Ceratophyllum demersum has a strong water purification capacity,can reduce water nutrients and adsorb heavy metals.As a widely distributed submerged plant in the Yangzonghai watershed,it is expected to play a sig-nificant role in purifying the major pollutants in Yangzonghai Lake.Based on the primary pollutants in Yangzong-hai Lake,this study designed a series of graded purification effect experiments and orthogonal tests to analyze the purification efficiency of Ceratophyllum demersum against characteristic pollutants in the lake(total nitrogen,to-tal phosphorus,and arsenic).The research indicates that the average water purification efficiency of Ceratophyl-lum demersum is optimal when nitrogen presents at high concentrations.Arsenic and phosphorus are at low con-centrations.Based on the water quality conditions of Yangzonghai Lake,it is inferred that the water purification efficiency of Ceratophyllum demersum itself can exceed 85％.The findings provide a scientific basis for the ra-tional utilization of Ceratophyllum demersum in improving the water quality of Yangzonghai Lake.
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