Takahisa TOKUNAGA, Nobuhiro MATSUNAGA, Masanori ISONO and Atsushi TAKAHASHI 1 正会員 博(工) 佐賀大学 低平地研究センター講師(〒840-8502 佐賀市本庄町1) 2 正会員 工博 九州大学大学院 総合理工学研究院教授(〒816-8580 福岡県春日市春日公園6-1) 3 学生員 九州大学大学院 総合理工学府(〒816-8580 福岡県春日市春日公園6-1) On the basis of the idea that the low release of ammonium (NH 4 -N) observed in the seabed surface off Takesaki of Ariake Sea may be caused by the nutrient adsorption due to the bed materials, mud cores were sampled off Takesaki and the quantities of pore water were

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... d through laboratory experiments. The oxygen consumption and the concentrations of NH 4 -N and phosphate (PO 4 -P) were also measured through the experiments of mud resuspension. Though the concentrations of NH 4 -N and PO 4 -P increased with the depth from the surface of the mud core, they began to decrease after taking maximum values at some depths. The vertical profiles were very different from those seen in ordinary mud. The experiments of mud resuspension showed that the concentrations of NH 4 -N and PO 4 -P were kept constant though DO was consumed. These experimental results support the possibility that the high nutrient adsorption by the bottom mud occurs off Takesaki of Ariake Sea.