巨桉无性系生长早期选择

对26个巨桉无性系人工林生长性状的调查分析表明：胸径、材积在无性系间呈极显著差异,相关性分析结果表明胸径、树高、材积三者间存在极显著的正相关关系。变异系数最大的是材积,达到78.82%,其次为树高和胸径,分别为52.23%、23.13%。胸径、树高、材积的重复力分别为0.5744、0.5469、0.3453。利用综合评定方法评选出5个优良的巨桉无性系,分别为20、18、25、9和5号。5个优良无性系胸径、树高、材积的遗传增益分别为11.60%、11.09%和2.05%。

Early Growth Selections of#$NBSclones#$NBSof Eucalyptus grandis

The investigation and analysis of Eucalyptus grandis 26 clones plantation showed that the DBH and volume were highly significant differences among clones. The correlation analysisSresults showed thatSthere were significantly positive correlation betweenSDBH,Stree height and volume. The largest coefficient of variationSwasSvolume,Sreached 78.82%,Sfollowed by theStree heightSand DBH, respectively by 52.23% andS23.13%.SThe clone repeatability ofSDBH,Stree height and volume reached 0.5744,S0.5469 andS0.3453. Compared comprehensively, selected out 5 superior clones of Eucalyptus grandis which were 20,S18,S25,S9 andS5. The genetic gain of 5 superior clones DBH,Stree height and volume were11.60%,S11.09% andS2.05%.