Research on the Removal Effect of Nitrogen and Phosphorus in Eutrophic Water by Four Submerged Plants

[Objective] To study the removal effect of nitrogen and phosphorus in eutrophic water by four submerged plants.[Method] The outdoor pot experiments were conducted to study the removal effects of four submerged plants,including Elodea canadensis,Ceratophyllum demersum,Vallasneria asiatica and Myriophyllum spicatum,on nitrogen and phosphorus in eutrophic water.[Result] ①All of the four submerged plants grew well in eutrophic water and had excellent ability to remove nitrogen and phosphorus.② Comparing with the control,the average removal rate of four submerged plants on phosphorus was 7.65%,8.85%,6.97% and 1.86% higher,among them,Ceratophyllum demersum showed the best removal capacities on phosphorus.③ Comparing with the control,the average removal rate of four submerged plants on nitrogen was 7.93%,19.38%,16.13% and 16.19% higher and Ceratophyllum demersum showed the best removal capacities on nitrogen.[Conclusion] Ceratophyllum demersum could be planted as pioneer species to treat the eutrophic waters in Northeast China.