Abstract:

Taking the 7 sampling lines of Erhai lake and the sediment of upper three primary lakes as the research object, the sediment about total phosphorus（TP）and total nitrogen（TN）has been tested, in order to analyze the TP and TN content of sediment in Erhai lake, distribution characteristics and influence factors. The result indicates that the seven sampling lines of TP average content reaches 266.80 mg / kg, maximum 818.20 mg / kg；the TN average content reaches 513.60 mg / kg, maximum 1 975.40 mg / kg. The TN and TP average content of sediment in upper three primary lake is 370.00 mg/kg；maximum content is 1 397.20 mg/kg；the TN average value is 52.43 mg/kg；the maximum is 140.20 mg/kg. TP and YN content is positive correlation with population and farmland area；TN content is also positive correlation with the annual per-capita income.

Key words: Erhai lake, sediment, total nitrogen, total phosphorus, influence factors, positive correlation