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Variation in plant biomass and nitrogen removal in two wetland blocks with species composition

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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.

Keywords: constructed wetland, environmental management, ecosystem functions, nitrogen removal, plant biomass, plant diversity, wastewater

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