Cryptophyta was found. The dominant species in the reservoirs were either Cyanophyta or Bacillariophyta. The cell density and chlorophyll concentration in the reservoirs located upstream were lower than in the downstream reservoirs. The abundance of species found were greater in the flood season than in the dry season. In most of the reservoirs, phytoplankton were dominated numerically by Cyanophyta in the flood season, and by Bacillariophyta in the dry season. The change in water volume by regulation could influence the seasonal variation. The dominant species of Cyanophyta were found in the west coastal area and Zhujiang delta; while the dominant species of chlorophyta were fonnd in the eastern coastal area as well as Dongjiang and Hanjiang watershed.