摘要
对福建省永安国有林场巨桉14个自由授粉子代测定林进行树高、胸径、材积生长性状、耐寒指数、干形指数及其遗传变异分析,结果表明:参试巨桉家系在树高、胸径、材积生长性状和干形指数的差异均达到极显著或显著水平,这些差异主要受到家系本身遗传力控制,家系遗传力分别为0.7133、0.6246、0.5946、0.6389;耐寒指数差异未达到显著水平。以7a生单株材积、干形指数和4a生耐寒指数为选择指标,综合筛选出速生、耐寒、干形良好的优良家系3个、单株8个,优良家系平均树高、胸径和单株材积分别为16.3m、18.9cm、0.23977m3,比对照柳桉的遗传增益分别高9.52%、16.39%、30.64%;优良单株平均树高、胸径和材积分别为18.6m、24.5cm、0.41930m3,比参试巨桉平均值增益分别高21.23%、45.70%、144.68%,而且耐寒力强、树干比较通直。
Data on tree height, DBH, volume, cold-resistance index and stem form index of 14 open-pollinated progeny of Eucalyptus grandis growing at Yong'an National Forest Farm was analysed to examine genetic variation. The results showed that there were significant differences among progeny for tree height, DBH, volume and stem form index. These differences were mainly controlled by the genetic power of the family itself, with the estimates of these parameters being 0.713 3, 0.624 6, 0.594 6, and 0.638 9 respectively. There were no significant differences among progeny for the trait of cold-resistance index. Using single stem volume and stem form index (at 7-year-old) and cold-resistance index (at 4-years-old) in a selection index, 3 superior families were selected and these averaged 16.3 m in height (average genetic gain, 9.5%), 18.9 cm in DBH (average genetic gain, 16.4%) and 0.239 77 m3 of single stem volume (average genetic gain, 30.6%). Meanwhile, 8 selected, superior progeny of E. saligna had an average height of 18.6 m (average genetic gain, 21.23%), DBH of 24.5 cm (average genetic gain, 45.70%) and single stem volume of 0.419 30 m3 (average genetic gain, 144.68%) compared with E. grandis. These selected, superior progenies also had high cold-resistance index values and straighter stem form than average.
作者
黄秀美
黄德龙
邓鸿荣
陈宇
张国良
张超
刘晓坤
李蹊
HUANG Xiumei;HUANG Delong;DENG Hongrong;CHEN Yu;ZHANG Guoliang;ZHANG Chao;LIU Xiaokuan;LI Xi(State-owned Forest Farm of Yong'an,Yong'an 366000,Fujian,China)
出处
《桉树科技》
2019年第2期27-31,共5页
Eucalypt Science & Technology
基金
福建省林木种苗科技攻关项目三期“桉树良种选育与扩繁应用”子课题3“桉树种子园集约经营与杂交育种”
关键词
巨桉
家系
生长性状
耐寒指数
干形指数
遗传变异
Eucalyptus grandis
family
growth character
cold-resistance index
stem form index
genetic variation
