Evaluation of an organic matter decomposing function from hydrolytic enzyme activities of tidal flat sediments in Japan

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Thirteen study site of tidal flats were selected from 5 areas in Japan (east Hokkaido, Tokyo Bay, Ise Bay, Ariakekai and Yaeyama Islands) to evaluate an organic matter-decomposing function from the hydrolytic enzyme activities of sediments. At each study site, sediment samples were collected from layers 0 - 10 cm in depth, and cellulase (CEL) and β-acetylglucosaminidase (AGA) activities were measured using CMCNa and PNAG, respectively, as substrates. The enzymic activities were different among the study sites; CEL ranged 2 - 30 nmol g-1 h-1 and AGA ranged 10 - 140 nmol g-1 h-1. There were positive correlationships between the two enzymic activities, with both activities also showing positive correlations with organic matter contents and silt-clay contents. AGA activity was relatively higher at sites where the biomass of crustaceans was higher. These results show that enzymic activities seem to change quantitatively and qualitatively with the organisms supply detritus and with silt-clay content that affects the stability of the enzymes. Due to enzymic activity, the decomposing function was higher in tidal flats where organic-matter and silt-clay content were high.
日本陸水学会の論文