To what extent does the density of the tree cover in a city relate to the amount of social capital among neighbors? To address this question, we linked social survey data (N = 361) from the Baltimore Ecosystem Study with socioeconomic, urban form, and green space data at the census block group level using a geographic information system. We found a systematically positive relationship between the density of urban tree canopy at the neighborhood block group level and the amount of social capital at the individual level (r = .241, p < .01). Multiple regression analyses showed that tree canopy added a 22.72% increase in explanatory power to the model for social capital. This research adds a new variable—neighborhood tree canopy—to the typologies of green space that affect human social connection. Trees are a relatively inexpensive and easy intervention to enhance the strength of social ties among neighbors.
The natural environment contributes to human wellbeing in a variety of ways, including providing outdoor recreation venues and underpinning cultural practices. Understanding whether the diversity of human-nature experiences significantly relate to overall subjective wellbeing, however, is rarely explored. Using results from 4418 respondents to an online survey conducted in Washington's Puget Sound region, we describe the relationship between overall life satisfaction and diverse metrics of how people engage with the natural environment. We found that eleven of the thirteen tested metrics had a small but positive correlation to overall life satisfaction and specific groupings of environment-specific social indicators were internally reliable constructs that predicted life satisfaction. These included: Sense of Place, Outdoor Activities, Good Governance, Social and Cultural Activities, Psychological Well- being, and Resource Access. This research empirically demonstrates that a variety of mechanisms for engaging the natural environment significantly contribute to overall subjective wellbeing.
