主成分分析和投影寻踪法在雷公藤优树选择中的应用

用主成分分析和投影寻踪法对野生雷公藤进行优良单株生长性状选择标准的探讨，结果表明：2种方法均可应用于雷公藤优良单株的选择，其中主成分分析法主要选择指标为盖度、主藤长和地径，而投影寻踪法主要选择指标为主藤长、地径和盖度。对比2种选优方法优缺点，确定主藤长和地径为野生雷公藤优树选择的指标；根据综合评价，共选出20个优良单株，并发现2种方法所选出的优良单株完全一致。

Application of Principal Component Analysis and Projection Pursuit to Superior Individual Selection of Tripterygium wilfordii

The selection standards for growth traits of superior individual trees of Tripterygium wilfordii were studied by means of the methods of Principal Component Analysis and Projection Pursuit respectively. The results showed that both of these two methods were applicable for the superior individual tree selection of T. wilfordii. The method of Principal Component Analysis was more appropriate to be adopted by taking coverage, length and the basal diameter of the main rattans as the main selection indices, while the method of Projection Pursuit was more suitable to be applied by taking the length of main rattans, the basal diameter and the coverage as the main selection indices. The length of the main rattans and the basal diameter were determined as the main selection indices for superior trees on wild T. wilfordii by comparing the advantages and disadvantages of the two methods. 20 superior individual trees were selected based on the comprehensive evaluation, and it was found out that the superior individual trees selected by the two different selection methods were exactly the same.