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Chaohu Lake and its surroundings constitute a complicated system where many ecological problems have accumulated for years．In addition to physical，geological and biological factors，chemical factors are also important for the dominance of Microcystis and its bloom．Nutrient elements are abundant in the lake water with total phosphorus concentration of 0．142 mg/L and the total nitrogen of 1．68 mg/L．Evidence suggest that it is light which limits the algal development in the growing seasons．To reduce allochthonous phosphorus load，first from the point sources，and to change the aquatic conditions back to P．．1imiting state by various means is the prior approach while an integrated treatment of the whole environment is needed to stabilize the system．
