To explore the relationship between arbor root density and corresponding physical soil properties (total porosity, non-capillary porosity, specific weight, bulk density, moisture content, and permeability), noninvasive methods such as Tree Radar Unit (TRU) were utilized to detect the root systems of 10 species of tree that are commonly used in Shanghai green spaces with more than 70% frequency of occurrence. Using TRU and soil investigation, root density and soil porous features were determined for different tree species, depth slices, and distances. The relationships among root density, soil porosity, and non-capillary porosity were identified using variance analysis and regression analysis. The results indicated that root density decreased with increasing distance from the trunk and soil depth. Soil porosity and non-capillary porosity had significantly positive and linear correlations with root density. Compared with lawns, trees such as Zelkova serrata, Koelreuteria paniculata, Cinnamomum camphora, and Metasequoia glyptostroboides had the greatest effects on soil improvement through soil porosity and non-capillary porosity. Due to the spatial distribution of root systems, trees could be divided into three types based on their influence at various soil depths.

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This exploratory study employed an integrated methodological approach to examine the relationship among several factors for residents in Shanghai when it came to the use of urban park spaces. The study was conducted using two sample groups of 1200 residents each, and around three community parks that contained a variety of recreation-related impacts. Open-ended and closed-ended questionnaires and correspondence analysis were used to reflect residents' basic attitudes, recreational perception, and satisfaction evaluation by Importance Performance Analysis (IPA) method, and mirrored preferences for future development of community parks. The results suggest that for residents, high levels of satisfaction with landscape and environment were advantages, but recreation space and facility were critical for the perception of the community parks. In comparison, management was found to be an opportunity factor to improve leisure satisfaction. The findings emphasized landscape, environment, space, facility, and management as elements that enhance recreational perception and avoid passive interference.

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