鳥取県湖山池における池水と底質間のN, Pの source-sink 関係

概要

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A model experiment was conducted in order to clarify the source-sink relationship of N and P between the sediments and overlying water in eutrophic lake Koyama in Tottori. Two and 10 mg·l-1 NO3-N and 0.2 and 1 mg·l-1 PO4-P were added to the 900 ml water on 150 g sediments. The water temperature was kept at 15, 20 and 25 C, respectively.The sediments functioned as sink in both concentrations of N and P. It was likely that the NO3-N was changed to different forms by bacteria and the PO4-P was fixed by physico-chemical processes in the sediment.The sediments functioned as source when distilled water was used as the overlying water. Ammonium N and organic N, PO4-P and organic P were supplied by sediments to the overlying water.It seemed that the sediments contributed to maintain the concentration of N and P in the overlying water as that in the lake water.
社団法人　日本水環境学会の論文
1997-12-10