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Table I
Least square means for loblolly pine average Dbh, average height, basal area, and total volume by site preparation treatment and age.
| Treatment | Age 6 | Age 9 | Age 12 | Age 15 | Age 18 | Age 21 |
|---|---|---|---|---|---|---|
| Average Dbh (cm) | ||||||
| Burn only | 4.8 (a) | 9.1 (a) | 12.4 (a) | 14.7 (a) | 17.0 (a) | 19.3 (a) |
| Chop-burn | 6.4 (b) | 11.7 (b) | 15.0 (b) | 17.3 (b) | 19.6 (b) | 21.6 (bc) |
| Shear-pile-disk | 7.1 (bc) | 12.2 (b) | 15.5 (b) | 17.3 (b) | 19.1 (b) | 20.8 (b) |
| Chop-herbicide-burn | 7.1 (bc) | 12.2 (b) | 15.2 (b) | 17.5 (b) | 19.6 (b) | 21.3 (bc) |
| Herbicide-burn | 7.9 (c) | 12.4 (b) | 15.7 (b) | 17.5 (b) | 19.6 (b) | 21.3 (bc) |
| Herbicide-burn-herbicide | 10.7 (d) | 15.0 (c) | 17.8 (c) | 19.3 (c) | 20.8 (c) | 22.4 (c) |
| Average height (m) | ||||||
| Burn only | 3.9 (a) | 6.7 (a) | 9.8 (a) | 12.2 (a) | 14.9 (a) | 17.4 (a) |
| Chop-burn | 4.7 (b) | 7.9 (b) | 11.3 (b) | 13.7 (b) | 16.6 (b) | 19.1 (b) |
| Shear-pile-disk | 4.9 (bc) | 8.1 (b) | 11.6 (b) | 14.0 (b) | 16.9 (b) | 19.4 (bc) |
| Chop-herbicide-burn | 5.0 (bc) | 8.2 (b) | 11.6 (b) | 14.0 (b) | 16.8 (b) | 19.2 (b) |
| Herbicide-burn | 5.3 (c) | 8.6 (b) | 11.9 (b) | 14.3 (b) | 17.1 (b) | 19.5 (bc) |
| Herbicide-burn-herbicide | 6.4 (d) | 9.8 (c) | 13.2 (c) | 15.6 (c) | 18.2 (c) | 20.2 (c) |
| Basal area (m2 ha−1 ) | ||||||
| Burn only | 2.8 (a) | 8.4 (a) | 14.3 (a) | 9.4 (a) | 24.1 (a) | 26.7 (a) |
| Chop-burn | 4.2 (ab) | 12.4 (b) | 19.6 (b) | 25.5 (b) | 30.4 (b) | 33.1 (b) |
| Shear-pile-disk | 5.6 (bc) | 15.4 (bc) | 23.4 (b) | 29.4 (b) | 34.0 (bc) | 36.8 (bc) |
| Chop-herbicide-burn | 5.4 (bc) | 14.3 (bc) | 21.8 (b) | 27.7 (b) | 32.8 (b) | 35.4 (bc) |
| Herbicide-burn | 6.6 (c) | 15.7 (c) | 23.3 (b) | 28.9 (b) | 33.5 (b) | 36.2 (bc) |
| Herbicide-burn-herbicide | 11.1 (d) | 22.1 (d) | 29.3 (c) | 34.5 (c) | 38.4 (c) | 39.6 (c) |
| Total volume (m3 ha−1) | ||||||
| Burn only | 7.9 (a) | 35.3 (a) | 80.3 (a) | 128.4 (a) | 187.6 (a) | 234.3 (a) |
| Chop-burn | 12.4 (ab) | 55.1 (b) | 115.3 (b) | 175.5 (b) | 245.5 (b) | 301.3 (b) |
| Shear-pile-disk | 17.4 (bc) | 69.4 (bc) | 141.1 (bc) | 206.3 (b) | 280.2 (b) | 337.7 (bc) |
| Chop-herbicide-burn | 16.8 (bc) | 65.4 (bc) | 131.1 (bc) | 194.5 (b) | 268.6 (b) | 323.3 (b) |
| Herbicide-burn | 21.3 (c) | 74.0 (c) | 143.2 (c) | 206.4 (b) | 277.6 (b) | 334.9 (bc) |
| Herbicide-burn-herbicide | 40.4 (d) | 113.1 (d) | 194.4 (d) | 264.3 (c) | 334.1 (c) | 375.5 (c) |