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日本落叶松的树冠形态与生长之间存在着关联性。通过灰色关联分析，得到分枝角度与胸径、树高的灰色关联度较大，提出了分枝角度可作为日本落叶松类型划分的指标之一。
There is a correlation between crown morphology and growth of Japanese larch. Through the gray relational analysis, the branch angle and the diameter at breast height were obtained, and the gray relational degree of the tree height was large. The branch angle was proposed as one of the indexes for the classification of Japanese larch.