Table 4. Prediction of stand growth change after applying the current thinning standard in Chamaecyparis obtusa plantations with 3,000 trees per ha.
Thinning prescriptions | Thinning methods | DBH(cm) | Height(m) | Stand density(trees・ha−1) | Volume(m3・ha−1) | Thinning intensity(%) |
Order | Age | Before/After |
A | 1st | 25 | Before | 15.1 | 14.0 | 2,431 | 273.8 | 26.0 |
After | 16.8 | 14.0 | 1,800 | 256.7 |
2nd | 35 | Before | 18.6 | 17.2 | 1,686 | 357.8 | 40.7 |
After | 22.6 | 17.2 | 1,000 | 314.4 |
3rd | 45 | Before | 24.3 | 19.8 | 966 | 401.7 | 27.5 |
After | 27.2 | 19.8 | 700 | 366.2 |
4th | 60 | Before | 29.0 | 22.9 | 678 | 467.4 | 48.5 |
After | 36.4 | 22.9 | 350 | 379.1 |
B | 1st | 23 | Before | 13.6 | 11.3 | 2,602 | 191.5 | 22.7 |
After | 14.8 | 11.3 | 2,011 | 178.9 |
2nd | 30 | Before | 16.1 | 13.5 | 1,932 | 241.1 | 37.7 |
After | 18.9 | 13.5 | 1,205 | 208.8 |
3rd | 50 | Before | 22.1 | 18.1 | 1,128 | 357.1 | 28.9 |
After | 25.0 | 18.1 | 802 | 323.6 |
C | 1st | 20 | Before | 12.1 | 9.1 | 2,730 | 129.7 | 8.4 |
After | 12.3 | 9.1 | 2,500 | 126.1 |
2nd | 30 | Before | 14.1 | 11.8 | 2,370 | 200.0 | 36.7 |
After | 16.5 | 11.8 | 1,500 | 172.8 |