关于植物群丛划分的探讨

在传统的植物群落分类系统中,群丛是植物群落分类的基本单位.从群丛分类的必要性出发,综述了传统植物群落分类系统中对群丛的定义及其划分方法,即在群丛的划分中主要依据群落中不同层片的优势种或特征种；但是在利用传统植物群落分类方法划分群丛时也存在一些不确定性因素,主要表现在确定群丛的特征种(组)时需要人为确定；同时,论述了当前植物群落数量分类的研究现状,分析了利用双向指示种分析法(TWINSPAN)、主成分分析(PCA)等数量分类方法划分群丛时存在的一些问题,主要表现在数量分类结果与传统分类单位的对应关系不能达到协调一致,无法判断是否划分到了群丛的水平.最后提出了群丛划分方法的展望:数量方法是基础,特征种(组)是及其数量特征是关键.

Discus for classification of plant association

In the traditional community classification system, Association is a basic unit of plant community classification system. the necessary of association classified is put forward at first, the concept and classification method of association in traditional plant community classification system are summarized,that is, dominant species or characteristic species(group) in different layers of community are main evidence for dividing association. But there are some uncertained factors for dividing association in traditional classification system, such as, characteristic species(group) for association are affirmed artificially.On the other hand, research state of community quantitative classification today is narrated, TWINSPAN, PCA are mian methods for plant classification,and some problem when them are used. The relations between the results of quantitative classification and traditional community classification unit aren''t unanimous, it is difficult to judge whether associations have been divided. At last, prospects of association classification are brought: quantitative methods are basic, characteristic species(group) and its quantitative character are key.