城市边缘区绿色基础设施网络规划研究--公益性产出保障导向

GREEN INFRASTRUCTURE NETWORK PLANNING IN URBAN FRINGE:FROM THE PERSPECTIVE OF ENSURING PUBLIC GOODS OUTPUT

由穿插于农田、荒地、村镇聚落之间的片林、湿地、河道和小规模分散农林空间等构成的城市边缘区绿色基础设施网络兼具自然生态维育与城乡服务两大公益性基础服务功能,而源自近郊规模农业生产、旅游业不当建设与城区污染转嫁的生态胁迫危及其公共产品输出总量与品质。文章从保障公益性产出视角,探讨根植于地域景观格局的边缘区多功能绿色基础设施规划框架与重点环节:(1)评价现状绿色基础设施网络并鉴定其公益性产出功能,制订复合规划目标;(2)识别具有公共产品输出潜能的用地斑块并甄别关联生态过程空间模式,分析响应自然生态系统与城区功能诉求的规划保障路径;(3)构筑三网叠合的蓝-绿空间布局框架,并进行保障公益性产出的规划绩效评估。

The tree belt,wetland,river,and small-scale fragmented forested and agricultural space in farmland,wasteland,and village settlements constitute a green infrastructure network in urban fringe,which has two basic service functions:natural ecological conservation and public service provision in both urban and rural areas.However,the ecological stress from the large-scale agricultural production in suburban areas,improper tourism development,and urban pollution transfer endangers the total output and quality of public goods of the green infrastructure network.From the perspective of ensuring public goods output,the article discusses multi-functional green infrastructure planning strategies and key taches that are rooted in the regional landscape pattern.They include:first,evaluating the landscape network and its public goods output and formulating a multi-functional network planning objective;second,identifying the land which has potential to produce public goods and the spatial pattern related to natural ecological process,and analyzing planning paths responding to natural ecosystem and urban function demands;third,developing a blue-green spatial layout framework consisting of three superimposed networks and then evaluating the planning performance of public goods output.