红水河龙滩水库浮游动物群落结构特征

2009年夏季和冬季对龙滩水库浮游动物进行了2次调查,共检出浮游动物73属、137种;夏季为100种,冬季为108种;夏季优势种10种,冬季优势种11种,两季共有的优势种为6种。浮游动物平均密度为5 800个/L,原生动物占绝对优势;平均生物量为1.2366 mg/L,轮虫所占比重最大。两季浮游动物现存量无明显差异,但在水平分布上差异显著。依据浮游动物密度聚类分析,龙滩水库各断面浮游动物分为3大类群。龙滩水库成库后,库尾段浮游动物现存量变化较小,坝前、库中明显增加。依据浮游动物生态学指标评价,龙滩水库水质为贫-中营养型。

Constructional Characteristics of Zooplankton Community at Longtan Reservoir of the Hongshui River

A preliminary survey of zooplanktons was made in the summer and winter of 2009 at Longtan Reservoir, and the result indicated that the reservoir harbored 137 species of zooplanktons falling into 73 genus, respectively 100 species in summer with 10 species of dominant species and 108 in winter with 11 dominant species, 6 dominant species in both summer and winter, and that the average density of zooplanktons was 5800 pieces/L, with protozoa in dominant; average biomass is 1. 2366 mg/L, with rotifers in the largest proportion. Zooplankton biomass was of no significant difference in summer and winter; but horizontal distributions varied obviously. A cluster analysis of zooplanktons demonstrated that the reservoir encompassed 3 class groups of zooplanktons at all sections. The standing crop of zooplanktons less varied at the final section of Longtan Reservoir, but significantly rose in front of the dam and in the middle of the reservoir. Evaluation of zooplankton ecological index showed that the water quality at Longtan Reservoir was that of poor - medium nutrition status.