协调发展视角下大南昌都市圈城市增长边界的划定

Delineation of Urban Growth Boundary for the Great Nanchang Metropolitan Area from the Perspective of Coordinated Development

科学划定城市增长边界(UGB)能合理引导城市发展方向,有效抑制无序蔓延。基于协调发展视角,结合多目标土地利用适宜性评价方法与PLUS模型划定大南昌都市圈刚性UGB及自然增长、政策约束、协调发展3种情景下的弹性UGB。结果表明:①多目标土地利用适宜性呈现空间差异且存在重叠和交叉,协调发展最适宜区与农业生产最适宜区、生态保护最重要区重叠面积相比城镇建设最适宜区均有所下降;②刚性UGB面积占研究区总面积的76.11%,保障大南昌都市圈城市扩张严格遵循生态保护红线和粮食安全底线;③PLUS模型模拟结果总体呈耕地、林地、草地、未利用地减少以及水域和建设用地增加的趋势,其中建设用地扩张最显著,但协调发展情景下城市扩张得到有效约束,且该情景下弹性UGB能有效减缓城市扩张占用农业或生态价值最高区域,更能优化城市景观格局。研究结果有利于引导和实现大南昌都市圈城市可持续发展,也可为其他城市三生空间协调发展提供参考。

The delineation of urban growth boundary(UGB)can reasonably guide the direction of urban development and effectively restrain urban sprawl.From the perspective of coordinated development,this paper combined the multi-objective land use suitability evaluation method and the PLUS model to define the rigid UGB of the great Nanchang metropolitan area and the elastic UGB under three scenarios of natural growth,policy constraints and coordinated development.It is found as follows.①The spatial distribution of multi-objective land use suitability presents the characteristics of differences,overlaps and crosses.The overlapping area of the most suitable areas for coordinated development with the most suitable areas of agriculture and the most critical areas of ecological protection has decreased compared with the most suitable areas of urban construction.②The area within rigid UGB is 35391.03 km 2,accounting for 76.11%of the total area of the study area,which can effectively control the urban expansion of the great Nanchang metropolitan area without breaking through the red line of ecological protection and the bottom line of food security.③The simulation results based on the PLUS model showed that arable land,forest land,grassland and unused land decreased,while water area and construction land increased.The expansion of construction land was the most significant,and urban expansion was effectively constrained under the coordinated development scenario,the elastic UGB under the coordinated development scenario can effectively slow down the occupation of the areas with the highest agricultural or ecological value by urban expansion,and can better optimize the urban landscape pattern.The results are helpful to guide and realize the sustainable development of the great Nanchang metropolitan area,and can also provide reference for the coordinated development of production-living-ecology space in other types of cities.