秋季清水河大型底栖动物群落结构及其水质评价

2011年秋季对云南省清水河流域的15个样点进行了底栖动物调查。共采集到底栖动物33种，隶属于3门6纲。其中水生昆虫17种，寡毛纲4种，软体动物9种，其他动物3种。寡毛类、软体动物和水生昆虫优势类群分别为霍甫水丝蚓、环棱螺和蚋。底栖动物平均密度为31．2ind．／m2，生物量平均值为5．91g／m2。香农一威纳多样性指数为0．99-3．20。采用Hilsenhoff生物指数（BI）对清水河的水质进行评价。结果显示绝大多数河段水质清洁，但支流清平河出现轻微污染。

Community Structure of Zoobenthos and Water Quality Assessment in Qingshui River in Autumn

A zoobenthonic investigation was carried out at the 15 fall of 2011. We have collected 33 species of the benthic macro sampling sites of Qingshui River catchment in the - invertebrates, belonging to 6 classes of 3 phyla Of which, there are 17 aquatic insects, 4 oligochaete, 9 mollusks and 3 other aquatic fauna. The dominant species of Oligochaeta, Mollusea and aquatic insects are respectively Limnodrilus hoffmeisteri, Bellamya sp. and Simuli- idae spp. The average density of these benthic animals was 31.2 ind. /m2, while the average biomass was 5.91 g/ mE. The Shannon - Wiener index was 0.99 - 3.20. The Hilsenhoff＇s Biotic Index （BI） has been used to assess the water quality of Qingshui River. The results indicate that the water is clean in most sampling sections, except its tributary Qingping River, where it is slightly polluted.