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基于J L .Harper的构件理论 ,对 1- 2 0a的人工马尾松林苗木的分枝率动态进行了研究 .结果表明 :马尾松树冠上部的分枝率在 1- 12a阶段为逐级上升 ,到 12a时达到最高值 6 2± 1 8974;在 12 - 2 0a之间马尾松的树冠分枝率维持在一个相对较高的水平 ;在树冠的下部 ,分枝率在 11a时达到最大 ,为 2 9± 1 370 3,之后树冠下层分枝率呈逐级下降的趋势 ;马尾松树冠顶层对下层分枝率的抑制作用非常明显 .
Based on the component theory of JL .Harper, the rate of branching rate of 1-20a artificial Pinus massoniana seedlings was studied. The results showed that the branching rate of the upper portion of Pinus massoniana increased gradually from 1 to 12a, The highest value of 6 2 ± 1 8974 was reached. The crown branching rate of Pinus massoniana remained at a relatively high level between 12 and 20 years. In the lower part of the canopy, the branching rate reached the maximum at 11 a ± 1 3703, and then the rate of branching under the canopy decreased gradually. The inhibitory effect of the top of the canopy crown on the rate of branching was obvious.