Carbon Sink’s Spatial-temporal Evolution And Study Of Influencing Factors Of China’s Marine Fishery

The scientific community generally agrees that global warming is a result of climate change caused by human activities.Limiting carbon emissions and developing a green,low-carbon economy are key solutions to climate change and important measures to implement the scientific concept of development.In recent years,China has actively implemented the "carbon neutral" development strategy to address global climate change,demonstrating its role as a great nation and fulfilling the inherent requirements of a beautiful China.The implementation of the "double carbon target" is not only a structural transformation of carbon emission reduction,but also a consideration of the ability to increase carbon sinks.The oceans are the largest carbon reservoir on earth and have a huge potential to increase sinks,especially the "removable carbon" capacity of marine fisheries,which is one of the win-win ways to alleviate the current difficulties.Based on the existing researches on Marine fishing and mariculture,and on the basis of the theories of average nutrient level of catch,ecosystem and sustainable development,this thesis calculates the total carbon sink of Marine fishery in China and analyzes its spatio-temporal evolution characteristics according to the average nutrient level of fishery production and catch in China from 2001 to 2020.Then,The forest carbon sink and carbon storage were taken as reference to show its development trend.Finally,grey relational analysis was used to explore the influencing factors of China’s Marine fishery carbon sink.The conclusions of the analysis are as follows:Firstly,during the study period,China’s Marine fishery carbon sink showed an overall upward trend,but the differentiation was obvious.The deep-sea fishery carbon sink developed as the main source,while the offshore fishery carbon sink continued to shrink.Secondly,there are significant spatial differences in the carbon sinks of China’s marine fisheries,with the polarization of pelagic fisheries being serious,with the Pacific Ocean having the highest number of carbon sinks and the Atlantic and Indian Oceans having the lowest number;the offshore fisheries are relatively balanced,with the East China Sea having the highest number of carbon sinks,the Bohai Sea having the lowest number,and the South China Sea and Yellow Sea having similar patterns.Then,China’s marine fishery carbon sinks contribute a great deal compared to forest carbon sinks,but the gap between the two is narrowing year by year,and their contribution capacity is becoming weaker.Finally,the correlation between the factors influencing the carbon sink of China’s marine fisheries varies,with the average trophic level of fish catch being the higher correlation among the four stages according to the grey correlation ranking results,while the correlation between total household income,fishery technology promotion expenses and fishermen’s net income per capita is extremely low.At present,China is in a "new normal" of economic development,and expanding investment in carbon sinks in marine fisheries will help achieve the goal of "carbon neutrality".This thesis studies the carbon sink of China’s marine fishery,on the one hand,to promote the development of marine fishery in the direction of protective development,on the other hand,to improve the carbon sequestration system of marine fishery,and to provide a practical basis and theoretical basis for promoting the application value of carbon credit.