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Variation in plant biomass and nitrogen removal in two wetland blocks with species composition
Courtesy of Inderscience Publishers
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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