基于多源数据的成渝城市群绿色空间生态系统服务功能供需评价

Evaluation of Supply and Demand of Green Space Ecosystem Service Function in Chengdu-Chongqing Urban Agglomeration Based on Multi-source Data

随着城市规划逐步转向国土空间规划,准确掌握宏观尺度中的城市群绿色空间的服务特征成为规划决策的重要前提。基于多源数据,利用水量平衡方程、土壤流失方程、INVEST模型识别城市群绿色空间生态系统服务功能,利用Z-Score标准化评价生态系统服务功能供需平衡匹配的时空演变规律。结果显示:1)成渝城市群水源涵养服务供给、需求量整体提升;水土保持服务供给量提升,需求量降低;生物多样性维持服务供给量降低,需求区域由南部山林地转向城市群内部山脉区域;2)成渝城市群水源涵养服务整体需求量大于供给量,供需空间匹配严重不均;水土保持服务供给量大于需求量,供需空间基本匹配;生物多样性维持服务供需空间基本匹配,城市群外围区域显著优于中部区域。据此,提出成渝城市群中4种类型的城市单元,并基于其城市发展现状与生态系统服务状态提出规划策略,以期为成渝城市群发展规划提供科学依据。

With the gradual shift of urban planning to land space planning,it has become an important premise for planning and decision-making to accurately grasp the service characteristics of green space in urban agglomerations on a macro scale.Based on multi-source data,this research applies the water balance equation,soil loss equation and INVEST model to identify the green space ecosystem service functions of urban agglomeration,and uses Z-Score standardization to evaluate the spatial-temporal evolution law of supplydemand balance matching of ecosystem service functions.The results show that:1)The overall supply and demand of water conservation services have been improved in the Chengdu-Chongqing urban agglomeration.The quantity of water and soil conservation service is increased while the demand is reduced.The biodiversity maintenance service supply decreases,while the demand region shifts from the southern mountain region to the inner mountain region of the urban agglomeration.2)The overall demand for water conservation service is greater than the supply,and the space matching between the supply and demand is seriously uneven.The supply of water and soil conservation service is larger than the demand,and the space of supply and demand is basically matched.The space of supply and demand of biodiversity maintenance services is basically matched,and the peripheral areas of urban agglomeration are significantly better than the central areas.Accordingly,this research discusses and proposes four types of Chengdu-Chongqing urban agglomeration unit cities,and puts forward planning strategies based on its urban development status and ecosystem service state,providing a scientific basis for the development planning of Chengdu-Chongqing urban agglomeration.