人工阶梯 深潭改善下切河流水生栖息地及生态的作用

本文通过野外试验研究了人工阶梯深潭对下切河流水生栖息地及生态的作用，试验河段位于西南山区的吊嘎河上150m侵蚀下切严重的河段，布置15级人工阶梯，对水流 (水深、流速、水面宽、流量)、河床底质、河床微地貌和水生底栖动物物种及数量变化进行了5个月监测。试

Effect of artificial step pools on improving aquatic habitats and stream ecological in incised river channel

Field experiment was conducted to investigate the effects of artificial step pool system on improving aquatic habitats and stream ecology of the Diaoga River, an incised stream in Southwest China. Fifteen artificial step pools were built on a 150m long experimental reach, the flow conditions(water depth, flow velocity, water surface width and discharge), substrate, stream morphologic feature and benthic invertebrates(tax richness and number density)were monitored for 5 months. Artificial step pool system effectively controls channel incision, maintains a relatively stable stream bed, and also creates spatially diversified stream habitats. The benthic macro invertebrates are used as indicator species to evaluate the ecology of the stream. After the establishment of artificial step pool system, both the number density of individual benthic invertebrate and taxa richness rise with the increase of habitat diversity, and the stream ecology is improved.