Research on Water Quality Improvement Effect by 6 Kinds of Aquatic Plants on Simulation Ecological Floating Bed

To investigate which kinds of plants could be suitable to employ on ecological floating bed in the demonstration project of ecological restoration of Maixi River and what was the effect of water quality improvement,6 kinds of common aquatic plants in Guizhou Plateau were chosen to do the tests in the laboratory.The plants included Polygonum hydropiper L.,Oenanthe javanica D.C.,Ipomoea aquatic,Sagittaria sagittifolia L.,Acorus calamus and Carna generalis Bailey.Results showed that the removal rates of total nitrogen using the above plants were ranged from 40.0% to 90.9% and those of total phosphorus were between 53.1% and 87.1%.Other indexes,such as ammonia nitrogen and chemical oxygen demand,were also varied obviously and showed well effect of removal.A.calamus and I.aquatic had larger net increase of biomass while P.hydropiper L.had the smallest.The content of nitrogen and phosphorus in overground parts of the plants were higher,thus the nutrient could be transferred from water body by reaping the overground parts.It was recognized that A.calamus and I.aquatic could be appropriate to employ on the ecological floating bed in Guizhou Plateau.