都市圈接合区土地利用转型过程与机制研究——以成渝中部地区为例

Study on Process and Mechanism of Land Use Transition in Metropolitan Joint Area:A Case Study of Central Chengdu-Chongqing Region

以典型都市圈接合区成渝中部地区为例,在经济社会发展阶段识别的基础上,以土地利用转移矩阵、空间自相关分析方法测度2000—2020年区域土地利用转型特征,并综合应用最小二乘回归与地理加权回归方法,探究土地利用转型影响因素与驱动机制。结果表明:(1)2000—2020年,成渝中部地区土地利用转型特征表现为耕地面积由相对稳定转向减少;建设用地规模急速扩张,热点区由分散转向集中,由重庆市主城区边缘向外围拓展。(2)都市圈接合区土地利用转型过程是政策制度因素、自然环境条件、行政边界效应、经济社会转型等多因素综合作用的结果。行政边界效应是驱动区域土地利用转型的特色因素,其作用过程呈现中介特征。(3)行政边界效应的存在导致区域生态空间管控不力,建设用地无序扩张与供给不足并存,加剧土地利用冲突。应进一步形成推进跨区域国土空间一体化治理的综合性理论方法体系与系统性政策行动路径,这对促进现代化都市圈建设与实现城市群一体化及可持续发展具有重要意义。

Taking the central Chengdu-Chongqing region as an example,this paper uses the land use transfer matrix and spatial autocorrelation analysis method to measure the characteristics of regional land use transition from 2000 to 2020,and comprehensively applies the OLS and GWR methods to explore the influencing factors and driving mechanism of land use transition in metropolitan joint area.The results showed that:(1)During the study period,the process of land use transition occurred in central Chengdu-Chongqing region.In this process,the scale of cropland changes from relatively stable to declining.The scale of construction land has expanded rapidly,and the hot spots area have changed from dispersion to concentration,expanding from the edge of the main urban area of Chongqing to the periphery.The scale of forest land and grassland decreased,especially in some western regions.The expansion of water area in central Chengdu-Chongqing region is accelerated,and the hot spots area are concentrated in the main producing areas of agricultural products and urbanization areas.(2)The land use transition in metropolitan joint area is the result of the comprehensive action of many factors,such as policy and institutional factors,natural environmental conditions,administrative boundary effect,socio-economic transition and so on.The intensity of influencing factor has spatial heterogeneity.The process of socio-economic is the core factor that driving the land use transition.The administrative boundary effect is the characteristic factor driving the regional land use transition and its function process presents intermediary characteristics.(3)The existence of administrative boundary effect leads to poor control of ecological space,disorderly expansion and insufficient supply of construction land,aggravating land use conflict,and seriously affecting the sustainable use of land in metropolitan joint area.Therefore,a systematic policy path of regional land and space integration governance should be furtherly formed,which is of great significance to promote the construction of modern metropolitan area and realize the integrated and sustainable development of urban agglomeration.