Analysis of optimal economic management regimes for Picea abies stands using a stage‐structured optimal‐control model
Analysis of optimal economic management regimes for Picea abies stands using a stage‐structured optimal‐control model
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DOI：
10.1080/02827589109382692
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发表时间：
1991
影响因子：
1.8
通讯作者：
B. Solberg;R. Haight
中科院分区：
文献类型：
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作者：
B. Solberg;R. Haight
一个阶段结构模型预测林分生长和产量加上梯度算法，以确定最佳的治疗方案挪威云杉（云杉喀斯特。）种植园。生长模型预测3厘米直径类之间的树木的运动，使用的生长矩阵，包括直径增长的非线性方程。由于采伐处理可以指定树径级，该模型允许确定最佳间伐时间，间伐强度，间伐类型，同时与种植密度和皆伐年龄。优化模型用于确定治疗方案，并没有变薄的经济和生物参数的值范围很广。结果表明，最优经济造林密度对利率、采伐成本、造林成本和立地等级高度敏感。对于给定的经济参数，最优种植密度对间伐次数和间伐强度不敏感。
A stage‐structured model for projecting stand growth and yield is coupled with a gradient‐based algorithm to determine optimal treatment regimes for Norway spruce (Picea abies Karst.) plantations. The growth model forecasts the movement of trees between 3 cm diameter classes using a growth matrix that includes nonlinear equations for diameter growth. Because harvest treatments may be specified by tree diameter class, the model allows the determination of the optimal thinning timing, thinning intensity, and thinning type simultaneously with planting density and clearfelling age. The optimization model is used to determine treatment regimes with and without thinning for a wide range of values for economic and biological parameters. Results show that the optimal economic planting density is highly sensitive to interest rate, logging costs, planting costs and site class. For a given set of economic parameters, the optimal planting density is not sensitive to the number of thinnings performed or the thinning i...