Research ArticleArticles

Predicting Root Spread From Trunk Diameter and Branch Spread

Edward F. Gllman
Arboriculture & Urban Forestry (AUF) April 1988, 14 (4) 85-89; DOI: https://doi.org/10.48044/jauf.1988.021

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  • Table 1.

    Straight line equations for the relationship between branch crown radius and root spread radius.

    Speciesb0b1r
    Southern magnolia−0.533.77a.98**
    Live oak1.610.36b.23
    Red maple−0.163.06a.97**
    Honeylocust−1.022.95a.99**
    Poplar−0.633.08a.74*
    Green ash01.68a.99**

    • y = b0 + b1 x where: y = root radius (m), b0 = y intercept, b1 = slope of line, x = crown radius (m), r = correlation coefficient

    • ↵* Significant at the 0.05 level.

    • ↵** Significant at the 0.01 level.

  • Table 2.

    Straight line equations for the relationship between trunk diameter and root spread radius.

    Speciesb0b1r
    Southern magnolia−0.620.53a.99**
    Live oak0.920.20c.41
    Red maple0.170.38b.82*
    Honeylocust0.420.35b.79*
    Poplar1.130.20c.83*
    Green ash0.100.30b.97**

    • y = b0 + b1 x where: y = root radius (m), b0 = y intercept, b1 = slope of line, x = trunk diameter (cm), r = correlation coefficient

    • ↵* Significant at the 0.05 level.

    • ↵** Significant at the 0.01 level.

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Predicting Root Spread From Trunk Diameter and Branch Spread
Edward F. Gllman
Arboriculture & Urban Forestry (AUF) Apr 1988, 14 (4) 85-89; DOI: 10.48044/jauf.1988.021
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