群众杨改良无性系材性性状遗传分析

对１７个群众杨改良无性木材密度、纤维长度、纤维宽度、纤维长宽比、纤维壁腔比进行分析，结果表明：（１）木材我性间差异显著，２８－７７号无性的木材密度为０．４３２７ｇ／ｃｍ＾３，比对照品种群众杨提高了２３．８％；（２）无性系间和树龄间纤维长度、纤维长宽比差异极显著。树龄间纤维宽度、纤维壁腔比差异极显著。纤维长度树龄的增长逐渐变长；树龄对纤维长度总变异的贡献率达６４．３％，是变异的主要来源。（３）木材密

GENETICAL ANALYSIS ON WOOD PROPERTIES OF THE IMPROVED CLONES OF POPULUS POPULARIS

Wood density, fiber length, fiber width, ratio of fiber length and width, andratio of fiber wall and volume of 18 improved clones of Populus popularis wereanalyzed. The tested clones had a significant difference in wood density. Thewood density of clones No. 28-77 was 0. 432 7 kg/cm3, which was increased by23. 8%, compared with the contrast varieties of P. popularis. There existedextreme difference in length of fiber and ratio of fiber length and width betweenthe clones and between tree ages. The fiber length increased with growing age.The tree age, as main reason for variation of fiber length, had 64. 3% ofcontribution rate. The general genetic abilities of wood density. fiber length, fiberwidth, ratio of fiber length and width. and ratio of fiber wall were 0. 6477,0. 720 6, 0. 489 0, 0. 724 1, and 0. 2 respectively. Wood density, length of fiber andratio of fiber length and width were much determined by genetic effects. Theresults of wood density and shape and the properties of fiber in variablecontribution rate and general genetic ability were just the same as the testedclones have.