Table 2.

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

Species	b₀	b₁	r
Southern magnolia	−0.62	0.53a	.99^**
Live oak	0.92	0.20c	.41
Red maple	0.17	0.38b	.82^*
Honeylocust	0.42	0.35b	.79^*
Poplar	1.13	0.20c	.83^*
Green ash	0.10	0.30b	.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.