基于生态系统服务权衡的城市增长边界划定——以大连市为例

Delineation of Urban Growth Boundary Based on Ecosystem Services Tradeoffs:A Case Study of Dalian,China

划定城市增长边界对协调城市扩张与生态环境保护之间的矛盾具有积极作用。以大连市为例,提出基于生态系统服务、多情景决策的城市增长边界划定流程,在评估2017-2019年产水量、土壤保持、碳固持、生境质量及生态休闲5种生态系统服务的基础上,利用有序加权平均(OWA)算子权衡生态系统服务并筛选生态红线保护区作为城市扩张限定边界的划定依据,最后,基于2010年、2015年和2020年大连市土地利用数据,通过GeoSOS-FLUS模型模拟2030年大连市城市增长边界。研究结果表明:2017-2019年大连市5种生态系统服务量年均值中等偏低,呈东北高、西南低的分布格局;生态红线保护区面积占研究区总面积的17.49%,连续分布于大连市东北部、分散分布于西南部;2030年城市增长面积占市域面积的15.71%,集中分布于该市西南部,划定结果呈现“组团型”城市网络,与大连市未来发展模式吻合。该研究可为大连市及其他类似城市增长边界的合理划定与管控提供借鉴。

The delineation of the urban growth boundary(UGB)in Dalian has a positive effect on coordinating the contradiction between urban expansion and ecological environment protection.Taking Dalian as an example,based on the evaluation of the 5 ecosystem services(ESs):water yield,soil conservation,carbon sequestration,habitat quality,and ecological leisure,the priority protection areas are selected based on the OWA(ordered weighted averaging)operator,making it an ecological red line protection zone,and the UGB of this city is obtained through the simulation of urban expansion by GeoSOS-FLUS model.The results are as follows.1)From 2017 to 2019,the annual average values of 5 ESs are moderately low in Dalian,with high values in northeast and low values in southwest.2)The area of the ecological red line protection zone accounts for 17.49%of the total area of the study area,which is continuously distributed in the northeast and scattered in the southwest of Dalian.3)While the flexible UGB area accounts for 15.71%of the city area in 2030 and is concentrated in the southwest of the city,the delineation results are consistent with the future development pattern of Dalian,showing a"cluster"development pattern.From the perspective of the tradeoffs of ecosystem services,the rational delineation of urban growth boundary is more conducive to the protection of ecological space,and provides reference for the reasonable management of UGB.