杉木不同无性系间生长性状差异性研究

摘要

通过对12年生杉木无性系试验林生长性状进行比较分析,探讨不同无性系生长性状表现的差异性。研究结果表明,除了第1组的树高和第3组的胸径外,其余的无性系间的树高、胸径和材积有显著或极显著的差异。广义遗传力变化范围：树高为0.389～0.771,胸径为0.169～0.703,材积为0.377～0.674,试验中无性系的胸径、树高和材积3个性状多具中等以上的广义遗传力,其变异主要受遗传控制。按选择强度估算,优良无性系累积的材积平均遗传增益达到了40%以上,最优无性系累积的材积平均遗传增益达到55%以上。无性系年轮宽度自髓心向外总体上呈逐年波动下降的趋势,但不同无性系的变化趋势还是有较大的差异。%Growth traits of 12 years old Chinese fir clones test was systematically analysed in the papers.The results were as followes,there were significant or very significant difference among clones in growth traits such as height,DBH and stem volume,except for the height of the first group and the DBH of the third group.The range of generalized heritability was 0.389～0.771,0.169～0.703 and 0.377～0.674 for height,DBH and stem volume respectively.By Selection intensity,the avarage stem volume genetics gain of excellent clones was up to 40%,the avarage stem volume genetics gain of the best excellent clones was up to 55%.The tree ring width of the clones was less and less from boxed-heart to the outer,but the variation trend of different clones was different relatively.