城市群空间结构对城市群空间扩张模式与形态的影响——兰西城市群和宁夏沿黄城市群比较  

The influence of spatial structure of urban agglomeration on spatial expansion patterns and forms: comparison between Lanzhou-Xining urban agglomeration and Ningxia urban agglomeration along the Yellow River

作　　者：王录仓[1,2] 屈艳琦 武潼 Lucang Wang;Yanqi Qu;Tong Wu(College of Geography and Environmental Science/,Northwest Normal University,Lanzhou 730070,China;Key Laboratory of Resource Environment and Sustainable Development of Oasis,Northwest Normal University,Lanzhou 730070,China)

机构地区：[1]西北师范大学,地理与环境科学学院,甘肃兰州730070 [2]西北师范大学,甘肃省绿洲资源环境与可持续发展重点实验室,甘肃兰州730070

出　　处：《中国沙漠》2024年第3期63-74,共12页Journal of Desert Research

基　　金：国家自然科学基金面上项目(42371219);绿洲科学科研成果突破行动计划项目(NWNU-LZKX-202302)。

摘　　要：城市群是参与全球竞争的战略高地、中国新型城镇化的重要载体和区域高质量发展的增长极,也是空间扩张最突出的地区。然而受城市群空间结构的底层影响,其扩张模式和形态存在着一定的异质性。在定义城市群空间结构的基础上,应用夜间灯光数据系统地研究了兰西城市群和宁夏沿黄城市群空间扩张的模式和形态。结果表明:(1)两大城市群均以边缘式扩张为主,飞地式扩张为辅。2011—2015年,兰西城市群飞地式扩张高于宁夏沿黄城市群,2016—2020年,宁夏沿黄城市群飞地式扩张较突出。双核心-双省份城市群更偏好在异地寻求新的发展空间,而单核心城市群偏好空间蔓延。填充式扩张普遍不足,表明城市群空间融合态势较弱。(2)斑块个数NP和斑块加权平均分维度FRAC_AM兰西城市群高于宁夏沿黄城市群,而斑块结合度指数COHENSION、斑块聚合度指数AI、斑块密度PD兰西城市群均低于宁夏沿黄城市群,说明双核心-双省份城市群扩张更明显、形态更复杂,破碎化程度更高,空间离散性更突出。NP、PD指数递增,而AREA_MN指数递减,AI、COHENSION指数先升后降,表现出一定的趋同性,但双核心-双省份城市群变化速率较快,暗示双核心、跨省区的分布特征,实际上降低了斑块密度、抑制了斑块的聚合、拉大了斑块的分离,更不利于城市群空间结构的优化。Urban agglomerations are strategic highlands for participating in global competition,important carriers of China's new urbanization,growth poles for high-quality regional development,and also the most prominent areas for spatial expansion.However,due to the underlying influence of the spatial structure of urban agglomerations,there is a certain degree of heterogeneity in their expansion patterns and forms.On the basis of defining the spatial structure of urban agglomerations,this paper systematically studied the patterns and forms of spatial expansion in the Lanzhou-Xining urban agglomeration and the Ningxia Yellow River urban agglomeration using nighttime light data.The results showed that:(1)Both urban agglomerations were mainly characterized by marginal expansion,with enclave expansion as a supplement.From 2011 to 2015,the enclave style expansion of the LXUA was higher than that of the NXUA.From 2016 to 2020,the enclave style expansion of the NXUA was outstanding.Implying that dual core-dual province urban agglomerations prefer to seek new development space in different locations(spatial discontinuity),while single core urban agglomerations prefer spatial sprawl(spatial continuity).Filling expansion is generally insufficient,indicating a weak trend of spatial integration in urban agglomerations.(2)The NP and FRAC-AM of the LXUA are higher than those of the NXUA,indicating that the expansion of the dual core dual province urban agglomeration is more obvious and the form is more complex;The COHENSION,AI,and PD indices of the LXUA are lower than those of the NXUA,indicating a higher degree of fragmentation and more prominent spatial dispersion in the dual core dual province urban agglomeration.The NP and PD indices of the two major urban agglomerations are increasing,while the FRAC-AM index decreases,while AI and COHENSION first increase and then decrease,showing a certain degree of convergence.However,the change rate of the dual core dual provincial urban agglomeration is relatively fast,indicating the distribut

关 键 词：城市群空间结构 扩张模式 扩张形态 兰西城市群 宁夏沿黄城市群 

分 类 号：K901.8[历史地理—人文地理学]