| 落叶松人工林整枝研究 |
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| 引用本文： | 李焱龙,李凤日,贾炜玮.落叶松人工林整枝研究[J].森林工程,2011,27(2):1-4,68. |
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| 作者姓名： | 李焱龙 李凤日 贾炜玮 |
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| 作者单位： | 东北林业大学林学院,哈尔滨,150040 |
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| 基金项目： | 林业公益性行业科研专项经费项目，中央高校基本科研业务经费专项资金项目 |
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| 摘 要： | 根据落叶松人工林不同林龄的10块样地50棵树的节子数据和19块样地95棵树的圆盘数据,建立树高曲线模型、有效冠高的预估模型、林龄与死枝高度的曲线模型,各模型的判定系数均大于0.8,检验精度均大于95%。根据节子高度中的最低节子高度的平均值确定落叶松人工林的整枝起始高度（h1）,用林龄与死枝高度的曲线模型计算该高度上的枝条死亡的时间（t1）为起始整枝时间,t1=14 a。整枝的间隔时间随着林龄的增加先增大,当林龄达在40 a时开始减小。整枝强度也是随林龄的增加先增大,当林龄达到40 a时开始下降,说明林龄在35~40 a是该落叶松人工林生长最旺盛的时期,在这段时期可以考虑该落叶松人工林的主伐问题。当林龄达到47 a后,整枝强度降到1m以下。
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| 关 键 词： | 落叶松人工林 节子 有效冠高 整枝 |
Research on Larch Plantation Pruning |
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| Li Yanlong,Li Fengri,Jia Weiwei.Research on Larch Plantation Pruning[J].Forest Engineering,2011,27(2):1-4,68. |
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| Authors: | Li Yanlong Li Fengri Jia Weiwei |
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| Institution: | (College of Forestry,Northeast Forestry University,Harbin 150040) |
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| Abstract: | Based on the investigation of larch（Larix gmelinii） plantation with different ages,including knots of 50 sample trees in 10 plots and disks of 95 sample trees in 19 plots,models of tree height,effective crown height and relation between dead branch＇s height with age were established in this paper.Results show that the determination coefficient of each model is above 0.8,and test accuracy is higher than 95%.The beginning height of pruning（h1） for larch plantation is determined by the average of the minimum height of knots.Then at the height of h1,dead time（t1）of the branch is calculated by the model simulating the relationship between age and dead branch＇s height,as the beginning time of pruning,whose value is 14.With the increase of forest age,the pruning interval increases first,and then decreases when stand age is over 40 years.And so does the pruning strength.It shows that between the stand ages of 35 and 40 years,the larch plantation is at its most vigorous period.During this period,final felling can be taken into a consideration.When the stand age is over 47 years,the pruning strength would fall below 1 meter. |
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| Keywords: | Larch plantation knot effective crown height pruning |
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