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本研究根据131个杉木无性系26a的调查数据试图探讨优良无性系最早选择年龄和营林增产效益。在试验时期,无性系之间H、D_(1.3)的生长差异始终显著存在。当无性系间具有显著差异时,6a时按H>CK_15%、D_(1.3)>CK_110%选择了17个无性系,10a、15a和26a时首先将H>CK_15%、H>CK_110%的无性系排序、再顺位选择17个无性系,并与26a选择的无性系进行比较。凡与26a选择相同的无性系认定为正选无性系。结果发现:6a时正选率47.06%、10a时正选率82.35%、15a时正选率88.24%。因此认为:杉木优良无性系的最早选择年龄是10a。对块状造林优良无性系与CK_2的调查数据统计计算后得出:优良无性系的营林增产效果明显。优良无性系在10a时的产材量是生产种CK_2的1.57倍,15a是生产种CK_2的1.67倍,26a是生产种CK_2的1.81倍。
Based on the survey data of 131 Chinese fir clones 26a, this study attempted to explore the earliest selection age and yield enhancement benefits of elite clones. During the experimental period, the differences in the growth of H, D_ (1.3) between clones always persisted. When there were significant differences among clones, 17 clones were selected by H> CK_15% and D_ (1.3)> CK_110% at 6a, and the clones with H> CK_15% and H> CK_110% Department sequencing, and then re-select the 17 clones, and with 26a clones selected for comparison. All clones with the same selection as 26a were identified as positive clones. The results showed that the positive selection rate was 47.06% at 6a, positive selection rate was 82.35% at 10a, and positive selection rate was 88.24% at 15a. So that: the elite clonal selection of the earliest age is 10a. The statistics of the survey data of clonal afforestation and CK_2 of massive afforestation showed that the yield increase of silviculture with good clones was obvious. The yield of superior clones at the time of 10a was 1.57 times that of CK2, 15.6% of CK2 and 1.81 times of CK_2 of 26a.