In order to investigate the influence of various aquaculture mode on the carbonate system in Sanggou bay,a field survey,including seaweed,shellfish-seaweed,shellfish-fish and shellfish culture,was conducted in the open sea area in Sanggou bay in April,July,October and December,2019.Temperature,salinity,pH,dissolved oxygen,total alkalinity(TA),dissolved inorganic carbon(DIC)and partial pressure of carbon diox-ide(pCO2)were analyzed.In addition,the air-sea carbon dioxide flux(FCO2)was calculated.The results showed that the main influencing factors of carbonate system in Sanggou bay algae culture area were algae growth and offshore seawater exchange.The carbonate system in the shellfish culture area was affected by both shellfish respiration and calcification.Because of the FCO2 in Sanggou bay shellfish culture area was negative and was a CO2 sink area,the calcification of shellfish in this area could be stronger than respiration.The FCO2 of Sanggou bay aquaculture area in spring,summer,autumn and winter were-66.60±16.82,-52.44±21.66,-74.00±11.45 and-92.65±34.13 mmol·m-2·d-1 respectively,indicating that they were the sink of CO2.The carbonate system in Sanggou bay was affected by aquaculture action,and there were significant differences among different aquaculture modes.
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