Abstract: This paper deals with the ecological characters and biological effects of aquatic plants in the 3 River Systems at the upper streams of Dahuofang Reservoir. Among 60 aquatic plant species, hygrophyte and emerging plant are dominant and submerged plant is not developed. The influences of water pollution on the community structure of aquatic plants, the distribution of pollutants within plant bodies and their absorption and accumulation of heavy metal pollutants are discussed. The Cu and Zn contents in dry matter of aquatic plants are topped to 71.83mg/kg and 115.63mg/kg respectively, and those in the river sediment are far higher than in the plant body.

Key words: Aquariculture water, Flocculant, Superior complex strain, Comprehensive treatment, Ecological equilibrium aquariculture