Growth Inhibition of Algae from Landscape Water by Submerged Macrophytes

Inhibitory effects of macrophytes on the growth of algal community in Landscape water of Hefei city were evaluated. In the coexistence culture system of different macrophytes species (Ceratopteris siliquosa, Echinodorus opticus, Elodea densa, Limnophila aquatica, Myriophyllum aquaticum, Najas Guadalupesis, Nesaea crassicaulis and Rotala wallichiii) and nature algal community, only the macrophytes Myriophyllum aquaticum and Rotala wallichiii inhibited the growth of algae and lead to the death of all algae. After 20 days coexistence with Najas Guadalupesis, the nature algal community is in succession to be dominated by Navicula. Chlorophyll concentration assays also provide there exist a shift in algal composition from dominated by green algae to one dominated by diatoms of Najas Guadalupesis. Combining with the NO₃^--N and Total N removal efficiency, Myriophyllum aquaticum could be candidate submerge macrophyte for further application in the landscape water maintenance.