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