中文摘要：

为研究引水式小水电对山区河流底栖动物群落结构及多样性的影响，2011年6月对重庆东河白里电站和红花电站库尾上游河段、库区河段、引水坝下减水河段、电站出水口上游河段、电站出水口下游河段的底栖动物进行调查。调查共采集到大型底栖动物43种，隶属3门4纲30科。结果表明：各河段底栖动物群落结构差异不大，蜉蝣目、毛翅目昆虫为优势类群，各河段水质并无明显差异；库区河段受泥沙淤积影响，降低了生境多样性和异质性，底栖动物密度、生物量和多样性指数显著低于电站出水口下游河段；坝下河段流量减少，生境适宜性降低，底栖动物密度、生物量和多样性明显降低。

英文摘要：

In order to explore the influence of small diversion type hydropower stations on macroinvertebrates community and diversity, macroinvertebrates of five river reaches （ upstream of reservoir , reservoir, downstream of the dam and downstream of the station ） of Baili and Honghua stations on Dong River located in Chongqing , China were investigated in June of 2011 .Our results indicated that forty-three species were collected in the survey , subordinating to thirty families , four classes and three phylums .The influences of two small diversion type hydropower stations on macroinvertebrates were not obvious and Ephemeroptera or Trichoptera were still the dominant taxon in all the sampled river reaches .As a conse-quence of sediment deposition , water depth of the reservoir was shallow and its flow pattern was still lotic , which was quite different from that of large dams .Component of macroinvertebrate community in the reservoir was not significantly different from the reaches unaffected by the dam , but the density , biodiversity and biomass were significantly depressed as a result of the loss of habitat diversity and heterogeneity .Mean water width, depth, speed and discharge of the reach in the down-stream of the dam were significantly depressed by water diversion and macroinvertebrates here exhibited lower density , biodiversity and biomass .