Abstract
The variation in plant biomass and nitrogen (N) removal capacity with species composition was studied in two constructed wetlands. Findings indicated that increased species compositions had a positive influence on plant biomass and a negative effect on the inorganic N concentrations in substrate and substrate solution (effluent). Elevated N concentrations enhanced the effects of species compositions on plant biomass. The Cyperus alternifolius+ Arundo donax mixture produced the largest plant biomass and the smallest inorganic N concentrations in substrate. The Cyperus alternifolius+ Coix lacryma-jobi +Arundo donax and the Cyperus alternifolius+ Coix lacryma-jobi + Lythrum salicaria +Arundo donax mixtures produced the largest plant biomass under high N condition (146 g N m–2 yr–1). In general, the three- and four-species compositions produced the largest plant biomass and the smallest inorganic N concentrations in substrate and effluent. It suggests that plant mixtures are useful in increasing plant biomass and the wastewater N removal capacity.
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