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Today, the global economy presents a leaping economic network centered on coastal areas. Relying on the ocean has become a very important economic development path for many countries and regions. To coordinate and solve the contradiction between the economic development of Hainan Island and the protection of marine ecological environment, this study, based on the matter-element extension evaluation model, examines the marine ecology of Hainan Island considering the construction of a free trade port. This study uses the extension set theory to describe the advantages of the intermediate state and dynamic trend of the transformation of the assessment object to a certain level, to improve the assessment accuracy of marine ecological carrying capacity. The results show that the marine ecological carrying capacity of Hainan Island in 2016 to 2018 is relatively stable, at the transformation grade of N 3 , indicating that the marine ecology of Hainan Island is in a medium bearing, sub health state. Focusing on protecting marine ecology, developing a modern service industry, and developing high-tech industry can be effective in improving the ecological carrying capacity of Hainan Island.

tropical conservation science

Extension Evaluation of Marine Ecological Carrying Capacity: An Empirical Study Based on the Development of Tropical Marine Island Free Trade Ports in Developing Countries