Research On The Supply And Demand Of Green Infrastructure Ecosystem Services And Optimization Of Landscape Pattern

With the advancement of urbanization and the deterioration of urban ecological environment,urban heat island effect,haze,water resources and other issues have become important issues affecting people’s production and life.Human normal production activities benefit from a good ecosystem.Research on ecosystem services has reached a climax with the advancement of the global Millennium Ecosystem Assessment in 2000.People have explored ecosystem services from different scales and fields.As an important part of urban construction,green infrastructure is an important builder of ecological environment in urbanized areas.Its ecosystem services play an important role in maintaining ecological security in urbanized areas and ensuring sustainable economic and social development.However,the current comprehensive research on landscape pattern of green infrastructure,ecosystem services and regional ecological security is still not deep enough.The specific manifestation is that the comprehensive research on supply and demand of ecosystem services is still relatively few,especially the measurement indicators and assessment methods of demand.In addition,the research on ecological security pattern based on supply and demand assessment of ecosystem services is relatively lacking.。Therefore,in-depth study of green infrastructure and its spatial pattern in urbanized areas has important scientific value for understanding the relationship between supply and demand of ecosystem services in urbanized areas,and has important practical significance for guiding the planning and construction of urban green infrastructure and building regional ecological security.Taking Great Xi’an area for an example,supported by landscape ecology,geography and economic theory,and supported by remote sensing data,statistical data and field data,this paper intends to construct a comprehensive estimation model of supply and demand of ecosystem services to measure and analyze the value of supply and demand of ecosystem services in the study area.On this basis,the landscape security pattern of the green infrastructure in the study area is analyzed,and then the ecological network system of the green infrastructure in the study area is constructed and optimized.This has a certain reference for the urban construction of Great Xi’ an region,can better guide the implementation of urban planning,and promote the improvement of regional ecological environment has a certain positive significance.Through the analysis of this study,the following conclusions are drawn:(1)The supply of ecosystem services in the study area is generally insufficient,Carbon sequestration and oxygen release services play the most important role in the supply and demand,and its supply can not meet the demand.Carbon sequestration and oxygen release become the most prominent problem in the contradiction between supply and demand of regional ecosystem services.(2)There are great differences in supply and demand of different ecosystem services between different Township and sub-district offices.Generally speaking,the demand of sub-district offices in Xi’an and Xianyang are high,while that of surrounding towns with low urbanization degree is low.This shows that the rapidly urbanized areas are prone to lead to the contradiction between supply and demand of ecosystem services.。(3)The correlation between supply and demand of ecosystem services is relatively small,and there are many factors affecting supply and demand of ecosystem services.Population density,people’s economic income and living expenditure are the most important factors.This shows that the development of economy and society has increased people’s demand for ecosystem services.In order to ensure ecological security,it is necessary to further strengthen the green of urbanized areas.Infrastructure construction and protection,improve the supply of ecosystem services.(4)Through the analysis of landscape scale effect,the scale of ecological source optimization in Great Xi’an area is 1600 meters.Under this scale,the study considers that there are some problems in the green infrastructure in Great Xi’an area,such as unbalanced spatial distribution of ecological sources,insufficient density and integrity of ecological corridors,insufficient optimization of ecological nodes and inadequate network system.To solve these problems,this paper puts forward an optimization scheme for the construction of ecological security pattern of the green infrastructure in Great Xi’an,including increasing the local area of ecological sources.Improve its integrity,local adjustment and increase of the number of ecological corridors to improve its integrity and connectivity,increase of ecological nodes and node optimization,and build a complete optimization network.