Abstract: The growth of height and breast-diameter of forest stands of Magnolia officinalis at slop-bottom, slop-middle and slop-top were investigated by large sample. The results indicated that the distribution of height growth and breast-diameter growth at slop-bottom, slop-middle and slop-top were 4.3-14.1 m, 4.0-15.3 m, 4.3-14.5 m and 5.0-21.5 cm, 5.0-19.6 cm, 5.1-18.2 cm respectively. The growth types of height and breast-diameter of M. officinalis at different slop-position were classified by the standard deviation classification method. The results showed that the distribution of diversity growth types at different slop-position was consistent, and the colony weight of growth types with the average value ± 1σ was about 86%. The average values of growth of height and breast-diameter were different because of different site conditions of slop-position. The growth difference was observed from genetic diversity and adaption growth of M. officinalis, which would provide reference for excellent individual selection and provenance improvement.

Key words: Magnolia officinalis, growth characteristic, genetic diversity, adaptability growth, normal distribution standard deviation classification

摘要： 应用大样本调查法对下、中、上坡的厚朴林分高与胸径生长进行调查。结果表明，下、中、上坡的厚朴高生长分别分布于4.3～14.1 m、4.0～15.3 m、4.3～14.5 m，胸径生长分布分别是5.0～21.5 cm、5.0～19.6 cm、5.1～18.2 cm。应用正态分布标准差分类法，对下、中、上坡林分个体高与胸径生长进行分类，表明不同坡位多样性生长类型分布基本一致，平均值与相邻1σ区间生长类型占群体权重的86%。受不同坡位立地条件影响，林分高与胸径生长平均值存在差异，表现为下坡＞中坡＞上坡。由遗传多样性与生长性状适应性分析可知，不同生长类型生长差异较大。

关键词: 厚朴, 生长性状, 遗传多样性, 适应性生长, 正态分布标准差分类法