Research On The Decoupling Relationship Between Urbanization And Ecosystem Service Value Based On The Tapio Model

Since the implementation of reform and opening up in 1978,China has experienced a rapid process of socialist urbanization and industrialization.In the context of such rapid urbanization,the conflicts and contradictions between economic development and the natural ecological environment are also intensifying.As the core area of China’s economic and social development and economic and social progress,the Yangtze River Delta urban agglomeration is facing a series of increasingly severe natural and ecological environment problems in the process of urban construction and urbanization.Researching the coupling,coordination and decoupling relationship between urbanization level and ecosystem service value of urban agglomerations is conducive to providing theoretical support for safeguarding and maintaining ecosystem health,realizing sustainable development of this region,and providing reference basis for other urban agglomerations with similar problems.Therefore,by using the land use and socio-economic data of the Yangtze River Delta urban agglomeration from 2005 to 2018,based on the value coefficient method,entropy method and linear weighted sum method,this paper measures,calculates and analyzes the urbanization level and the service value provided by the ecosystem,and explores the spatio-temporal differentiation characteristics of the two.Starting with four major categories of ecosystem services,including regulatory services,support services,supply services,and cultural services,the spatial and temporal changes of these services were analyzed.From the perspective of four urbanization subsystems,including population urbanization,spatial urbanization,economic urbanization and social urbanization,the evolution process and change rules of each subsystem are explored.Build suitable for the coupling coordination degree model of this study,elastic decoupling model,in the urbanization system and the ecosystem services value system,subsystem of urbanization and ecological system service subsystem,respectively for the calculation of coupling coordination degree and decoupling relationship,to reveal the characteristics and development laws of spatial interaction between them,and provide theoretical and practical basis for the development of green economy and the sustainable development of urban agglomerations.The results are as follows:(1)The overall urbanization process of the Yangtze River Delta urban agglomeration is relatively fast.Except for a slight decline from 2010 to 2015,the overall urbanization level still shows an upward trend during the study period,and the urbanization level presents a "U" shaped curve during the study period.The development of urbanization in population,space,economy and society is not uniform,and there are great differences in the urbanization process of cities within the urban agglomeration.(2)During 2005-2018,the overall value of ecosystem services in the Yangtze River Delta urban agglomeration showed a gradual increasing trend,and the increasing speed of each service function was different.During the study period,there were periods of decreasing of food production function.Ecosystem service value is affected by land use/land cover change to a certain extent.(3)during the period of 2005-2018,Yangtze river delta urban agglomeration in the urbanization level and the ecosystem services value between the coupling coordination degree in 2005,and 2015 for moderate dysfunctional relationship,and in 2010 for moderate harmonious relations in 2018,is a highly coordinated relations,presents the "N" type curve,and the decoupling relationship for strong decoupling,in 2005-2010 in2010-2015 as the strong negative decoupling,in 2015-2018,returned to the strong decoupling relationship,presents "U" type curve.The results of coupling coordination model and decoupling model are similar,which confirm and support each other.In the representative study period,from 2010 to 2015,the coordination between urbanization level and ecosystem service value was the worst,and the development of both of them was going backwards,which was not an ideal development state.(4)Different subsystems of urbanization have different impacts on the ecosystem service value.In general,the process of population and spatial urbanization has the greatest impact on the supply and regulation of services,and population flow and urban spatial expansion bring the greatest pressure to the ecosystem.