【摘要】 大花序桉(Eucalyptus cloeziana)是生产锯材的潜力树种之一,对其进行了种源/家系早期选择研究,结果表明:2.5年生试验林的平均树高和胸径分别为7.45 m和7.10 cm,且各指标在种源和家系水平上都存在极显著差异;树高、胸径及材积的遗传力随树龄的增加而增大,2.5年生时树高、胸径及材积的遗传力分别为71.1%、75.1%和68.5%;早期选择的家系胸径和材积具有较高的遗传增益,分别达到12.68%和25.26%,树高仅为6.68%,因此家系在早期选择时将更多考虑材积和胸径因子。用指数选择法选出20729等8个种批和C4-139等20个家系为推荐的潜力优良材料。更多还原

【Abstract】 Eucalyptus cloeziana is a potential saw timber species,the study on provenances and families shows that mean HT and mean DBH arrives to 7.45 m and 7.10 cm at 2.5 years old,and there are significant differences between provenances and families for all growth traits.The heritability of HT,DBH and Volume of family are 71.1 %,75.1 % and 68.5%,and also the heritability of HT、DBH and Volume appearing to be the older the bigger.There are also much higher genetic gains for DBH and Volume of the families that arrive to 12.68% and 25.26%,and for HT just is 6.68%.Therefore,DBH and Volume of families will be the main factors in the early selection.8 seedlots and 20 families are selected as recommended potential improved materials by the way of index selection,更多还原