CAJ | 학술논문

对广西东门林场3.2年生巨桉第二代育种群主要生长性状进行遗传变异和早期遗传型选择研究表明:家系平均树高、胸径、高径比和单株材积分别为10.1 m 、9.3 cm 、1.1 和 0.0446 m3,且各指标在不同家系水平上存在极显著差异.树高、胸径、高径比和单株材积均受到相对较弱的遗传控制,遗传力分别为 0.31、0.31、0.16 和 0.26,估算的遗传力均在合理范围之内.通过有效的遗传型选择,筛选出优良家系12个,树高、胸径和单株材积的遗传增益分别为18.9%、19.5%和42.2%;筛选出优良单株300个,树高、胸径和单株材积的遗传增益分别为15.4%、16.7%和36.7%,遗传增益显著.
대엄서동문림장3.2년생거안제이대육충군주요생장성상진행유전변이화조기유전형선택연구표명:가계평균수고、흉경、고경비화단주재적분별위10.1 m 、9.3 cm 、1.1 화 0.0446 m3,차각지표재불동가계수평상존재겁현저차이.수고、흉경、고경비화단주재적균수도상대교약적유전공제,유전력분별위 0.31、0.31、0.16 화 0.26,고산적유전력균재합리범위지내.통과유효적유전형선택,사선출우량가계12개,수고、흉경화단주재적적유전증익분별위18.9%、19.5%화42.2%;사선출우량단주300개,수고、 흉경화단주재적적유전증익분별위15.4%、16.7%화36.7%,유전증익현저.
A study on genetic variation and early genetic selection was carried out in the second generation breeding population of Eucalyptus grandis at the age of 3 .2 years at Guangxi Dongmen state - owned Forest Farm . The study showed that the differences between families in tree height ( HT) , diameter at breast height (DBH) , ratio of HT to DBH ( H /D) and individual tree volume (VOL) were highly significant . For the best families , mean HT reached 10 .1 m , DBH 9 .3 cm , H /D 1 .1 and VOL 0 .0446 m 3 . Growth traits were found to be under low genetic control with individual tree heritability ( h i2) for HT being 0 .31 , for DBH 0 .31 , for H/ D 0 .16 and for VOL 0 .26 . A total of 12 superior families were selected , with the estimated genetic gain reaching 18 .9% for HT , 19 .5% for DBH and 42 .2% for VOL .Three hundred superior individual trees were selected and the estimated genetic gain with these was 15 .4% for HT , 16 .7% for DBH and 36 .7% for VOL .