A new approach to the development of management instructions for tree plantations

A new approach to the development of management instructions for tree plantations
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制定人工林管理指令的新方法

DOI:
10.1093/forestry/cpy048
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发表时间:
2019-04
期刊:
影响因子:
2.8
通讯作者:
Li Fengri
Li Fengri
中科院分区:
农林科学2区
文献类型:
--
作者:
Jin Xingji;Pukkala Timo;Li Fengri

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人工林的管理需要关于间伐的数量、时间、强度和类型以及轮伐期长短的信息。经济上最优的种植园管理取决于贴现率和立地肥力。本研究提出了一种新的方法来制定管理指令的树木种植园,同时为所有的折扣率和网站类。将该方法应用于落叶松(Larix olgensis A.亨利)在中国东北的种植园。优化了间伐断面积、间伐强度和轮伐直径的指令,而不是优化林分个体的管理。说明书由三个方程式组成,第一个方程式表示林分应间伐的断面积,第二个方程式表示最佳间伐强度,第三个方程式表示皆伐时树木的平均直径。采用粒子群优化算法(PSO)同时优化这三个方程模型的系数。粒子群优化算法最大化了29块落叶松样地的经营计划的平均净现值。所获得的指示对应于早期的结果,不同因素对最佳林分管理的影响。根据本研究中开发的指令进行管理,与单独优化每个地块的管理的情况下,几乎同样有利可图。
Management of tree plantations needs information on the number, time, intensity and type of thinnings, and the length of the rotation. Economically optimal plantation management depends on discount rate and site fertility. This study proposed a new approach to developing management instructions for tree plantations, simultaneously for all discount rates and site classes. The method was applied to larch (Larix olgensis A. Henry) plantations in northeast China. Instead of optimizing the management of individual stands, instructions for thinning basal area, thinning intensity and rotation diameter were optimized. The instructions consisted of three equations, the first indicating the basal area at which the stand should be thinned, the second showing the optimal thinning intensity, and the third model indicating the mean diameter of trees at the moment of clear-felling. Particle swarm optimization (PSO) was employed to simultaneously optimize the coefficients of these three equation models. PSO maximized the average net present value of the management schedules of 29 larch sample plots. The obtained instructions corresponded to earlier results on the effects of different factors on optimal stand management. Management based on the instructions developed in this study resulted in almost equally profitable management as in the case where the management of every plot was optimized separately.
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