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在对21个2年生白榆无性系生长量指标测定的基础上,采用方差分析、生长量对比分析、主成分分析法进行数据处理,并对各无性系生长量进行了比较。研究结果证明无性系间各生长指标均存在显著差异,证明其各自不同的生理生态特性;主成分分析得到的前两个主成分共可解释89.24%的数据变异,较好地代表了胸径、树高、冠高值及冠幅等变量,基于此将21个白榆无性系分为4大类,并对分类依据与应用状况进行系统分析探讨。本研究确定了各无性系的生长特性,并为不同幼树生长量评价体系提供了新的方法。
Based on the determination of growth index of clones of 21-year-old P. elmii, variance analysis, comparative analysis of growth quantity and principal component analysis were used for data processing, and the growth of clones was compared. The results showed that there were significant differences among the growth indexes of clones and their different physiological and ecological characteristics were proved. The first two principal components of the principal component analysis explained a total of 89.24% of the data variation, which better represented the DBH, High crown, high crown and other variables. Based on this, the 21 elm elm clones were divided into four categories, and the classification and application status were systematically analyzed and discussed. This study determined the growth characteristics of clones and provided a new method for evaluating the growth of different saplings.