桤木优良无性系苗期的初步选择

开展林木优良无性系选择,以获得最大遗传增益和经济效益。本研究针对桤木优良半同胞家系中的优良个体,通过扦插繁育技术建立了476个无性系,观测苗高和地径苗期生长性状,并进行差异显著性分析,利用隶属函数法结合主成分分析赋予各性状权重值,对各无性系进行综合评价。结果显示:无性系间的苗高和地径差异均达到极显著水平(P<0.01)。根据两个性状的隶属函数值的均值,将无性系划分为7个等级,其中3个无性系被确定为1级,这些无性系苗高和地径的均值较整个群体均值分别提高了224.3%和82.3%;被评为2级的无性系有9个,被评为3级的无性系有45个,可作为增加桤木遗传多样性候选对象。

A Preliminary Seedling Selection of Superior Clones of Alnus cremastogyne

The goals of this study were to select superior clones of alder(Alnus cremastogyne),and to achieve maximum genetic gains and economic benefits.A total of 476 alder clones obtained through cuttage were used to study the height and ground diameter and significance analysis of their difference.By the method of membership function in fuzzy mathematics and principal component analysis,aiming to provide the weight value of each character and the comprehensive evaluation of the clones.The results showed that there were significant differences(P<0.01) in each of two traits(height and ground diameter).According to the average of the membership function value,the clones were classified into seven grades.Three clones were identified as grade 1,of which the height and ground diameter were 224.3% and 82.3% higher than average,respectively;while nine clones were classified as grade 2 and 45 clones were classified as grade 3,and these might be used as candidates to increase genetic diversity.