A new method of evaluating the mineralization of particulate and dissolved photoassimilated organic matter |
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Authors: | Masanobu Ishikawa Hajime Nishimura |
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Affiliation: | (1) Department of Chemical Engineering, Faculty of Engineering, University of Tokyo, Hongô 7-3-1, Bunkyô-ku, 113 Tokyo, Japan |
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Abstract: | A new method of evaluating the rate of mineralization of photoassimilated organic matter is described. This method enables us to compare the rate of direct mineralization of particulate organic carbon (POC) to CO2 with the rate of solubilization of photoassimilated organic carbon followed by the mineralization of the resultant dissolved organic carbon (DOC) under the same conditions. The direct mineralization of photoassimilated carbon from POC to CO2 is a more significant process compared with the mineralization of extracellular released organic carbon. The first-order rate coefficients range from 0.132 to 0.434 day–1 for direct mineralization and 0.034 to 0.189 day–1 for solubilization. |
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