Observations of “coarse” root development in young trees of nine exotic species from a New Zealand plot trial

New Zealand Journal of Forestry Science

Table 7 Allometric relationships for trialled species

Species	Root-collar diameter (x, mm) vs total root length (y, m)	R²	Root-collar diameter (x, mm) vs below-ground biomass (y, g)	R²
Redwood	y = 0.02x ^1.97	0.72	y = 0.02x ^2.36	0.94
Oak	y = 0.03x ^1.81	0.97	y = 0.19x ^1.93	0.94
Eucalypt	y = 0.002x ^2.31	0.99	y = 0.002x ^2.87	0.98
Douglas-fir	No data		No data
Cherry	y = 0.026x ^2.05	0.80	y = 0.04x ^2.5	0.83
Blackwood	y = 0.017x ^2.01	0.91	y = 0.012x ^2.66	0.95
Alder	y = 0.027x ^2.19	0.89	y = 0.09x ^2.31	0.93
Cypress	y = 0.063x ^1.90	0.87	y = 0.04x ^2.41	0.84
Radiata pine	y = 0.064x ^1.62	0.88	y = 0.014x ^2.46	0.96

Relationships are shown between root collar diameter and total root length >1 mm diameter (m) and below-ground biomass (g)