采用大样本调查方法,以预选优株为调查中心,分别连续调查优株所在样地内5年生钟萼木幼树个体树高、地径的生长性状,应用数理统计进行归类分析。结果表明,多年生幼树群体的树高、地径生长表型分化遵循正态分布,利用“t”检验选择法确定优株筛选的选择标准,应用所确定的选择标准筛选速生优株,共筛选优良单株2株,5年生优株与优株所在群体比较,树高和地径分别增长115.8%、82.9%和251.9%、103.7%。 A large sample survey method was used to investigate the growth traits of tree height and diameter of 5-year-old calyx cork trees in the sample plot where the superior plants were located, using the pre-selected superior strains as the investigation center. The classification was analyzed by using mathematical statistics. The results showed that the tree height and diameter growth phenotypes of perennial young tree populations followed the normal distribution, and the selection criteria of elite strains were determined by the “t ” test selection method. Based on the selected selection criteria, A total of 2 excellent single plants were screened, and the tree height and diameter were increased by 115.8%, 82.9% and 251.9% and 103.7%, respectively, compared with those of the superior plants.