A total number of 85 taxa were collected from the four reference sites, Ephemeroptera, Trichoptera, Coleoptera and molluscs were the most abundant and widely distributed groups in these sites.

• 在清洁河段的4个对照点中，共采获大型底栖动物85种，其种类组成以蜉蝣目、毛翅目、鞘翅目和软体动物为主。