Analysis of Phytoplankton and Eutrophication in Xinlicheng Reservoir

According to the analysis results of phytoplankton collected after July 2007, the dominant population is chlorella or cyclotella, and cell density of phytoplankton and content of chlorophyll-a are different as seasonal change. In 2007, reservoir water is classified as light eutrophic. Later degree of eutrophication declines and water quality become better. The occurence of eutrophication is promoted by something including much of nitrogen and phosphorus from upstream water, suitable temperature and illumination. Controlling nitrogen and phosphorus sources and strengthening artificially biologic chain are adopted to prevent eutrophication. Obvious effect has being achieved in recent years.