水生植物 (マコモ) の無機態窒素吸収特性に対する無機態窒素濃度及びNH_4-NとNO_3-Nの濃度比率の影響

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Zizania latifolia is profitable for nutrients uptake and nutrient elimination from enclosed system, serving as food for migrating swans. Experiments in the laboratory scale were conducted to evaluate the inorganic nitrogen uptake by Zizania latifolia with the changing inorganic nitrogen concentration and its ratio. In order to eliminate the effects of soil adsorption, experiments were carried out on water culture. The highest rate of inorganic nitrogen (ITN) uptake was obtained when the NH4-N and NO3-N concentrations were the same in November. The uptake rate of NH4-N by Zizania latifolia was higher than that of NO3-N. It was also known that the uptake rate of ITN during April and July was higher than that of ITN during August and November. The highest rate of NH4-N uptake was acquired when initial NH4-N concentration was 21mg·l-1. But, when the initial NH4-N concentration was 28mg·l-1, the rate of NH4-N uptake was declined. The relationship between ITN concentrations and the rate of ITN uptake was obtained as the following: Y=1.03X⁄(6.8+X)
社団法人　日本水環境学会の論文
2001-01-10