駿河湾における溶存態有機物のサイズ特性

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Size distribution of dissolved organic matter (DOM) was studied in the Suruga Bay by using a tansential-flow ultrafiltration system. In this study, DOM was fractionated into three fractions, HMW (10 kDa to 0.1um), MMW (1 kDa to 10 kDa), and LMW (smaller than 1 kDa). Concentration of dissolved organic carbon (DOC) was highest in LMW (52.5-57.3 μM and 38.2-58.7 μM at 20 m and 800 m, respectively), followed by MMW (15.0-15.9 μM and 5.9-11.4 μM) and HMW DOM (2.1-2.7 μM and 0.5-0.7 μM). As for the samples taken at 20 m, C : N ratio of HMW DOM was lowest (9-11) among the three fractions, whereas tha of LMW DOM marked the highest values (16-18). This result indicates that HMW DOM contains more amount of nitrogen enriched organic compounds compared to LMW DOM. 0n the other hand, C : N ratio of MMW DOM at 800 m was highest (19.3-22.5) among the three fractions as for the samples taken in September and November, suggesting an intensive remineralization of nitrogen enriched organic compounds contained in MMW DOM via its export from the surface to the mesopelagic zone. Concentration of dissolved organic phosphorous (DOP) at 20 m was 0.01 μM as for HMW DOM and the corresponding value was 0.10-0.11 μM as for the fraction of smaller than 10 kDa (MMW+LMW DOM). C : N : P ratio of HMW DOM was 183 : 17 : 1 and 192 : 18 : 1 in September and November, respectively, whereas that of MMW+LMW DOM was 610 : 41 : 1 (September) and 528 : 33 : 1 (November), indicating the relative enrichment of organic phosphorous in high molecular weight DOM.

駿河湾における溶存態有機物のサイズ特性

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