By analyzing the seedling with 5,9 and 13 months Erythrophleum fordii sown in February,June and October of 2015,the results showed that the seedling growth differentiation increased between individuals,and the standard deviation,coefficient of variability and range of height and ground diameter all tended to be increasing with the seedling age increasing.With increase of the seedling age,its distribution rang increased, and the frequency curve of distribution become a lower intensity and multi-peak shape from a steep single-peak shape.The mean height ,ground diameter and crown of 13 months old seedling were 21.6 cm,0.45 cm and 16.7 cm respectively,with their variability coefficient of 34.95%,26.67% and 37.25% respectively,and their differentiation rang of 35cm,0.62cm and 30cm respectively.The competition for nutrition and space is very intense among individual seedlings,and necessary measures such as graded seedling or translating larger size container must be taken to ensure the quality of seedling and increasing the percentage of good nursery.%对2015年2月、6月和10月播种的格木苗进行5个月、9个月和13个月苗龄的生长量指标观测与分析,结果表明,随着苗龄的增大,苗木个体间的分化日趋剧烈,格木苗高、地径和冠幅的标准差、变异系数和极差随着苗龄的增加而呈增大的趋势;分布区间从窄到宽,频率分布从较陡峭的单峰山状曲线变为较平缓、多峰值的山状曲线;13个月的平均苗高、地径和冠幅分别为21.6cm、0.45cm和16.7cm,变异系数分别为34.95%、26.67%和37.25%,极差分别达35cm、0.62cm和30cm.苗木对营养空间的争夺非常激烈,个体间的分化极大,因此在继续培育较大规格的格木苗时,需要进行分级育苗或换更大规格的容器,才能提高苗木的出圃率和质量.
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