Plant Assimilation

Wetland plants absorb considerably large amounts of nitrogen, primarily as nitrates though several plants and algae do utilize NH| — N. The tissue concentrations of various plants range from 0.1% to 4.2% of the dry weight, and the total uptake of nitrogen depends upon the growth rates and maximum biomass attained by different species (Table 2) as well as the availability of nitrogen in the water (Tables 3a and 3b). The wetland plants with large proportion of structural tissues generally account for lesser amounts of nitrogen assimilation. Several studies show that whereas the nitrogen removal by plants may account for only 12-14% of the total loading in wastewater, the actual removal by the entire system through various other processes is much higher and may go up to 95% in some cases.

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