Study on Carbon Sink Price Accounting of Farmed Shellfish

Farming shellfish is one of the most effective ways of biological carbon sequestration, whose carbon-sink function was one part of marine ecological system function, with both ecological and economic properties. Carbon price accounting can provide reference data for seawater shellfish aquaculture industry subsidies, increase carbon sink aquaculture industry production enthusiasm, and provide certain reference to marine GEP accounting. However, there is a lack of research on carbon sink prices at present, and carbon sink prices of cultured shellfish are limited by imperfect carbon sink measurement methods. Therefore, based on the principle of carbon storage changes, this paper improved the basic formula for carbon sequestration in farming shellfish aquaculture environment, and two calculation parameters of attached shellfish carbon sequestration and biological deposits were added as a starting point to select and improve the pricing method of carbon sequestration in marine ranch, the selection of the Dongfang Yunxi sea ranch was calculated as a case study, the result was: The carbon sink prices of bay scallop, Chlamys farreri and wrinkled oyster were 165 yuan/t, 185 yuan/t and 272 yuan/t, respectively. The carbon sequestration per unit of cultured shellfish obtained by the improved carbon sink measurement method was relatively high. Among them, the effect of bio-sediment carbon sequestration on increasing the carbon sequestration per unit was the most prominent, accounting for about 91% of the shellfish′s own carbon sequestration. It was related to the hydrological conditions of aquaculture sea areas; higher carbon sequestration results in lower carbon sequestration prices, and carbon sequestration and cost-benefit factors together affected the carbon sequestration price of cultured shellfish. In the long run, carbon sequestration prices will decrease as carbon sequestration metering becomes more perfect.