沿岸域の底泥における有機物の無機化について〔英文〕

概要

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The mineralization rate in the marine sediments was estimated in the coastal areas of Beppu Bay, Osaka Bay and Hiuchi Nada in the Seto Inland Sea by the kinetic approach method described by M. J. HARRISON et al. The highest mineralization rate of sediments was measured on the surface in Hiuchi Nada, the second in Osaka Bay and the lowest in Beppu Bay. Vilable counts of heterotrophic bacteria on the surface of sediments of Osaka Bay and Hiuchi Nada were larger than those of Beppu Bay. Since the C/N ratio in Beppu Bay was larger than those in Hiuchi Nada and Osaka Bay, the activity of microorganisms was lower in Beppu Bay than that in the other two areas. As the mineralization rate and the number of heterotrophs decrease significantly with the column depth of sediments, the surface of the sediments is important for mineralization of organic materials. Comparing the mineralization rate on the surface of the sediments with that in the overlaying water, the percentage of the mineralization in the shallow waters like Osaka Bay was larger than that at the relatively deep waters of Beppu Bay.
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