Abstract
In order to elucidate a link between SOC and the benthic environment, field observations of water quality and sediment environment were carried out from summer to autumn at 5 sites in the head of Tokyo Bay in 2009 and 2010. SOC was relatively large in off-Makuhari dredged pit and peaked at Ebigawa river mouth. Temporal variation and dominant patterns of quinone were different across stations. The experiment result of long-term oxygen consumption and changing content of quinone before and after analysis speculated that SOC tended to strengthen because increase of microorganism number by decomposable matters, promotion of microorganism activation and strengthening of oxidation of reduced substances in the sediment when bottom water is provided oxygen from upper layer. SOC afterward reduces due to decrease of microorganism number and elution suppression of reduced substances.
