Importance of considering the growth response after partial harvesting and economic risk of discounted net revenues when optimizing uneven-aged forest management

Importance of considering the growth response after partial harvesting and economic risk of discounted net revenues when optimizing uneven-aged forest management
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优化不均匀林龄森林管理时考虑部分采伐后的生长响应和贴现净收入的经济风险的重要性

DOI:
10.1139/cjfr-2018-0546
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发表时间:
2020
影响因子:
2.2
通讯作者:
Knoke T.
Knoke T.
中科院分区:
农林科学3区
文献类型:
--
作者:
Messerer;Kacprowski;Baumbach;Knoke T.

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由于基于单树的现代优化模型非常复杂,不确定性往往被忽略。在这项研究中,我们提出了一种建模方法,允许部分收获,但仍然足够简单,考虑风险。我们的建模方法研究是否包括木材价格的不确定性影响采伐时间表。该模型认为积极的增长响应密度降低,收获。测试不确定性的影响,我们定义为随机变量的每个收获业务的贴现净收入。我们比较收获调度和不包括不确定性。我们首先模型的增长响应的基础上的部分收获时间表,没有整合木材价格波动的不确定性。结果表明,在不同的时间收获树群是经济上最优的。我们再次运行相同的模型,包括木材价格波动的风险。包含风险导致建议收获时间的差异稍大。由于观察到的差异很小,我们的结论是,这是不太可能的风险所产生的木材价格波动会强烈影响更复杂的森林经济模型的最佳收获时间表的结果。
Because of the very high complexity of modern optimization models based on single trees, uncertainties are often disregarded. In this study, we present a modelling approach that allows partial harvesting but is still simple enough to consider risk. Our modelling approach investigates whether the inclusion of timber price uncertainty influences the harvesting schedule. The model considers positive growth response to the density reduction that follows harvesting. Testing the impact of uncertainty, we define the discounted net revenues of each harvest operation as random variables. We compare harvest scheduling both with and without the inclusion of uncertainty. We first model growth response based on a partial-harvest schedule, without integrating uncertainty from timber price fluctuations. The results show that harvesting tree cohorts at different times is financially optimal. We run the same model again, including the risk of timber price fluctuations. The inclusion of risk leads to slightly greater differences in recommended harvest timings. Because of the small difference observed, we conclude that it is unlikely that risk arising from fluctuating timber prices would strongly affect the results for more complex forest economic models concerning the optimal harvest schedules.
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