【摘要】 [目的]评价云冷杉针阔混交林不同径级层的合理经营密度范围。[方法]以长白山云冷杉针阔混交林为研究对象,利用林分平均胸径和树冠面积建立的最大密度模型和半峰宽原理,求得大、中、小不同径级林分的合理经营密度。[结果]（1）树冠面积方程方面,云杉、冷杉、红松以二次函数为主,阔叶树种组以线性方程为主,模型的有效区间胸径应在[5, 70]之间;（2）指数函数对于拟合平均胸径与不同径级层最大密度关系较好,但决定系数R²仅在0.5～0.6之间（P<0.05）;（3）小、中、大径级层合理经营密度范围分别为0.403N_max～1.619N_max、0.523N_max～1.754N_max、 0.478N_max～1.307N_max。[结论]合理经营密度株数配比在6∶3∶1、5∶3∶2、5∶4∶1等比例之间变化,且经营指数的频数分布符合正态分布。更多还原

【Abstract】 [Objective] Present study was proposed to establish optimal stand-density models for spruce-fir forest management. [Methods] Stand-density models were developed by calculating crown-area and mean diameter at breast height（DBH） of spruce-fir mixed forest coupled with peak width at half height of forests to evaluate the range of optimal density of different diameter class layers in Changbai Mountain. [Results] The results were shown that:（1） quadratic equation could be employed to determine the crown-area function of Abies nephoriepis, Picea jezoensis, and Pinus Koraiensis, while deciduous species were evaluated accurately with linear equation;（2） exponential equation was more fitting for the relationships between various diameter class layers and mean DBH, however, the range of determination coefficient was only 0.5～0.6 with significance index less than 0.05;（3） the ranges of optimal stand-density of small, medium, and large diameter class layers were determined as 0.403N_max～1.619N_max, 0.523N_max～1.754N_max, and 0.478N_max～1.307N_max, while the proportion of numbers of trees were 6∶3∶1, 5∶3∶2, 5∶4∶1, respectively. [Conclusion] Frequency distribution of management indexes of spruce-fir forest conformed to normal distribution.更多还原