We studied the nutrition removal, taxa and density
of phytoplankton, concentration of chlorophyll-a (chl-a) of the monoculture
constructed wetlands (CWs) planted with submerged macrophytes Hydrilla
verticillata, Elodea nuttallii, Myriophyllum spicatum and Vallisneria
natans to probe the nutrient and alga removal effects of the CWs. The CWs
had significant differences (P < 0.01) in removing
different nutrients, with E. nuttallii wetland having the highest
removal rate of total phosphorus (TP), H. verticillata wetland having
the highest removal rate of ammonia nitrogen (NH4-N) and M. spicatum wetland having the highest
removal rate of chemical oxygen demand (CODCr). Removal rates
of all the nutrients except CODCr changed obviously with seasons.
The concentrations of chl-a and the density of phytoplankton in the CWs also
varied with seasons, with the values being significantly lower in winter than
in summer (P < 0.01). E. nuttallii wetland had a significantly lower chl-a concentration than the other wetlands (P < 0.01). Macrophyte biomass
was significantly different among these wetlands (P < 0.01). E.
nuttallii wetland had higher inhibition ability on algae than the other
three wetlands in summer (P < 0.05), and E. nuttallii and M. spicatum wetlands than H. verticillata and V. natans wetlands in winter (P < 0.05).
Cite this paper
Yan, Z. , Song, B. , Zhang, L. , Liu, M. , Liu, Y. , Wu, X. , Tian, Y. , Chen, Z. and Zhao, J. (2016). Effects of Submerged Plants on the Growth of Eutrophic Algae and Nutrient Removal in Constructed Wetlands. Open Access Library Journal, 3, e3056. doi: http://dx.doi.org/10.4236/oalib.1103056.
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