Research Article
Effects of Catastrophic Insect Outbreaks on the Harvesting Solutions of Dahurian Larch Plantations
Table 1
Deterministic optimal solution with 3.5% interest rate.
| | Initial state | Dulaer 76 | Dulaer 80-2 | Yiershi 48 | Yiershi 53 | Yiershi 57 | Yiershi 58 | Yiershi 57 O-1 | Yiershi 57 O-2 | Yiershi 57 O-3 |
| | Biological age (yrs) | 28 | 24 | 30 | 33 | 25 | 28 | 24 | 22 | 20 | | Age at breast height (yrs) | 21 | 21 | 27 | 26 | 19 | 21 | 19 | 17 | 16 | | Elevation (m) | 809 | 829 | 893 | 904 | 907 | 857 | 907 | 908 | 910 | | Site index (SI, m) | 11.2 | 12.9 | 15.8 | 11.8 | 8.5 | 8.5 | 10.9 | 10.5 | 11.0 | | Dg (cm) | 12.9 | 10.9 | 14.1 | 13.8 | 10.5 | 12.9 | 12.8 | 14.2 | 13.0 | | Mean height (m) | 10.9 | 10.9 | 16.0 | 11.9 | 7.8 | 8.3 | 9.8 | 9.0 | 9.0 | | Basal area (m2/ha) | 30.0 | 18.5 | 39.1 | 37.3 | 19.4 | 34.5 | 29.3 | 32.5 | 28.0 | | Trees/ha | 2150 | 1875 | 2050 | 2100 | 2025 | 2250 | 2025 | 2100 | 1975 |
| | 1st thinning (yrs) | 33 | 29 | 35 | 38 | 30 | 33 | 29 | 27 | 25 | | Intensity (%) | 36.4% | 31.3% | 43.5% | 44.0% | 40.0% | 49.1% | 37.5% | 30.2% | 31.6% | | S-trees (%) | 40.0% | 28.0% | 40.0% | 40.0% | 40.0% | 18.0% | 40.0% | 40.0% | 40.0% | | M-trees (%) | 30.0% | 26.0% | 20.0% | 20.0% | 36.0% | 54.0% | 30.0% | 30.0% | 30.0% | | L-trees (%) | 100.0% | 100.0% | 92.5% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| | 2nd thinning (yrs) | 38 | 34 | 40 | 43 | 35 | 38 | 34 | 32 | 30 | | Intensity (%) | 27.1% | 26.8% | 31.1% | 32.1% | 44.1% | 41.1% | 32.1% | 34.9% | 30.6% | | S-trees (%) | 10.9% | 21.0% | 40.0% | 40.0% | 40.0% | 35.0% | 36.0% | 38.6% | 29.0% | | M-trees (%) | 30.0% | 30.0% | 30.0% | 30.0% | 33.2% | 38.0% | 32.0% | 36.0% | 36.5% | | L-trees (%) | 100.0% | 100.0% | 0.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| | 3rd thinning (yrs) | 43 | 39 | | 48 | 40 | 43 | 39 | 37 | 35 | | Intensity (%) | 26.3% | 23.0% | | 37.1% | 41.1% | 41.6% | 32.3% | 41.0% | 37.1% | | S-trees (%) | 0.0% | 0.0% | | 40.0% | 40.0% | 36.5% | 46.0% | 32.0% | 21.0% | | M-trees (%) | 30.0% | 30.0% | | 30.0% | 32.0% | 36.5% | 26.8% | 31.6% | 36.0% | | L-trees (%) | 100.0% | 100.0% | | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| | 4th thinning (yrs) | | 44 | | | 45 | 48 | 44 | | | | Intensity (%) | | 29.7% | | | 41.4% | 50.3% | 32.7% | | | | S-trees (%) | | 0.0% | | | 40.0% | 40.0% | 52.0% | | | | M-trees (%) | | 28.0% | | | 38.0% | 40.0% | 23.0% | | | | L-trees (%) | | 100.0% | | | 100.0% | 100.0% | 100.0% | | |
| | 5th thinning (yrs) | | | | | 50 | | | | | | Intensity (%) | | | | | 41.2% | | | | | | S-trees (%) | | | | | 32.0% | | | | | | M-trees (%) | | | | | 43.5% | | | | | | L-trees (%) | | | | | 100.0% | | | | |
| | Rotation (yrs) | 53 | 54 | 50 | 58 | 57 | 58 | 51 | 47 | 42 | | Ro.dg (cm) | 16.8 | 16.2 | 21.3 | 20.7 | 15.9 | 16.8 | 17.3 | 18.2 | 17.1 | | M.A.I. (m3/year) | 7.8 | 7.2 | 9.8 | 8.2 | 6.3 | 5.8 | 6.9 | 9.1 | 9.1 | | Bare land value ($) | 11989.5 | 10748.4 | 15380.9 | 11417.2 | 9236.6 | 10740.8 | 12999.1 | 16476.8 | 16844.4 |
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