Search

The supply-demand relationship between the daily activities of urban residents and the environment is closely related to the quality of urban life. In the context of the interweaving and overlapping of old and new supply-demand contradictions, as well as the rapid development of new ideas and technologies, the complex supply-demand matching characteristics and influencing mechanisms of urban residents' daily activities and the environment need to be further clarified to provide useful reference for the optimization of urban living space quality. Using the theories of temporal-spatial behavior and space of flows, this study establishes the theoretical framework and measurement index of the supply demand relationship between daily activities and the environment. Based on the utilization of geographical big data, the ANP (Analysis Network Process)-CV (Coefficient of variation) weighting method, Random Forest regression model, and other technical means, an empirical analysis is carried out for the central urban area of Nanjing. The main conclusions are as follows: 1) The supply-demand matching relationship between daily activities and the environment presents a composite spatial structure dominated by "center-periphery" relations and supplemented by "circle layer," style with significant polarization. 2) The supply-demand matching mechanism of daily activities and the environment is asymmetrical and non-sustainable. Daily activities are shaped more by the activity environment, in which the social environment plays a major role. At the same time, the trend of mutual promotion between supply and demand often does not lead to sustainable growth. 3) To a certain extent, in the central urban area of Nanjing, the distribution of daily activities and environmental factors, as well as their supply and demand relationships, have issues of one-way agglomeration and disorderly spread as well as the tension and inefficiency of supply and demand matching. A livable and inclusive social environment is the primary driving force affecting the level of daily activities, and the scale and intensity of activities are the main factors driving the enhancement of the environmental quality of activities. 4) The positive supply-demand interaction between daily activities and the environment should be promoted to improve the agglomeration and diffusion benefits of factors in the supply-demand network. According to the stages of the supply-demand development of the daily activities-environment system, flexible and diverse optimization paths should be selected to promote the high-quality sustainable development of supply and demand relations. Overall, this study makes certain innovations in the theoretical exploration and empirical analysis of the matching characteristics and the impact relationship between supply and demand. To match the feature recognition of supply and demand, the absolute level of supply and demand and relative benefit of supply and demand are presented simultaneously. To reveal the influence relationship, the significance, importance, and development trend of the nonlinear influence between supply and demand are thoroughly explored. Compared to related research on community life circles, this study covers the overall activity space of the city and considers different life activities and the multiscale spatial connections between life activities, which can more accurately and comprehensively reflect the panoramic living space of urban residents.

At present, the continuous improvement of urban residents' quality of life puts forward higher requirements for exploring the supply and demand of leisure walking. Against this background, this study focuses on leisure walking, taking the 15-minute community life circle as the space-time scope to re-examine the cumulative health effect of leisure walking as physical activity. Additionally, this study constructs a research framework to highlight the comprehensive benefits of leisure walking, including space-time opportunity and health promotion. Based on the research framework, this study uses comprehensive survey data from relevant communities in Nanjing to conduct an empirical study on the characteristics and influencing factors of leisure walking. The results show that the leisure walking of most residents makes it difficult to obtain comprehensive benefits, including space-time opportunity and health promotion. The built environment of the 15-minute community life circle significantly affects leisure walking based on the comprehensive benefits of space-time opportunity and health promotion. Specifically, the dense distribution of walkable paths has a promoting effect on overall residents and residents based on age and income stratification. In contrast, high-density population distribution and living locations far from the city center have an inhibitory effect. In addition, dense parks, high green coverage, and good public space accessibility positively affect stratified residents. The influence of individual attributes involves three aspects: socioeconomic attributes, health status, and family socioeconomic attributes. Specifically, overall or stratified residents with flexible and abundant leisure time and family members' accompanying behavior are more likely to participate in leisure walking and obtain more health benefits in a shorter space-time range. However, affected by the limited leisure time and poor physical condition, overall or stratified residents with a higher level of personal monthly income, families with children (