INHIBITION OF DECOMPOSITION OF EELGRASS LEAVES BY BURIAL IN THE SEDIMENT OF TIDAL FLATS

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  • アマモの流れ藻の干潟底泥内埋没による分解抑制

Abstract

<p> Measurement of the decomposition rate of dried drifted eelgrass leaves in sand, sand mud, and muddy sediments of the Yamaguchi Bay (Yamaguchi City, Yamaguchi Prefecture) tidal flat were investigated. Each dried leaves discs were buried into four kinds of the sediment environments for 6 months at maximum. Dried eelgrasses disks were processed into discs with a diameter of 6 mm and placed in mesh bags with 2 mm opening. The experiment was carried out at the beach and tidal flats of Yamaguchi Bay. As a result, we were able to measure the decomposition rate until the eelgrass became less than 2 mm in diameter. We investigated the correlation between the dry weights of eelgrasses and the bottom sediment properties at each site. The leaching amount of the dissolved component by soaking into artificial seawater was also assessed. As a result of this study, it was found that the decomposition rate was suppressed in muddy sediments. Furthermore, permeability, oxidation-reduction potential (ORP), and 10 % particle size were negatively correlated with degradation rate.</p>

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