Purification Efficiencies of Two Kinds of Aquatic Plants and Their Combination on Eutrophication of Urban River in Low Temperature Season

[Objective] The aim was to understand purification efficiencies of aquatic plants on urban river eutrophication in low temperature season.[Method] By the method of static water culture,purifying effects of two kinds of aquatic plants(Myriophyllum spicatum,Hydrocotyle verticillata) and their combination on urban river eutrophication were studied.[Result] The results showed that two kinds of aquatic plants can survive and grow in the water from urban river in low temperature season.But in the different plant processing systems,their cumulated biomass were different,which was in the descending order of Myriophyllum spicatum,Hydrocotyle verticillata and their combination.Compared with control group,it was obvious for three plant processing systems on the removal of total nitrogen,total phosphorus and ammonia nitrogen,but it was not obvious on the removal of chemical oxygen demand.The order of the removal effect of three different plant systems to total nitrogen,total phosphorus and ammonia nitrogen were same,which was,Myriophyllum spicatumHydrocotyle verticillata combination.[Conclusion] The results of this study would provide the basis data or foundation for aquatic plants restoration and utilization in low temperature season and purification effectiveness evaluation on urban river.