四川西南紫茎泽兰(Eupatorium adenophorum)入侵生境因子分析

Ecological Factor Analyzing of the Invasion of Crofton Weed in Southwestern Sichuan Province

于2003年5月—8月在四川西南部西昌,采用随机布设样地的方法对紫茎泽兰在该区域的入侵格局进行研究.通过量化紫茎泽兰样地的"海拔"等16个生态因子精确描述了该种外来杂草对具不同特征的各种生境的入侵.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可由三个综合因子表征,即"生态因子"(第一主成分)、"光湿因子"(第二主成分)和"植物多样性因子"(第三主成分).紫茎泽兰的发生频率与"林型"和"坡度"呈强烈负相关,而和"土壤湿润度"、"海拔"、"灌木数"、"杂草盖度"和"距耕地距离"、"坡向"、"距水源距离"、"样地植物种数"及"样地植物株数"9个生态因子正相关.

This preliminary study on invasion of crofton weed (Pamakani) (Eupatorium adenophorum) was conducted between May and August 2003 at Xichang in southwestern Sichuan Province of China. The invasive pattern was studied was studied by randomly sampling. Such 17 variables as 'Elevation' were be quantified to decide the different invasion of this dangerous alien species. The principal component analysis demonstrated that all the ecological message included in those variables could be decided by three most principal factors, ie. 'Factor of General Ecological Characteristics' (First Principal Component), 'Factor of Damp and Light' (Second Principal Component) and 'Factor of Botanic Biodiversity ' (Third Principal Component). In principal, the occurring frequency of crofton weed will be related to 11 ecological factors as 'Elevation', 'Landscape' etc..