Forest Value and Optimal Rotations in Continuous Cover Forestry
Forest Value and Optimal Rotations in Continuous Cover Forestry
复制标题
连续覆盖林业的森林价值和最佳轮作
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
B. Thorsen
中科院分区：
文献类型：
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作者：
J. Jacobsen;F. Jensen;B. Thorsen
福斯特曼森林轮作模型是经济学中一个著名的贡献。该模型提供了一个森林价值的表达，并允许解决最佳轮伐期问题有效的万年林分。然而，连续森林覆盖的森林管理系统意味着不均匀的年龄动态，虽然一些数值研究分析了特定的连续森林覆盖的生态系统，以寻找最佳的管理制度，没有人试图捕捉连续森林覆盖的林业在简单的数学模型的关键动态。在本文中，我们开发了一个简单的，但严格的数学模型的连续覆盖的森林，它严格集中在面积使用动态，这样一个年龄不等的森林必须在平衡。这意味着明确考虑到地区重新分配和按所占地区加权每个年龄组的生产力。我们给出了模型的无限制版本和区域限制版本的结果。我们发现，土地价值是明确的高连续覆盖森林模型相比，同龄模型。在面积限制条件下，连续覆盖林模型的最优轮伐期明显低于面积限制的Faustmann解，而面积不受限制的模型的最优轮伐期结果是模糊的。
The Faustmann forest rotation model is a celebrated contribution in economics. The model provides a forest value expression and allows a solution to the optimal rotation problem valid for perpetual rotations of even-aged forest stands. However, continuous forest cover forest management systems imply uneven-aged dynamics, and while a number of numerical studies have analysed specific continuous cover forest ecosystems in search of optimal management regimes, no one has tried to capture key dynamics of continuous cover forestry in simple mathematical models. In this paper we develop a simple, but rigorous mathematical model of the continuous cover forest, which strictly focuses on the area use dynamics that such an uneven-aged forest must have in equilibrium. This implies explicitly accounting for area reallocation and for weighting the productivity of each age class by the area occupied. We present results for unrestricted as well as area-restricted versions of the models. We find that land values are unambiguously higher in the continuous cover forest models compared with the even-aged models. Under area restrictions, the optimal rotation age in a continuous cover forest model is unambiguously lower than the corresponding area restricted Faustmann solution, while the result for the area unrestricted model is ambiguous.