摘要
本文利用生长比的概念探讨了油松枝的延长生长量随着枝龄和着枝深度而变化的规律。并利用枝解析方法研究了枝的材积生长与枝龄、着枝深度和树木所处的竞争状态间的关系,最后确定出各样木总枝材积的生长及枝、干材积生长的比例。研究结果表明:树冠内枝的年延长生长在树冠顶端第二轮或第三轮枝处达到最大值;而枝材积生长的最大值则在较下部的轮枝上出现,具体位置与树冠的大小和所承受的竞争压力有关;不同样木的枝、干材积生长比例相差很大,孤立木可达1:1,而被压木却只有1:10左右,从中说明树木间的竞争对枝材积生长的影响比对干材积生长的影响更大。
Using the ratio of branch length with tree height (named as 'growth-ratio') the impact of branch age and branching distance from tree top (branching 'depth') on elongation of branches was discussed. Changes in branch volume increment with branch age, branching 'depth' and tree competition index were studied by branch analysis. Total volume increment of branches per tree and the ratio of total volume increment of branches to volume increment of stem were calculated. The results showed that the annual branch elongation was the highest on the second or third whorl from the top in the crown and the highest volume increment of branches was on the lower whorls. For open-grown trees, the ratio of total volume increment of branches to volume increment of stem was about 1:1, and that of suppressed trees, only about 1:10.
