Investigation and Analysis of the Main Pollution Sources in Fuxian Lake

Abstract Fuxian Lake is a plateau-based freshwater lake. In recent ten years, with the rapid development of the economy around the lake, the water quality of Fuxian Lake has declined and the nutritional status in lake has increased obviously. To identify the main sources of pollution in Fuxian lake and provide a reference for the protection and management direction and theoretical guidance, the pollution status of Fuxian Lake basin was analyzed and evaluated from the aspects of rural domestic pollution, farmland runoff pollution, urban domestic pollution, phosphorous chemical pollution and tourism pollution, respectively, based on years of field investigation and the indexes detection and analysis such as chemical oxygen demand (COD), total nitrogen, total phosphorus. The results showed that the pollution in Fuxian Lake basin mainly came from the rural non-point source pollution, urban domestic pollution, waste phosphate rock area pollution, tourism pollution and other aspects, among which the most important source of pollution was the rural non-point source pollution, including watershed village pollution, human and animal excrement pollution, rural waste pollution, and farmland runoff pollution in the basin. The COD, total nitrogen and total phosphorus from rural non-point source pollution accounted for 94.81%, 94.85% and 87.79% of the total pollution into the lake, respectively. Among them, the farmland runoff pollution was the most important component of rural non-point source pollution