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以４年生刚果１２号桉无性系测定林实测的生长数据为基础，分析了树高、胸径和材积生长量的早晚期相关（包括秩次相关、表型相关和遗传相关），并根据表型相关系数建立了早期选择的回归方程，同时也估算早期选择的年效率和确定出最佳选择年龄。结果表明，生长性状早晚期相关基本上达到显著或极显著水平，说明早期选择是可行的；生长性状最佳选择年龄为１．５～４．５ａ，约为１／５～１／３轮伐期，此时其年选择效率均大于１，说明早期选择是有效的。
Based on the measured growth data of 4-year-old Congo 12 clones, the early and late correlations (including rank correlation, phenotypic correlation and genetic correlation) of tree height, DBH and volume growth were analyzed. According to phenotype The correlation coefficient establishes the regression equation of the earlier choice, as well as the annual efficiency of the early selection and the determination of the best choice age. The results showed that the correlation of early and late growth traits basically reached significant or extremely significant level, indicating that early selection was feasible. The optimal selection of growth traits was from 1.5 to 4.5 years, about 1/5 ~ 1/3 rounds Period, the annual selection efficiency is greater than 1, indicating that the early selection is effective.