In order to elucidate a link between the sediment oxygen consumption (SOC) and the benthic environment, field observations of water quality and sediment environment were carried out during summer to autumn at 4 sites in the head of Tokyo Bay in 2009. SOC was observed by chamber methods after sampling by using fluorescent DO meter at a laboratory. The benthic environment was observed by a CN ratio and the quinine profile methods. Water quality on the seabed was also measured including DO,

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... and nutrients at the same time. SOC was positively correlated with quinine concentrations. This correlation was the same level as water temperature, salinity and sulfide. From the long-term oxygen consumption experiments, influence of sediment microbial community was also confirmed.