植物プランクトンの分解にともなう燐と珪素の再生

概要

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A study of the aerobic decomposition of two different phytoplankton assemblages from Tokyo Bay was conducted under the thermostated-dark conditin in an attempt to study the rate and extent of regeneration of phosphorus and silicon. The mechanisms for P and Si regeneration could be described by a simple first-order equation, and the process divided into two stages. In the first stage 70-80% of the biogenous-P regenerated and the remaining which was considered to be refractory and resistant, underwent slow biochemical oxidation in the second stage. The labile parts of biogenous silica differed not only from one sample to another but also from one portion to another portion on the same silica wall. Sitica dissolution rate constant at the first stage was 0.5-8×10-2 day-1, which was 10 to 30 times smaller than that for the acid-cleaned silica walls.The silica dissolution rate constant at the first stage increased about 2.3 times corresponding to a rise in temperature of 10°C and the activation energy was extimated to be about 14.1 kcalmol-1. The ratio of reactive Si to P increased exponentially as regeneration proceeded.
日本水産學會の論文