Abstract
A recent development to control of eutrophication is the ecological engineering, which involves using plants for water purification. Specifically, aquatic plant, Zizania latifolia, is profitable for nutrient absorption and nutrient elimination from an enclosed system, serving as food for migrating swans. In this study, an experiment in a water culture inhibiting the nitrification and denitrification was conducted to evaluate the ability of nitrogen and phosphorus absorption by Zizania latifolia from May to December in 2001 (32 weeks) . The results were as follows: The wet weight, the amount of water absorption, the amounts of Total Inorganic Nitrogen (TIN) and phosphorus (PO4-P) absorption by Zizania latifolia increased along with growth of Zizania latifolia. The maximum wet weight was taken in October (636g) and the amount of the whole experimental period of water absorption was 74.5kg. The maximum amount of TIN and PO4-P absorption of Zizania latifolia were taken in September, which values were 629mg⋅4weeks-1 and 133mg⋅4weeks-1, respectively. The amounts of the whole experimental period of TIN and PO4-P absorption were 3, 150mg and 631mg, respectively. Finally, the results showed that 5.4mg of TIN and 1.1mg of PO4-P were required for Zizania latifolia to grow 1g of wet weight.
