Free Access
Table IV
Allometric equations of heartwood radius (HR, cm) against xylem radius (XR, cm) for the seven tree species. The heartwood initiation xylem radius (HIXR, cm) is extrapolated from the equations. N and R2 are sample size and determination coefficient. The equations are all significant (P < 0.001).
| Tree species | N | Allometric equation | R 2 | HIXR |
|---|---|---|---|---|
| Korean pine | 102 | HR = 0.84XR − 0.97 | 0.970 | 1.5 |
| Dahurian larch | 131 | HR = 0.94XR − 2.01 | 0.979 | 2.1 |
| Japanese elm | 146 | HR = 0.97XR − 0.54 | 0.996 | 0.6 |
| Manchurian ash | 142 | HR = 0.93XR − 0.74 | 0.988 | 0.8 |
| Manchurian walnut | 154 | HR = 0.96XR − 0.82 | 0.988 | 0.9 |
| Amur cork-tree | 144 | HR = 0.96XR − 0.23 | 0.998 | 0.2 |
| Mongolia oak | 73 | HR = 0.89XR − 0.41 | 0.987 | 0.5 |