Contemporary Concepts of Root System Architecture of Urban Trees

The relationship between tree height and maximum root radius from summarized literature. R² = 0.359 and p = 0.002. Dashed lines represent 95% confidence interval. When data for conifers and deciduous species were analyzed separately, data was transformed to achieve a more constant variance and relationships were as follows: Deciduous: p = 0.25 and R² = 0.09 Conifers: R² = 0.28 p = 0.18. Each data point represents a study average, see Appendix for data sources and N values.