边境海岛生态系统服务功能时空演变及其影响因素OA

[Objective]This study aims to investigate the evolutionary trend of ecosystem service functions in Changhai County island region,and determine the influencing factors of its evolution,providing scientific references for the sustainable marine development in border regions.[Methods]This study comprehensively analyzed the spatiotemporal evolution characteristics,trade-off/synergy relationships,and the intensity of influencing factors of five ecosystem service functions,namely water yield(WY),carbon sequestration(CS),soil conservation(SC),habitat quality(HQ),and landscape aesthetics(LA),in Changhai County from 2000 to 2020 by integrating the InVEST model and the equivalent factor method.[Results](1)In the past 20 years,the total amount of water yield,carbon sequestration,soil conservation,and landscape aesthetics in Changhai County showed a decreasing trend,while the habitat quality showed a trend of first decreasing and then increasing.Among them,the variations in water yield and soil conservation were relatively large,both exceeding 50%.(2)The changes in water yield and carbon sequestration of inhabited islands showed an alternating distribution of growth and loss,while the changes in soil conservation,habitat quality,and landscape aesthetics were mainly characterized by losses.However,the water yield and carbon sequestration of uninhabited islands showed a decreasing trend,while soil conservation,habitat quality,and landscape aesthetics slightly increased.(3)HQ-CS showed a strong synergistic effect,with correlation coefficients all above 0.43.The trade-off relationship was most significant in SC-WY,and the correlation coefficients were all as high as-0.78.(4)Among the influencing factors,natural factors were dominant,followed by human factors.Moreover,the interaction among the factors was more significant than that of a single factor,indicating that the evolution of ecosystem service functions in Changhai County resulted from the combined effects of natural and human factors.[Conclusion]The ecosystem service functions of Changhai County island region generally show a declining trend,mainly due to the combined effects of natural and human factors.The Changhai County government should formulate reasonable and effective short-term and long-term governance measures.