【摘要】 对 10年生和 7年生的两块杉木无性系试验林历年生长资料进行分析研究 ,得出结果 :从第2年起无性系高、径生长量的 F值、方差分量、重复力明显增大 ,并开始趋于稳定 ,无性系重复力较高 ,介于 0 .6 5～ 0 .90之间居多。从 3～ 4年生起 ,各年龄树高、胸径与近期对应性状的相关系数 ,以及与近期材积的相关系数增大 ,至趋于稳定。3～ 4年生后各年龄树高、胸径相关信息量亦表现出与相关系数同样的趋势。遗传相关系数大于秩次、表型、环境相关系数 ,表明年龄间生长的相关主要受遗传控制 ,无性系早期选择是有效的。早期选择最佳年龄 ,随主伐年龄的不同而有所差异 ,但介于 3～ 4 a之间。选择效率 D早 - V晚 高于 H早 - V晚 ,前者出现最大选择效率的年龄早于或等于后者 ,所以选择指标倾向于胸径。更多还原

【Abstract】 The growth of 2 clonal plantation (7 and 10 years old) were measured and analyzed. The results showed that the F values of height and diameter increment, the component of variance and repeatability increased significantly and tended to be stabilized in the second year after planting. The repeatability of clone was between 0.65 and 0.90. From the third year on, both the correlation coefficient of height, DBH and the lately corresponding character and the correlation coefficient of height DBH and lately volume became higher and tended to be stabilized. The genetic correlation coefficient is larger than the coefficient of order, phenotype and environment. This showed that the growth correlation coefficient is mainly controlled by heredity, and early selection is effective. The best age of early selection is at 3rd and 4th year. The selective efficiency of early D late V is higher than that of early H late V, and the age of the former which has the biggest selective efficiency emerges earlier than that of the later. So the DBH is an efficient selective index.更多还原