Regeneration of Inorganic Nutrients from Diatom Decomposition

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  • 珪藻プランクトンからの無機栄養塩の再生

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The regeneration of the inorganic nutrients (phosphorus, nitrogen and silicon) from diatom kept in the dark place while subjected to bacterial attack was studied, using three kinds of species: S. costatum, T. decipiens and Ch. gracilis. The regeneration processes were, generally speaking, divided into four stages. The active mineralization of diatom appeared to have been restricted to the 2nd stage, which was regulated by physiological characters, species of diatom, and also the temperature condition under which the sample was kept.<BR>The resolution of silica wall and the consumption of organic carbon get earlier than the regeneration of phosphorus and nitrogen. Hence, the ratio of Si: P showed typically high value at the early time, but as the mineralization went on the ratio was gradually decreased and approached to the value which the diatom had at initial. Meanwhile, the N: P ratio maintained nearly, constant value and was close to the ratio of the starting sample. These ratios undergo a change succesively in the course of mineralization, but, seem to be regulated by the physiological characters and temperature condition. The solubility of silica frustules are finally discussed.<BR>It was inferred from the present examination that the stoichiometrical relation between oxygen consumption and regeneration of inorganic phosphorus and nitrogen, which was developed by REDFIFLD (1934) and RICHARDS (1958) for the relative distribution of nitrate, phosphate and silicate in the sea was not to be materialized at early stage of mineralization.

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