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。

This study was performed by using dead branches and knot size analysis data of 50 sample trees in 10 sample plots for Larix olgensis Hengy plantations with different ages, different stand density and different sites. The data statistical analysis and matrixes and simulating technique are uses for analyzing and studying the distribution of the knot size along the stem. The models of predicting knot size were established. The results indicate: (1) the knot diameter increases with the knot height and reaches limit value at the tree crown base. The knot diameter can be described with Mitscherlich equation. (2) below 40% of the tree, the sound knot length increases along with the height of living locations of the knot, then the trend tends to decrease.(3) the loose knot length increases with the increasing of tree diameter at breast height and decreases with the increasing of knot angle.