论文部分内容阅读
对广东省 16块 6～ 10年生的杉木无性系试验林生长进行分析 ,结果表明 :生长性状方差分析 ,无性系间生长量差异达显著水平以上的试验林占 88.2 % ,各试验林最优无性系与最劣无性系的材积比值介于1.9～ 6 1.9之间 ,差异极显著 ;无性系树高、胸径和材积的重复力分别为 0 .6 5 3,0 .6 5 1和 0 .6 17,属于中上水平 ;遗传变异系数 ,材积 >胸径 >树高。当选择率为 0 .0 5 ,0 .10 ,0 .2 0时 ,材积的遗传增益依次为 4 9.86 % ,4 2 36 % ,33.88% ,现实增益依次为 10 5 .11% ,88.71% ,71.0 9% ,现实增益为遗传增益的两倍。按选择标准选择 ,有 78个无性系入选 ,入选率为 8.1% ,其树高、胸径、单株材积的平均增益分别为 2 5 .16 % ,31.2 6 %和93.90 %。无性系早期 (3～ 5年生 )选择至 6～ 10年生时的选准率为 6 3.5 %。
The results showed that 88.2% of the experimental forests with significant difference in growth between clones were analyzed by variance analysis of growth traits, and the best asexuality of each experimental forest The ratio of the volume to the worst clones was between 1.9 and 6 1.9, the difference was significant. The repeatability of tree height, DBH and volume of clones were 0.665, 0.661 and 0.6 respectively 17, belong to the middle level; genetic coefficient of variation, volume> DBH> tree height. When the selection rate was 0. 05, 0. 10, 0. 2 0, the genetic gain of the volume was 4 9.86%, 4 2 36%, 33.88%, and the actual gain was 105.11%, 88.71% 71.0 9%, the actual gain is twice the genetic gain. According to the selection criteria, 78 clones were selected and the selection rate was 8.1%. The average height gain, DBH and single plant volume gain were 25.16%, 31.26% and 93.90% respectively. In the early stage of clonal selection (from 3 to 5 years old), the selection rate from 6 to 10 years old was 6 3.5%.