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Tree Cover Ratio Effects on Users’ Perceptions, Impressions and Suitability Judgment for Different Activities in Privately Owned Public Spaces

People are drawn to natural settings because they instinctively associate them with providing, nurturing environments. Many studies have linked higher urban greenery ratios to social, psychological, economic, and human health improvements. While urban greenery benefits a large number of people, the monetary burden of its installation and maintenance falls typically to local governments or private entities, requiring urban designers to be able to justify the higher costs of implementation and maintenance. 
To date, there is still no precise data linking tree cover ratio and the specific effects it has on peoples’ perceptions and impressions of urban plazas or in the environment’s suitability for different activities. This study expands on the findings of previous studies to explore the effects of tree cover ratio and environment scale across twenty-three different evaluation scales. 
It used immersive virtual environments to control for confounding variables and head-mounted displays to present the stimuli, allowing participants to experience the environment in its totality as in a natural setting. 
Higher tree cover ratios improved participants’ willingness to stay and pay for goods, improved perception, impressions, and how suitable the environment was for different activities. The specific effects on five measurement scales for activities, nine measurement scales for impression and seven different measurement scales for perception are shown as well as the effects of the interaction of tree cover ratio and environment scale.The effects of sex and architectural background are also tested and discussed. Results offer designers with evidence for the definition of tree amount in relation to environment scale, based on the desired effect.