Branch angle is related with the depth into crown(DINC). It increased with the increseament of DINC.
而在树冠的下层时,枝条的着枝角度也较大,但是数量较少。
参考来源 - 落叶松人工林林木动态模型的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
With the increase of branch grades, the average branch Angle decreased.
随着枝级的增加，平均分枝角度反而减少。
With the increase of age, the average branch Angle of different grades is totally increase.
各级分枝的平均分枝角度随树龄的增大而呈现不同的波动趋势，但总体来说略有增加。
This paper states the general study of tree branching structure from the aspects of branch number, branching mode, branch angle and their space configuration status.
从枝条的分枝级数（数量）、分枝模式、分枝率、着枝角度及其空间配置状态等方面，论述了树木分枝结构的研究概况。
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