【摘要】 合理的空间结构是城市群实现区域经济协同发展的重要基础。针对基于统计数据分析城市群空间结构变化存在的现势性不强、数据获取难度较大的问题，综合利用夜间灯光遥感数据和土地利用数据，提取1995～2020年长江中游城市群的城市建成区，分析了城市群内部空间结构的时空演变特征；借助分形思想，结合形态维数、关联维数和聚集维数探讨了长江中游城市群空间结构的差异性、相关性和聚集性特征。分析发现，25 a内，长江中游城市群呈现出由中心向四周的“边缘式扩展”特征，内部城市建成区沿河流“条带”分布性特征较为明显。形态维数结果表明武汉城市圈发展态势相对优良，城市扩张较为稳定有序；关联维数结果体现出环长株潭城市群内部结构相似度较高，发展协同性更好；聚集维数启示着环鄱阳湖城市群内部城市扩张强度不一致，核心带动作用不够稳定。研究结果有助于长江中游城市群发挥区位优势，促进省际毗邻城市均衡化、一体化发展。更多还原

【Abstract】 A reasonable spatial structure is an essential foundation for urban agglomerations to achieve regional economic synergistic development. The use of statistical data to analyze changes in urban agglomerations has problems such as weak presentability and difficulty of data acquisition. To address this problem, this study proposed a method for extracting the built-up areas by using the nighttime light remote sensing data and land use data. Considering the Middle Reaches of Yangtze River Urban Agglomerations(MRYRUA) as a case study, this study presented a two-step method for the spatial-temporal fractal analysis. First, the spatial and temporal evolution characteristics of spatial structure within the urban agglomerations were analyzed on the basis of the results of the built-up areas of the MRYRUA from 1990 to 2020. Furthermore, with the help of fractal theory and the combination of morphological, correlation, and aggregation dimensions, the morphological, correlation, and aggregation characteristics of the spatial structure of the MRYRUA were discussed. It was observed that within the period of 25 a, the MRYRUA exhibited marginal expansion from the center to the surroundings. In contrast, the urban built-up areas within the MRYRUA were distributed along the rivers in a more pronounced strip-like pattern. The results of the morphological dimension indicated that the development of the Wuhan Metropolitan was relatively well-managed, with a stable and orderly expansion of cities. The results of the correlation dimension demonstrated that the structure of the Chang-Zhu-Tan Urban Agglomeration exhibited a higher degree of similarity, suggesting a more effective synergy of development. The aggregation dimension indicated that the intensity of expansion of cities in the Urban Agglomeration around Poyang Lake was inconsistent, suggesting that the core driving role was not yet stable. The findings of this study facilitated the full exploitation of the advantageous geographical position of the MRYRUA, thereby facilitating the balanced and integrated development of neighboring cities across provincial boundaries.更多还原