本文以尾叶桉×巨桉(Eucalyptus urophylla×E .grandis)F1 子代林为材料,研究了主要生长和材质性状的变异规律,并对它们的遗传参数进行了估计。结果表明,尾叶桉×巨桉F1 子代:(1)树高、胸径和绝干材重主要受到父本的遗传控制;(2)木材密度同时受到父本、母本和父母交互作用的不同程度遗传控制;(3)纤维长度和微纤丝角受到很强的母本遗传作用,管孔弦径、木材胞壁率、木纤维比量和1%NaOH抽提物含量受到很强的父本遗传作用,纤维长宽比仅受到一般程度的父本遗传作用,导管比量同时受到父本和母本很强的遗传作用;(4)纤维壁腔比主要是受到环境因素的影响,父本、母本和父母交互对其均无明显的遗传作用。
In order to supply necessary scientific bases and reference for breeding, genetic variation regularities in growth and wood properties of eucalyptus during hybrid breeding process were investigated. Variation and genetic parameters of major growth and wood properties were studied with F1 of E. urophylla×E. grandis as materials. The results are as follows. (1) Tree height, DBH and dry timber yield of F1 are mainly genetically controlled by father trees. (2) Wood basic density is controlled genetically by both father and mother, and their interaction too. (3) Fiber length and microfibril angle are mainly controlled genetically by mother trees; whereas tangential diameter of pores, cell-wall percentage of wood, wood fiber percentage and 1%NaOH extractives are mainly controlled by father trees genetically, and the ratio of fiber length to width too, but to a lesser extent; Percentage of vessel is controlled genetically by both father and mother trees; (4) Phenotypic variation in the ratio of cell wall thickness to fiber lumen diameter is mainly affected by environmental factors, father and mother and their interaction all show no significant genetic control on it.