杉木速生优良无性系选择研究

该文对4个杉木无性系的进一步选择进行了试验研究。结果表明,参试的4个杉木无性系平均树高为10.41m,平均胸径为12.65cm,平均材积为0.075 9m3,林分保存情况良好,且都有较好的生长表现;对4个无性系的树高、胸径和材积这3个生长性状进行方差分析,结果表明,参试的4个无性系在树高、胸径和材积这3个生长性状表现上都存在着显著差异;通过多重比较筛选出了表现最优的2号无性系,其树高、胸径和材积分别为10.75m、15.56cm和0.112 7m3;估算重复力,树高、胸径和材积性状的无性系重复力分别为0.563、0.572和0.667,说明该批杉木无性系的树高、胸径和材积性状受较高的遗传力控制,遗传稳定性很好,对参试无性系进行树高、胸径和材积性状选择,选择的效果会比较好;本试验按25%的入选率来估算遗传增益,其中树高性状预测遗传增益为8.5%,胸径性状预测遗传增益为14.6%,材积性状预测遗传增益为51.2%。

The Selection of Fast-Growing Chinese Fir Clones

This paper studied the further selection of 4 fast-growing Chinese Fir clones. For the test of 4 Chinese Fir clones,the average tree height is 10.41m,the average DBH is 12.65cm,the average volume is 0.075 9m3 and have good growth performance;the analysis of variance against the tree height,DBH and vol-ume of four clones showed that on three growth traits of tree height,DBH and volume there are significant differences;through via multiple comparisons the No. 2 clones were screened the the best performance, whose tree height,DBH and the volume were 10.75m,15.56cm and 0.112 7m3;the heritability of tree height,DBH and volume are 0.563,0.572 and 0.667 by estimating repeatability,indicating that the height, DBH and volume traits were controlled by high heritability and genetic stability is very good,clones were tested by height,DBH and volume trait selection,the effect would be better;this experiment was selected by 25 percent of the estimated rate of genetic gain,including genetic gain is 8.5% by the tree height esti-mating;genetic gain is 14.6% by DBH estimating;genetic gain is 51.2% by the volume estimating.