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The estuarine wetland of Luoshi River, which flowed into Lake Erhai in Yunnan Plateau, is used to be studied as a typi⁃ cal research object. Sediment samples in the estuarine wetland of Luoshi River were collected by the cylindrical sediment sampler and taken from the surface layer (0-10 cm). The spatial distributions of the total nitrogen, total phosphorus and total organic mat⁃ ter were analyzed, and did the pollution risk assessment of sediments. The results showed that: The contents of total phosphorus (TP) in the surface sediments ranged from 0.04 to 1.28 g / kg, and the TP spatial distribution characteristics were lower in areaI than areaII, but higher in channelIthan channelII. The content of total nitrogen (TN) in the surface sediments ranged from 0.33 to 2.96 g / kg, and the TN spatial distribution characteristics were higher in areaIthan areaII, and higher in channelIthan chan⁃ nelII. The content of OM in the surface sediments ranged from 32.43 to 233.03 g / kg, and the OM spatial distribution characteris⁃ tics were lower in areaIthan area II, and lower in channelIthan channelII. Combined evaluation methods with the comprehen⁃ sive pollution index and organic index to analyze the pollution of the total nitrogen and the total phosphorus in the surface sediments at the estuarine wetland of Luoshi River, results show that the pollution in areaIand channelIwas medium level, and the pollu⁃ tion in areaIIand channelIIwas mild level. The pollution of organic contaminants in channelIand channelIIwas heavy level, and the area Iand areaIIwas medium level. The spatial distribution of surface sediment at the estuarine wetland of Luoshi River was influenced by the external pollutant, the culture activity and the aquatic plant. Pollution in channel I was mainly sourced by input of nitrogen and phosphorus, and pollution in channel II was mainly dominated by organic matter.

Distribution and pollution risk assessment of nitrogen, phosphorus and organic matter in inlet rivers of Erhai Basin