Scientia Silvae Sinicae ›› 2022, Vol. 58 ›› Issue (4): 62-73.doi: 10.11707/j.1001-7488.20220407
• Research papers • Previous Articles Next Articles
Lin Liu1,Xu Zhang2,Sujun Yu3,Honggang Sun2,*,Jingmin Jiang2,Yuhua Wang1
Received:
2021-05-14
Online:
2022-04-25
Published:
2022-07-20
Contact:
Honggang Sun
CLC Number:
Lin Liu,Xu Zhang,Sujun Yu,Honggang Sun,Jingmin Jiang,Yuhua Wang. Economic Analysis on Optimal Rotation Period of Slash Pine Plantations Used for Timber and Resin—A Case Study in A State-Owned Fengshushan Forestry Farm of Jingdezhen, Jiangxi Province[J]. Scientia Silvae Sinicae, 2022, 58(4): 62-73.
Table 1
Descriptive statistics of slash pine plantations used for timber and timber & resin"
项目Item | 林龄 Stand age/a | 地位指数 Site index | 造林密度 Planting density/(plant·hm-2) | 胸径 DBH/cm | 树高 Height/m | 单位面积活立木株数 Number of living trees per unit area/(plant·hm-2) | 林分蓄积 Stand volume/(m3·hm-2) | 松脂产量 Resin yield/(t·hm-2) | |
用材林 Timber plantation | 最大值Max. | 35 | 18 | 5 000 | 36.6 | 18.6 | 2070 | 260.68 | |
最小值Min. | 2 | 12 | 2 000 | 1.41 | 7.4 | 167 | 12.63 | ||
平均值Mean | 14.4 | 2 787 | 17.9 | 13.9 | 620 | 139.27 | |||
标准误差S.D. | 6.1 | 1 718 | 5.0 | 4.6 | 552 | 106.37 | |||
材脂兼用林 Timber & resin plantation | 最大值Max. | 35 | 18 | 5 000 | 31.6 | 18.3 | 2353 | 158.42 | 3.85 |
最小值Min. | 13 | 12 | 2 500 | 14.0 | 8.0 | 406 | 13.52 | 1.21 | |
平均值Mean | 18.6 | 3 108 | 14.7 | 12.6 | 899 | 93.77 | 2.45 | ||
标准误差S.D. | 3.3 | 1 532 | 4.9 | 3.2 | 442 | 60.27 | 0.41 |
Table 2
Average unit cost and output price of slash pine plantations in Jiangxi Province"
项目Item | 栽培措施 Activity | 材脂兼用林 Timber and resin plantation | 用材林 Timber plantation | ||||
单位成本 Unit cost | 产出价格 Output price | 单位成本 Unit cost | 产出价格 Output price | ||||
种植 Planting | 第1年 1st year | 杂灌清理(含挖穴) Removing the competitive vegetation (including digging holes) /(yuan·hm-2) | 4 500 | 4 500 | |||
1年裸根苗 1-year-old bare root seedling /(yuan·seedling-1) | 0.6 | 0.6 | |||||
开穴回土 Expanding holes & re-earthing/(yuan· hole-1) | 0.26 | 0.26 | |||||
抚育 Tending | 第1年 1st year | 第一次扩穴培土(含杂灌抚育) The first expanding holes & adding soil (including removing the competitive vegetation) /(yuan·hm-2) | 900 | 900 | |||
第2年 2nd year | 两次扩穴一次全刈 Two expanding holes & one mowing /(yuan·hm-2) | 1 800 | 1 800 | ||||
第3年 3rd year | 一次扩穴两次全刈 One expanding holes & two mowings | 1 650 | 1 650 | ||||
间伐 Thinning | 第8年 8th year | 清理间伐材的人工费 Labor fee with cleaning the thinned timber/(yuan·hm-2) | 8 550 | 8 550 | |||
间伐材 Thinned timber /(yuan·m-3) | 400 | 400 | |||||
抚育补助 Financial aid with tending /(yuan·hm-2) | 1 500 | 1 500 | |||||
第15年 15th year | 清理间伐材的人工费 Labor fee with cleaning the thinned timber/(yuan·hm-2) | 4 800 | 4 800 | ||||
间伐材 Thinned timber/(yuan·m-3) | 600 | 600 | |||||
抚育补助 Financial aid with tending/(yuan·m-2) | 1 500 | 1 500 | |||||
采脂 Tapping resin | 第13年到主伐 From 13th year to final felling | 采脂人工费和耗材费 Cost of tapping resin labor and supplies /(yuan·t-1) | 5 000 | 8 000~10 000 | |||
主伐 Final felling | 采伐、集材和造材的人工费Labor fee with felling(yuan·m-3), yarding (yuan·t-1) and bucking(yuan·m-3) | 300、50、30~50 | 50、30~50 30~50 | ||||
木材价格 Timber price /(yuan·m-3) | 700 | 按照径阶大小和市场价 Based on timber diameter grade and timber market price | |||||
管理 Maintenance & protection | 管护人员工资 Wages of rangers/(yuan·hm-2a-1) | 300 | 300 |
Table 3
Optimal rotation and LEVs of slash pine plantations"
折现率 Discount rate (%) | 经营方式 Management patterns | 最优轮伐期 Optimal rotation/a | 林地期望价值 Land expected value/(yuan·hm-2) | 林地机会成本 Opportunity cost of forest/land (yuan·hm-2) | 推迟采伐机会成本 Opportunity cost of timber/deferred harvest (yuan·hm-2) |
2 | 材脂兼用林 Timber and resin plantations | 32 | 337 302.971 | 6 746.059 | 930.311 |
用材林 Timber plantations | >35 | 262 811.554 | 5 256.231 | 5 375.561 | |
5 | 材脂兼用林 Timber and resin plantations | 32 | 91 456.221 | 4 572.811 | 2 325.779 |
用材林 Timber plantations | 26 | 44 913.979 | 2 245.698 | 10 947.570 | |
10 | 材脂兼用林 Timber and resin plantations | 33 | 23 562.130 | 2 356.213 | 4 661.057 |
用材林 Timber plantations | 23 | 3 195.057 | 319.505 | 11 511.791 | |
15 | 材脂兼用林 Timber and resin plantations | 33 | 2 563.928 | 384.589 | 6 991.586 |
用材林 Timber plantations | 22 | -7 109.850 | -1 066.477 | 28 793.375 |
Table 4
Sensitive analysis of LEVs and optimal rotation of slash pine plantations"
折现率 Discount rate(%) | 活立木价格增加20% Standing tree price increased by 20% | 活立木价格下降15% Standing tree price decreased by 15% | |||||||
Tt* | LEVt | Tt+r* | LEVt+r | Tt* | LEVt | Tt+r* | LEVt+r | ||
2 | >35 | 340 747.063 | 33 | 371 152.592 | >35 | 204 359.922 | 33 | 327 389.217 | |
5 | 28 | 65 795.933 | 33 | 99 134.869 | >35 | 36 746.379 | 33 | 85 862.152 | |
10 | 23 | 9 113.910 | 28 | 24 638.343 | 24 | -1 224.677 | 33 | 22 737.312 | |
15 | 21 | -4 823.094 | 25 | 3 027.088 | 22 | -8 662.947 | 33 | 2 372.278 | |
折现率 Discount rate(%) | 松脂价格上升到12 000元·吨-1 Resin price increased to 12 000 yuan·t-1 | 松脂价格下降到8 000元·吨-1 Resin price decreased to 8 000 yuan·t-1 | |||||||
Tt* | LEVt | Tt+r* | LEVt+r | Tt* | LEVt | Tt+r* | LEVt+r | ||
2 | - | - | 33 | 578 804.966 | - | - | 33 | 268 591.610 | |
5 | - | - | 33 | 164 954.543 | - | - | 33 | 74 981.949 | |
10 | - | - | 33 | 48 996.418 | - | - | 33 | 15 084.034 | |
15 | - | - | 33 | 13 491.034 | - | - | 27 | -1 040.065 | |
折现率 Discount rate(%) | 人工成本增加10% Labor cost increased by 10% | 人工成本增加20% Labor cost increased by 20% | |||||||
Tt* | LEVt | Tt+r* | LEVt+r | Tt* | LEVt | Tt+r* | LEVt+r | ||
2 | >35 | 246 651.483 | 33 | 294 823.540 | >35 | 230 677.972 | 33 | 243 696.879 | |
5 | 27 | 42 713.679 | 33 | 90 605.458 | >35 | 39 726.842 | 33 | 66 248.903 | |
10 | 23 | -55.255 | 33 | 17 190.810 | 25 | -3 159.908 | 33 | 10 876.050 | |
15 | 22 | -9 072.482 | 33 | -810.859 | 22 | -11 055.981 | 33 | -4 145.718 |
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