基于步行元分维模型的旧城中心区土地混合利用“非均衡发展”机制解析及调控方法——以南京为例

如何实现高质量的土地混合利用，已成为我国存量更新背景下旧城中心区品质提升的重要议题。但传统观念偏重于局部地段的“功能混合”单维度开发，导致中心区土地混合利用“非均衡发展”现象严重，与新时期需求相悖。基于此，课题选取长期关注中心区更新的典型城市南京，秉持以往被忽视的动态评价视角，解析“非均衡发展”演变特征规律并提出相应调控方法：①从土地混合利用空间多维内涵特征出发，建立多层次评价指标体系及数据库；②构建“步行元分维模型”动态评价框架，依托ArcGIS和SPSS软件平台，运用空间自相关分析、空间一致性分析、相关性分析、层次分析等方法，揭示1980年以来“非均衡发展”的演变特征及内在规律；③根据特征规律识别调控目标，在传统宏、中观普适化调控方法基础上，提出具有差异化、精细化特征的微观层面调控方法。课题成果将有助于深化对我国旧城中心区土地混合利用规律的认知，并为中心区品质提升实践提供参考依据。

How to achieve the high-quality mixed-use development has become an important discussion topic for the quality improvement of inner city central area under the background of inventory regeneration in China. However, the traditional thoughts focus on the single-dimensional development of “mixed land use” in local space, it has led to increasingly serious “unbalanced evolution” in mixed-use development of inner city central area, which is contrary to the needs of the new period. Therefore, this project takes Nanjing, a typical city that has been paying attention to the regeneration in inner city central for a long time, as an example, and from the perspective of dynamic evaluation that has been neglected in the past, to examine the law of "unbalanced evolution" and put forward the corresponding regulate method：①Based on multidimensional space connotation characteristics of mixed-use development, establish a multi-level evaluation indicator system and database; ②Construct the dynamic evaluation framework of “Pedestrian-oriented Meta Fractal Dimension Model”, and it relies on ArcGIS and SPSS software platforms and uses spatial autocorrelation analysis, spatial consistency analysis, correlation analysis, analytic hierarchy and other methods to reveal the evolution characteristics and internal laws of "unbalanced evolution" since 1980;③Identify regulatory targets according to laws, on the basis of the traditional macro and meso universal regulate methods, it puts forward the micro-level regulation method with the characteristics of differentiation and refinement. The project results will deepen the understanding of the law of mixed-use development in inner city central area and provide reference basis for the practice of quality-improvement in the central area.