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城市活力作为中国城市可持续发展的重要表征，与建成环境之间呈现复杂关系。该文以西安市主城区为研究区，基于百度热力图测度城市活力，并构建“5D”建成环境评价指标体系，运用CatBoost-SHAP模型与GeoVisX空间可视化技术解析建成环境对城市活力在工作日和休息日的影响机制。结果表明：西安市主城区工作日与休息日城市活力特征不同，工作日呈单峰特征，休息日则表现为双峰特征，整体活力水平高于工作日；建成环境对城市活力的影响呈现明显的空间异质性，中心区域作用显著强于外围区域，但商业设施密度与交通设施密度为持续性关键要素；建成环境因素与城市活力间存在非线性关系及阈值效应，不同建成环境因素间具有协同效应，表明城市活力的形成源于多因子耦合作用。研究结果揭示了建成环境因素对城市活力影响的空间异质性规律、非线性特征以及双指标协同效应，可为提升城市活力提供科学依据。
Abstract：Urban vitality, a key indicator of the sustainable development of China′s cities, exhibits a complex relationship with the built environment.To deeply explore this complex relationship, this study takes the main urban area of Xi′an as a case study and conducts the study by integrating multi-source big data.Firstly, the urban vitality is measured based on Baidu Heat Map, and the "5D" built environment index system is constructed by integrating multi-source data such as POI,OSM,and NDVI.Then, the CatBoost-SHAP model and GeoVisX spatial visualization technology are adopted to analyze the influence mechanism of the built environment on urban vitality on both weekdays and rest days.It is found as follows.(1) Urban vitality characteristics differ between weekdays and rest days: weekdays exhibit a single-peak pattern, while rest days show a double-peak pattern, with an overall vitality level slightly higher than that on weekdays.(2) The influence of the built environment on urban vitality displays significant spatial heterogeneity.The effect is markedly stronger in central areas than in peripheral areas, with commercial facility density and transportation facility density identified as key factors for sustainability.(3) Nonlinear relationships and threshold effects exist between built environment factors and urban vitality.Different built environment factors exhibit synergistic effects, indicating that urban vitality arises from the coupling of multiple factors.This study reveals the spatial heterogeneity laws, nonlinear characteristics and dual-index synergy effects of the influence of built environment factors on urban vitality, providing a scientific basis for enhancing urban vitality.
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基本信息:
DOI：
中图分类号:TU984;P208
引用信息:
[1]刘蓓,胡新玲,何浩.基于CatBoost-SHAP模型的建成环境对城市活力影响机制——以西安市主城区为例[J].地理与地理信息科学,2025,41(06):7-15.
基金信息:
国家自然科学基金地区基金项目（52468004）