How do Urban Green Spaces (UGS) generate trade-offs and synergies in promoting residents’ physical activity and supporting psychological restoration? This study addresses this question by examining the coupling coordination between Outdoor Activity Density (OAD) and Environmental Emotional Experience (EE) and directly and indirectly accessible green spaces. quantifying Urban Green Spaces (UGS) in three dimensions: accessibility (direct contact), and availability and visibility (indirect contact, such as visual exposure or ecological benefits). Outdoor Activity Density (OAD) was derived from mobility data on an outdoor activity platform, and Environmental Emotional Experience (EE) from social media text. A coupling coordination model was used to assess the relationship between UGS, physical activity, and psychological health, while spatial machine learning models explored the nonlinear effects of UGS morphology and socioeconomic factors on OAD and EE. The findings revealed: (1) Outdoor Activity Density and Environmental Emotional Experience, along with UGS, exhibit a multi-centered clustering tendency; (2) The visibility of Urban Green Spaces has a stronger promotional effect on Outdoor Activity Density than on Environmental Emotional Experience, although an overly dense green visibility range may hinder activity; (3) The accessibility of Urban Green Spaces has a dual enhancement effect on both Outdoor Activity Density and Environmental Emotional Experience; (4) The availability of Urban Green Spaces, as a form of indirect contact, provides positive Environmental Emotional Experience for those who cannot directly access green spaces; (5) Less "wild" Urban Green Spaces (artificial, low-LSI) tends to strengthe0n Outdoor Activity Density more effectively. Our findings address a key dilemma in urban planning by showing how green spaces can balance physical activity and psychological health when their optimal designs may conflict, and by empirically identifying the spatial morphology and scale ranges most suitable for both outcomes.
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