The Potential And Actual Effect Of Megacities’ Ecological Infrastructure From The Perspective Of Service Flows

In the context of territorial space planning,the precise optimization and implementation of urban ecological infrastructure is an important approach to maintain the continuous ecosystem services for the cities and residents.At present,the traditional construction method of urban ecological infrastructure is more based on the supply side,and there exists the problem that urban ecological infrastructure cannot adapt to the social demand.The role of urban ecological infrastructure is to provide enough ecosystem services for citizens’ production and living.And ecosystem service flows reflect the spatial ralationships between supply-side and demand-side,especially the cultural service and regulating service,although their ecosystem service flows’ range is limited,but play an irreplaceable role in the city.Therefore,this study proposes to understand the service realization of urban ecological infrastructure by comparing the "potential" and "actual effect" of the urban scale-sensitive ecosystem service,so as to generate the optimization strategy of the structure and function of urban ecological infrastructure.The ecosystem service flows consist of two parts: semantic service types and spatial service ranges.The types and ranges of potential ecosystem service flows are mainly analyzed by ontology,and the types and ranges of actual ecosystem service flows can be directly characterized by big data technology.Taking the urban area within the Sixth Ring Road of Beijing as an example,this study explores the specific technical methods and implementation approaches for two important service types: recreation service and microclimate regulation service.It is found that the park-based urban ecological infrastructure in Beijing can be divided into six clusters according to the potential flows of recreation service.(1)high supply-high demand: the historic parks and comprehensive parks,represented by the temple of heaven park,lianhuanchi park and chaoyang park,have excellent performance in recreation service and microclimate regulation service,but it is necessary to coordinate the cultural service demand between tourists and locals;(2)higher supply-higher demand: community parks and ecological parks,represented by haidian park and nanhaizi park,effectively play the role of microclimate regulation,and provide recreation service for citizens at the community level preferably;(3)medium supply-low demand: the recreation service realization of the ecological parks,represented by the future science and technology city waterfront park and the new impression tai lake forest park,is affected by location,so it is necessary to coordinate the function of recreation and microclimate regulation at the city level according to location;(4)lower supply-medium demand: represented by the zhongguancun forest park and Jinxing park,the ecological parks and community parks provide important recreation service,and they also are important connection patches in the urban ecological space,but should add facilities,vegetation coverage and other approaches to further enhance the efficiency of the service flows;(5)lower supply-high demand: community parks,represented by linglong park and jinyu nanhai park,have good location and generate strong microclimate regulation service flows,but the actual recreation service flows are limited.Therefore,improving the efficiency of the recreation service flows is the focus of the following work.(6)low supply-low demand: the potential demand around community parks represented by lvfeng leisure park and jinhai park is limited,so the ecological and recreational functions can be adjusted according to their ecological benefits.