Determinants of urban tree canopy in residential neighborhoods: Household characteristics, urban form, and the geophysical landscape |
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Authors: | John H Lowry Jr Matthew E Baker R Douglas Ramsey |
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Institution: | (1) Present address: School of Geography, Earth Science & Environment, Faculty of Science, Technology & Environment, University of the South Pacific, Private Mail Bag, Laucala Campus, Suva, Fiji Islands;(2) Department of Geography & Environmental Systems, University of Maryland Baltimore Campus, 211 Sondhiem Hall, 1000 Hilltop Circle, Baltimore, MD 21250, USA;(3) Department of Wildland Resources, Utah State University, Logan, UT 84322–5230, USA |
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Abstract: | The aesthetic, economic, and environmental benefits of urban trees are well recognized. Previous research has focused on understanding
how a variety of social and environmental factors are related to urban vegetation. The aim is often to provide planners with
information that will improve residential neighborhood design, or guide tree planting campaigns encouraging the cultivation
of urban trees. In this paper we examine a broad range of factors we hypothesize are correlated to urban tree canopy heterogeneity
in Salt Lake County, Utah. We use a multi-model inference approach to evaluate the relative contribution of these factors
to observed heterogeneity in urban tree canopy cover, and discuss the implications of our analysis. An important contribution
of this work is an explicit attempt to account for the confounding effect of neighborhood age in understanding the relationship between human and environmental factors, and urban tree canopy. We use regression analysis
with interaction terms to assess the effects of 15 human and environmental variables on tree canopy abundance while holding
neighborhood age constant. We demonstrate that neighborhood age is an influential covariate that affects how the human and
environmental factors relate to the abundance of neighborhood tree canopy. For example, we demonstrate that in new neighborhoods
a positive relationship exists between street density and residential tree canopy, but the relationship diminishes as the
neighborhood ages. We conclude that to better understand the determinants of urban tree canopy in residential areas it is
important to consider both human and environmental factors while accounting for neighborhood age. |
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