峡江枢纽库区水生生物调查及水质评价

Survey on Aquatic Organisms in Xiajiang Reservoir and Water Quality Assessment

对峡江水利枢纽施工期间库区7个监测断面的水生生物及水质进行了研究。结果表明,库区水体中浮游动物共4大类27种,以轮虫类为优势种,占总数的40.74%;浮游植物8门50种,硅藻以占种数的60.00%和占种数22.00%的绿藻位居生物量的前两位;底栖动物在枯水期与丰水期时空分布变化明显,临近坝址段的水体底栖动物密度与生物量较大,同时由于水流在调查范围内变化较大,而水流过急以及卵石为主的底质,导致个别调查点未检测出底栖动物;对水质样本采样内梅罗指数计算分析,在将水污染指标按用途分三大类的条件下,监测点基本处于污染水平。其中ST5的内梅罗综合污染指数等于2.14,呈最高水质污染水平。

Studied aquatic organisms and water quality of 7 monitoring sections in the reservoir area of Xiajiang Water Control Water Reservoir Construction. The results showed that there were reservoir 4 categories 27 kinds zooplankton in the reservoir water body, the rotifers were the dominant species, accounting for 40.74% of the total. Phytoplankton had 50 species belonging to 8 phylums. Diatoms accounted for 60.00% of the total, the Chlorophyta accounted for 22.00% of the total, among the top two. Spatial and temporal distribution of benthic animals changed significantly in the dry season and wet season, density and biomass was larger of benthic animals near the dam water body segment, and at the same time due to the large variation of flow within the scope of the investigation, and water flow was too hasty and cobble dominated sediment, resulting in individual survey did not detect benthic animals. Calculation and analysis water sample using Nemerow index, the water pollution index was divided into three categories according to application, water quality in monitoring points was pollution. Among the ST5 Nemero′s comprehensive pollution index is equal to 2.14, the highest level of water pollution.ST5′s Nemerow pollution index was equal to 2.14, as the highest level of water pollution.