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Emissions of CO2 from tidal-flat sediments were measured using the chamber method to investigate the characteristic of organic matter degradation at the north pond of Osaka Nanko Bird sanctuary. Indoor experiments were also conducted to clarify the effect of changes of the groundwater level on the CO2 emission by manipulating the water table level of the sediment. The amount of organic matter degradation varied seasonally and increased with increase of temperature and biomass of benthic organisms in summer. Emissions of CO2 from the bottom sediment were highest when the water table level was lowest at low tide in a day. These results demonstrate that the amount of organic matter degradation varies daily or seasonally depending on temperature, groundwater level and biomass of organisms of the bottom sediment.

doboku gakkai rombunshuu. b2, kaigan kougaku

Characteristics of Organic Matter Degradation at an Artificial Tidal Flat in the Vicinity of Urban Area - Measurement of CO2 Flux Using the Chamber Method -