Impacts Of Chlamys Farreri Physiological Activities On Coastal Sea Carbon Cyle

Ocean is the biggest active carbon sink on the earth, which adjust the global climate change effectively. Marine carbon cycle therefore is the most important link in the global carbon cycle. Marine carbon cycle is constituted by"Dissolve pump","Biology pump"and"Carbonate pump", which are drived by mairne organisms life activities directly or indirectly. In coastal area, where have more rich primary production and more atctive organsims than off shore marine, so the biological impacts on carbon cycle more intensively in that area, especially in the shellfish and alga culture zones. Though we have known much on global marine carbon cycle now, there are many problems on the offshore carbon cycle. Studies of culture organisms'impacts on offshore carbon cycle can help us solving the problems above. So the impacts of salinity, temperature and marine acidification on calcification and respiration of Chlamys farreri, which is an important economic specie in northern of China are studied; and impacts of shellfish aqaculture, algea aquaculture and integrated multi-trophic aqaculture (shellfish-algea) on seawater's system and"Dissolve pump"are simulated; Combining these research results and historical data evaluating ZhiKong scallops aqaculture's role in jiaozhou bay carbon cycle. The main results as below:1. The calcification rate and respiratory rate of C. farreri are impacted by the salinity evidently. The calcification rate rises with salinity in the range of 15-25, then fails as salinity down. The respiratory rate increases with salinity in the range of 15-25, and decreases with salinity in the range of 25-35. And calcification rate, respiratory rate of CO2 and O2 all reach maximum in salinity 25, which are 0.33±0.02μmol.FWg^-1.h^-1, 2.32±0.10μmol.FWg^-1.h^-1 and 2.87±0.14μmol.FWg^-1.h^-1 respectively. CO2 relaxed by C. farreri also get max in that condition. 2. The calcification rate and respiratory rate of C. farreri are impacted by the temperature evidently, which are raise with temperature in the range of 5-25℃. Calcification rate, CO₂ respiratory rate and O2 respiratory rate raise from 0.19±0.01μmol.FWg^-1.h^-1,1.38±0.06μmol.FWg^-1.h^-1,1.64±0.11μmol.FWg^-1.h^-1 to 0.39±0.02μmol.FWg^-1.h^-1,5.44±0.29μmol.FWg^-1.h^-1,6.34±0.33μmol.FWg^-1.h^-1 respectively.3. Calcification and respiration of C. farreri decreased as pH declined significantly. Calcification rate decreased by 33% when the pH of water was 7.9. And at pH 7.3, calcification rate would be close to 0. CO₂ and O2 respiratory rates were reduced by 14% and 11% respectively at pH 7.3. 4. Seawater CO₂ system can be changed by the shellfish, algea aqaculture significantly. DIC can be absorbed by algea aqaculture, which result in the decreasing of P_CO2.DIC and P_CO2raising for the calcification and respiration of shellfish which can disturb the"dissolve pump". Suitable proportion of shellifsh aqaculture and algea aqaculture may eliminate the negative effcets of releasing CO₂ from the respiration and calcification of shellfish. 5. Impacts on carbon cycle of C. farreri by respiration, calcification and biodeposition in Sanggou Bay was researched by the method of laboratory experiment and mathematical stimulating. These were 1.22×10⁴t and 7.57×10²t carbon releasing each year by respiration and calcification of C. farreri respectively; and these was 8.71×10⁴t carbon sinking to the bottom of sea by biodepositon, most of which would been buried and leaving geochemical circulation. Though carbon was releasing by respiration and calcification, more carbon was buried by biodepositon. So C. farreri should be considerd as carbon sink as a whole.