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Sancha lake is the second largest lake in Sichuan Province, the factors of affecting eutrophication are not only point pollution source, but also non-point pollution source. The results of the investigation show: drawing water is 50% of total phosphorus contribution, cage culture is 10.44%, 39.21% of precipitation and surface runoff, sewage is 0.35%, although the drawing water is 50% of the total...