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首页> 外文期刊>Northern Journal of Applied Forestry >Windthrow after shelterwood cutting in balsam fir stands
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Windthrow after shelterwood cutting in balsam fir stands

机译：苦瓜冷杉砍伐砍伐柴后的风

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摘要

The use of partial cutting in balsam fir stands has been greatly restricted by the fear of windthrow. This applies to shelterwood cutting, for which very little quantitative information on windthrow is available. This study was conducted in 50-yr-old balsam fir stands. The aim of the study was to quantify windthrow losses associated with three patterns of seed cuts. The study consists of five replicates of four treatments: uncut control, uniform shelterwood, group shelterwood, and strip shelterwood. Complete windthrow monitoring was performed at 2, 4, and 6 yr after cutting. The effect of treatment, wind exposure, and stand characteristics was assessed after 6 yr. A simulation with the ForestGales model was conducted to better understand the seed cut pattern effect in identical stands. Results showed that a shelterwood method involving a low intensity seed cut can be applied in relatively sheltered balsam fir stands. Topographic exposure and stand characteristics did not contribute to the amount of windthrow observed. The major factor explaining the amount of windthrow seems to be the presence of adjacent cuts that funneled wind into the plots.
机译：由于担心被风吹，在香脂冷杉林中部分切割的使用受到了极大的限制。这适用于砍伐木料，对于这种木料，关于风掷的定量信息很少。这项研究是在50岁的苦瓜冷杉林中进行的。这项研究的目的是量化与三种切种子方式相关的风掷损失。该研究由四个处理的五个重复样本组成：未切割对照，统一防护林，组防护林和条状防护林。切割后的第2、4和6年进行了完整的抛风监测。 6年后评估治疗效果，风向和林分特性。进行了ForestGales模型的模拟，以更好地了解相同林分中的切种子模式效应。结果表明，在相对庇护的苦瓜冷杉林中可以采用涉及低强度种子砍伐的庇护林方法。地形暴露和林分特征对观察到的风量没有贡献。解释风量的主要因素似乎是相邻割口的存在，这些割口将风汇入地块。

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