Predicting Root Spread from Trunk Diameter and Branch Spread    (View PDF)

Edward F. Gilman

Abstract: Trunk diameter and branch crown spread were linearly correlated with root spread in honeylocust (Gleditsia triacanthos var. inermis), green ash (Fraxinus pensylvanica), poplar (Populus x generosa), red maple (Acer rubrum) and southern magnolia (Magnolia grand/flora) but not in live oak (Quercus vlrginiana). Maximum root spread (excluding live oak) ranged from 1.68 times the dripline for ash to 3.77 for magnolia. Mean maximum root spread was 2.9 times the dripline. Roots growing farthest from the trunk were consistently near the soil surface.

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https://doi.org/10.48044/jauf.1988.021