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Calculation of Economic Rotation Period for Even-Aged Stand in Croatia

机译：克罗地亚平均年龄林分经济轮换期的计算

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Background and purpose: Even-aged forests prevail in Croatia’s forestry. Rotation period is based mostly on natural parameters. In practice, rotation period is given by Croatian Rulebook of forest management. Cutting age is determined based on inventory data and many other stand characteristics. Rotation period is a planned time and it always has to be unique for particular tree species, and cutting age is the age of a stand at the moment of the final cut. The aim of the paper is to compare rotation period based on economic parameters and rotation period determined by using forest inventory data. Material and methods: Owing to absence of long term stand calculation data, research object was taken from Forest Management Handbook (1995). Mean annual increment (MAI) and current annual increment (CAI) provided fundamental data for calculations. The research was conducted at one hectare Common Beech (Fagus sylvatica L.) stand. Assortment structure and value of timber was estimated by the present cutting value method calculated by using Croatian forests Ltd. Price list for the year 2008. Labor costs in forest exploitation were also taken into account. Results and conclusion: In order to achieve cost-effective management of common beech stands, it is necessary to adjust current optimal rotation period. Optimal rotation period should be based on management goals as the main factors. So far the most common criterion adopted in Croatian forestry has been the rotation of maximum sustained yield or maximum Mean annual increment. The presented results indicate that common forest management practice should be changed in order to achieve cost-effective management of beech stands in the future.
机译：背景和目的：古老的森林在克罗地亚的林业中盛行。轮换期主要基于自然参数。实际上，轮换期由克罗地亚森林管理规则手册给出。切割年龄是根据库存数据和许多其他机架特征确定的。轮伐期是计划的时间，对于特定的树种而言，轮伐期始终必须是唯一的，而伐木年龄是指最终伐木时的林分年龄。本文的目的是比较基于经济参数的轮伐期和使用森林清单数据确定的轮伐期。材料和方法：由于缺乏长期林分计算数据，研究对象取自《森林管理手册》（1995年）。平均年增量（MAI）和当前年增量（CAI）为计算提供了基本数据。该研究是在1公顷的普通榉木（Fagus sylvatica L.）展台上进行的。木材的分类结构和价值通过使用克罗地亚森林有限公司（Croatian forests Ltd.）计算的当前采伐价值法估算。2008年价格表。还考虑了森林开发中的人工成本。结果与结论：为了实现普通山毛榉林的高性价比管理，有必要调整当前的最佳旋转周期。最佳轮换期应以管理目标为主要因素。到目前为止，克罗地亚林业采用的最普遍标准是最大持续产量或最大平均年增量的轮换。提出的结果表明，应改变常见的森林管理做法，以便将来实现山毛榉林的成本效益管理。

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