亚热带大型水库——新丰江水库的浮游生物群落特征

于2000年丰水期和枯水期，调查了新丰江水库的浮游生物群落结构，新丰江水库处于贫营养状态，浮游生物密度和生物量均较低。浮游植物34种，丰水期以蓝、绿藻为主，分别占总数量的31.7%和36.8%，蓝藻、绿藻细胞微小，chl.a量未占优势；枯水期硅藻为优势种群，占63.9%，浮游生物22种，丰水期轮虫为主，占65.3%，枯水期桡足类占81%，丰水期动物密度较高，但丰水期以轮虫如螺形龟甲轮虫为主，枯水期以无节幼体，桡足幼体及广布中剑水蚤居多，因此枯水期生物量高于丰水期。

Plankton community in a subtropical large reservoir (Xinfengjiang reservoir)

The plankton composition and distribution were investigated in Xinfengjiang reservoir in flood and dry seasons of 2000. It was oligotrophic with low density and richness of phytoplankton and zooplankton. 34 species of phytoplankton and 22 species of zooplankton were observed in the reservoir, but fluctuated seasonally. Phytoplankton was predominated numerically by Cyanophyta and Chlorophyta which were 31.7% and 26.8% of the total amount respectively in the flood season and then by Bacillariophyta with 63.9% . In the dry season, Keratellca cochlearis predominated numerically in the flood season and then Mesocyclops leuckarti and its copedid and nauplii in the dry season, and though the abundance of zooplankton was a little higher in flood season than in dry season, the biomass was much higher in the dry season than in the flood season.