紫茎泽兰在广西的入侵生境因子分析

文章采用随机布设样地的方法对广西各地的紫茎泽兰（Eupatorium adenophorum）入侵区域的入侵格局进行研究。通过量化紫茎泽兰样地的海拔、坡度、坡向等16个生境因子，精确描述了该外来杂草对具不同特征的各种生境的入侵格局，对其进行主成分（PCA）分析。结果表明：描述紫茎泽兰生境的16个生态因子所含的生态信息由四个综合因子表征。紫茎泽兰的发生频率与坡向、水源距、耕地距、植物总数、海拔、土壤湿润度、乔木高度、坡度、植物种数等生态因子正相关，与灌木数、杂草高度、杂草盖度、气温、乔木大小、林型、空气湿度等生态因子呈负相关。

Ecological fator analyzing of the invasion of Eupatorium adenophorum and Eupatorium odoratum L. in Guangxi

The invasive pattern was studied by sampling randomly. Such 16 variables as＂elevation＂, ＂slope-orientation＂, ＂slope-deflection＂, ＂landscape＂, etc. were be quantified to decide the different invasion of these dangerous alien species. The results show that the principal component analysis demonstrated all the ecological message of Eupatorium adenophorum and Eupatorium odoratum included in those variables could be decided by four most principal factors. In principal, the occurring frequency of Eupatorium adenophorum will be related to 16 ecological factors as ＂elevation＂, ＂temperature＂, ＂slope-orientation＂, etc. The occurring frequency of Eupatorium odorarum will be related to 16 ecological factors as ＂slope-deflection＂, ＂Landscape＂, etc.