Study on Sediment Oxygen Consumption Rate in the Sanggou Bay and Jiaozhou Bay

In order to evaluate the role of shallow water bottom sediment in geobiochemical cycle of carbon,the in-situ sample culture method was used to determine the sediment oxygen consumption rate in the Sanggou Bay and Jiaozhou Bay of the Yellow Sea.The sediment oxygen consumption rates in the Sanggou Bay in May and August were 15 mmol·m~(-2)·d~(-1) and 24 mmol·m~(-2)·d~(-1),respectively,and that in the Jiaozhou Bay in Augast was 18 mmol·m~(-2)·d~(-1).It is shown from the regression analysis results that the sediment oxygen consumption rates in the two bays were positively correlated with their organic carbon and nitrogen contents in the surficial sediments.If the respiration quotient is taken as 0.8,the organic carbon mineralization rates by the sediments of the Sanggou Bay in May and August amounted to 102 % and 67 % of the primary productivity in the water column,respectively,and that by the Jiaozhou Bay ones in August amounted to 28 % of the primary productivity.If the POC biodeposition rate in the Sanggou Bay is taken as 236 mg·m~(-2)·d~(-1),the organic carbon burial efficiencies of the bottom sediments in May and August were 40 % and 3%,respectively,and the buried organic carbons in May and August amounted to 69 % and 2 % of the primary productivity in the water column,respectively.The POC natural deposition rate in the Jiaozhou Bay was determined as 250 mg·m~(-2)·d~(-1),th organic carbon burial efficiency of the bottom sediments in August was 32 %,and the buried organic carbon in August amouted to 13 % of the primary productivity in the water column of the Jiaozhou Bay.