华北落叶松优树半同胞家系的子代测定

Half-sib Progeny Test of Larix principis-rupprechtii Plus tree

选育华北落叶松2代优树,为建立高世代种子园提供材料,测定了河北省围场县的138个华北落叶松半同胞家系的34年生子代林的树高和胸径,并用平均试验形数法计算其立木材积。结果表明,华北落叶松半同胞家系之间存在显著差异,具有较高的选育潜力。半同胞家系的树高、胸径和材积遗传力分别为0.368、0.447和0.429,30%入选率下以材积为指标选择出了子代生长表现优良的41个家系,遗传增益树高、胸径和材积分别为2.79%、6.99%和15.00%。

Height and diameter at breast height and volume(with average experimental form-factor method)of 138 trees of half-sib progeny of north China larch(Larix principis-rupprechtii)occurring in Weichang County,Hebei Province were measured and calculated to select superior families and trees for advanced generation seed orchard.The results showed that there were significant differences among the half siblings of the larch,which indicated that the variation among the families was rich and had high potential in selective breeding.The heritability of tree height,diameter at breast height and volume were 0.368,0.447,and0.429,respectively.Under the selection rate of 30%,41 superior families by volume were selected.Genetic gain of the superior families were 2.79%for height,6.99%for diameter at breast height,15.00%for volume.