摘要
根据长白落叶松人工林单木生长模型,运用Hooke&Jeeves求解算法确定了林分初植密度为3 300株/hm^2时,以不同立地的林分木材价值和碳储量同时最大为经营目标的最优经营模式,并分析经营目标对优化结果的影响以及经济参数的敏感性。结果表明:林分初植密度为3 300株/hm^2时,各立地条件下林分最优间伐次数为3次。地位指数16、18、20 m的林分多目标优化的轮伐期分别为50、46、43 a;木材平均产量分别为7.897、9.429、11.070 m^3·hm^(-2)·a^(-1)。随着碳储量权重的增大,碳储量对经营目标最为敏感。在相同立地条件下,随着贴现率的增大,轮伐期延长,净收入、净现值和碳储量减少,木材产量增加。对于相同贴现率,立地质量越好,木材产量、净现值、年均净收入和碳储量越大,轮伐期越短。年均净收入和净现值受木材价格的影响较大,且与木材价格呈现正相关关系,而木材产量和碳储量受木材价格的影响不大。碳储量、净现值、木材产量和年均净收入对营林成本不敏感,木材价格提高或者营林成本降低均能缩短轮伐期。
With the individual growth model of Larix olgensis plantation, the optimal management mode with maximum net present value of wood production and carbon stock schedule was determined for different site index when the stand planting density was 3 300 tree/hm ^2 by using the Hooke ＆ Jeeves algorithm. The effect of management objective on optimal management and sensitivity of results to economic parameters were analyzed. Three thinnings were suitable for larch plantations when the initial stand density was 3 300 tree/hm^2. The optimal rotation period was 50, 46 and 43 a and mean annual wood production was 7.897, 9.429, 11.070 m ^3·ha ^-1 for site indices 16, 18, 20 m, respectively. As the weight of carbon stocks was increased, the carbon stocks were the most sensitive for management objective. With the same site conditions, as the discount rate increased, the rotation period would be extended, and net income, net present value and carbon stock would decrease, while timber output would increase. For the same discount rate, as the better site quality it have, the timber yield, net present value, annual net income and carbon reserves will increase, but the rotation period will shorten. The annual average net income and the net present value are greatly affected by the timber price and positively related to the timber price, while the wood production and carbon storage are not affected by the timber price. Carbon stocks, net present value, timber production, and average annual net income are not sensitive to the silviculture cost. Increasing the timber price or reducing the silviculture cost can shorten the rotation period.
作者
彭娓
李凤日
金星姬
李朝晖
Peng Wei;Li Fengri;Jin Xingji;Li Zhaohui(Northeast Forestry University,Harbin 150040,P.R.China;Heilongjiang Provincial Academy of Forestry and Environmental Scienc)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2018年第7期1-6,共6页
Journal of Northeast Forestry University
基金
国家重点研发计划课题(2017YFD0600402)
关键词
长白落叶松
木材价值
碳储量
多目标优化
森林经营模式
Larix olgensis plantation
Net present value of wood product
Carbon stock
Multi-objective optimization
Forest management models
