作　　者： ; ; ; ; ; (丁彪）; (刘淑梅）;

机构地区： 中国林业科学研究院林业研究所国家林业局林木培育重点实验室

出　　处： 《林业科学研究》 2006年第2期188-191,共4页

摘　　要： 对10个10年生日本落叶松无性系的早材和晚材微纤丝角进行了测定,结果表明:早、晚材微纤丝角无性系间差异极显著,同一年轮内早材微纤丝角大于晚材。日本落叶松微纤丝角的径向变异规律为:在髓心处最大,以后逐渐减小。早、晚材微纤丝角与树木年轮间的变异模式(径向变异)以对数和乘幂式方程拟合效果较好,R2(R为相关系数)均在0.8以上。早、晚材微纤丝角同树高、形率、树皮厚度、主枝粗、枝干比、主枝夹角、主枝长的相关关系不显著,早、晚材微纤丝角同胸径、冠幅的相关关系达到显著水平;早材与晚材的微纤丝角也相关显著。早材和晚材的微纤丝角受中到强度遗传控制,广义遗传力分别为0.767 4、0.804 3。按照20%的选择率,早材和晚材的微纤丝角的遗传增益分别为21.82%和29.75%。 Genetic variations of tracheid microfibril angle of earlywood and latewood of ten 10-year-old Japanese larch clones were investigated. The result revealed that the microfibril angle of earlywood and latewood had a high significant difference among clones. The microfibril angle of earlywood and latewood showed a highly significant difference among different tings. The microfibril angle of earlywood and latewood decreased with the increase of growth ring age. The variation pattern of microfibril angle of earlywood and latewood at DBH from pith to bark was well fitted by logarithm and power equation（R^2 〉0. 8 ）. The broad sense heritability estimates of clones were 0.767 4 and 0.804 3, indicating the microfibril angle of earlywood and latewood was under strong genetic control. The average genetic gains were 21.82% and 29.75% for the microfibril angle of earlywood and latewood if 20% of the best clones was selected.

关 键 词： 日本落叶松 无性系 微纤丝角 遗传参数 选择效率

领　　域： [农业科学] [农业科学]