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对广东省乐昌市龙山林场杉木基因库中272个10年生杉木无性系的树高、胸径、树皮厚、单株材积4个生长性状,心材比、木材基本密度等2个材质性状进行测定分析。结果表明:272个杉木无性系间存在丰富的表型变异,表型变异系数均>10%;以单株材积变异系数最大,为69.04%,遗传变异系数为73.97%,变异幅度0.003 8~0.479 1 m3。6个重要性状在无性系间均表现为极显著差异,表明所测各性状均受较强的遗传控制。遗传相关系数和表型相关系数均是材积最高;密度遗传变异系数最低,为13.03%,重复力属中上水平(0.684 3),仅心材比的重复力低于0.5。在10%、20%、30%和50%不同入选率下计算,所测性状遗传增益值均随入选比例的增大而降低。树高、胸径、树皮厚、材积4个生长性状间呈显著正相关,且均与木材基本密度呈极显著负相关。
The tree height, diameter at breast height, bark thickness, 4 growth traits per plant, heartwood ratio and basic wood density of 272 Chinese fir clones in the Chinese fir gene pool of Longshan Forest Farm in Longchang Forest Farm of Guangdong Province were measured analysis. The results showed that there were abundant phenotypic variation in 272 Chinese fir clones with the coefficient of phenotypic variation> 10%. The coefficient of variation of the single plant was 69.04%, the coefficient of variation was 73.97% and the variation range was 0.003 8 ~ 0.479 There were extremely significant differences in the 6 important traits of 1 m3 between clones, indicating that all tested traits were strongly controlled by the gene. The genetic correlation coefficient and the phenotypic correlation coefficient were the highest volume. The lowest coefficient of variation of density was 13.03%, and the repeatability was middle level (0.684 3). The repeatability of heartwood ratio was less than 0.5. Calculated under 10%, 20%, 30% and 50% different selection rates, the genetic gain of the tested traits decreased with the increase of the selected proportion. Tree height, diameter at breast height, bark thickness, volume of four growth traits were significantly positive correlation, and both were extremely significant negative correlation with wood basic density.