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以不同年龄、不同密度、不同立地条件的落叶松人工林作为研究对象,基于10块标准地中50株样木所获得的死枝和节子大小数据,利用数据统计分析模型和模拟技术,分析并研究了节子大小在树干上的分布规律,并构建了节子大小的预测模型。研究结果表明:1)节子直径随着节子着生高度的增加而持续增加,在树冠基部达到一渐进值,可用Mitscherlich方程对节子直径进行预测;2)在树高约40%处以下的健全节长度随着节子着生位置的增加而逐渐增加,然后再向上有减小的趋势;3)疏松节随着胸径的增大而增大,随着节子着生角度的增大而减小。
Based on the data of dead branches and knots size obtained from 50 sample trees in 10 standard plots, the larch plantations of different ages, densities and site conditions were used to analyze the model and simulation techniques The distribution rule of knot size on the trunk was also studied, and the knot size prediction model was constructed. The results show that: 1) The diameter of knot continuously increases with the increase of knot height, and reaches a gradual value at the base of canopy. The diameter of knot can be predicted by Mitscherlich equation; 2) Under the tree height of about 40% The length of healthy section increased gradually with the increase of the position of knot, and then the upward trend of decrease gradually.3) The loose section increased with the increase of DBH. With the increase of knot angle And reduce.