选取5种竞争指标,建立人工落叶松林木胸径、树高和冠长与各竞争指标间的相关关系。对比发现,竞争指标CI、RCI、RC1、RC2随胸径的增大呈指数减小。鉴于此,选取5个经验方程进行建模,结果显示,对于胸径和CI、RCI、RC1、RC2间的关系用双曲线和幂函数方程拟合较为适宜。这一研究结果可作为单木生长模型建立的基础,同时,有助于提高人们对竞争指标的认识。 Five competitive indexes were selected to establish the correlation between the DBH, tree height and crown length and the competition indexes. The comparison shows that the competition indexes CI, RCI, RC1 and RC2 decrease exponentially with DBH increase. In view of this, five empirical equations are selected for modeling, and the results show that the relationship between RCI, RC1 and RC2 for DBI and CI is better fitted by hyperbolic and power function equations. The results of this study can be used as a basis for the establishment of a single-tree growth model, and at the same time help to raise awareness of competition indicators.