CARBON DIOXIDE FLUXS AT WATER AND SEDIMENT IN THE URBAN COASTAL TIDAL FLAT OF OSAKABAY

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  • 大阪湾の都市沿岸部の干潟における水面・堆積物の二酸化炭素フラックス

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<p> The objective of this study was to quantify the relationships between water surface and sediment CO2 fluxes on 13 tidal flats in the coastal area of Osaka Bay. The tidal flats are generally composed of sandy sediments, and their chemical properties indicate an aerobic environment. CO2 fluxes at the water surface of the tidal flats showed a release at 8 of the 13 sites, and CO2 tended to be released at the sites with strong river influence at inner part of Osaka bay. The daily CO2 flux in the sediments was higher than that in the water surface, suggesting that CO2 is released in the sediments as decomposition of organic matter. These results suggest that CO2 tends to be released from the water surface on tidal flats, and that CO2 at sediments is released by the decomposition of organic matter accelerated in low tide.</p>

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