毛白杨优树无性系相关选择研究

StudyonCorrelateSelectionfromPl us Clones of Populus tomentosa

从全国选出的毛白杨优树中选择树龄５０年生以上的老树５５株，采用根繁获得的３年生无性系作为研究材料。通过方差分析估算了个体的重复力并分析了性状的稳定性；通过相关分析，特别是相关遗传力的通径分析，找出了影响苗木材积生长的主要性状，进而获得了优良基因型的表型标志。叶干重大、叶片窄而长、叶缘锯齿大而疏、叶柄较长、枝角适中（４５°左右）、枝数较多是毛白杨速生的主要特征。枝角和叶基用较大是毛白杨木纤维长度较长的标志之一。

plus clones,whichwere reselected from the plus trees in the light of morethan 50- year- old ortets and propagated by root sucker for 3- year- old rejuvenative clones,were used in this study: which mainly deals with the base genetic parameters and path analy-sis of the correlated heritability among 16 traits. The results show that the phenotype of su-perior genotype of Populus tomentosa are formed by big leaf- dry- weight,narrow and long leafform ,large and sparse leaf serrate ,long petiole and many branches. Some signs of longwood fibre length of P. tomentosa are big branch angle and leaf base angle.