Study On Evaluation And Optimization Of Green Space Ecosystem Services In Changsha Under The Guidance Of Healthy City

In recent decades,rapid urbanization has brought high-intensity construction and development activities,and the urban ecological environment has been seriously affected.The proposal of healthy city strategy points out a new development path for cities in the new era.Urban green space is not only an important space carrier for residents’healthy life,the material basis of urban composite ecosystem,but also an indispensable space for urban healthy development.Therefore,one of the key problems faced by healthy urban construction and ecological civilization construction is to maximize the value of urban green space ecological service function.The study area of this paper is the metropolitan area of Changsha City.It quantitatively evaluates its green space ecosystem services,and puts forward the optimization strategy of green space ecosystem under the guidance of health,so as to improve the service efficiency of urban green space and promote the healthy development of the city.The research is mainly divided into three parts:(1)the construction of healthy urban green space ecosystem evaluation system.Based on the research foundation of healthy city and urban ecosystem evaluation index system,from the perspective of urban environment affecting people’s health,this paper combs and optimizes the complex ecosystem service evaluation index system.Through literature review method,questionnaire survey method and expert scoring method,a total of 9 evaluation indexes,including 15 evaluation factors,are selected from the aspects of regulation service,support service and cultural service of ecosystem service function,The weight of each index is determined by analytic hierarchy process,and a set of healthy city oriented green space ecosystem service evaluation index system is constructed.(2)Service function evaluation of green space ecosystem in the study area.Based on the recognition and translation of remote sensing satellite images,the distribution database of various types of green space in the study area is established,and a total of 68850.26hm~2of green space is extracted.It is calculated that the total value of green space service in the study area in2020 is 11441.8847 million yuan,The comprehensive evaluation score is0.788.The construction level of green space ecosystem is acceptable,but the distribution and development of green space in various types of cities are relatively inconsistent and unbalanced.The existing problems such as destruction of ecological environment,fragmentation of landscape pattern and lack of awareness of ecological services still need to be further optimized and improved.(3)Aiming at healthy urban construction,green space ecosystem optimization is carried out from three aspects:value promotion and structure optimization of green space system,planning and design strategy,overall regulation and comprehensive management.The research results can effectively guide the construction and optimization of urban green space,and explore new ways to improve the service efficiency of green space ecosystem under healthy urban construction.