前言 近二、三十年来,随着数理统计方法及电子计算机在植被研究中的广泛应用,现代生态学派在理论和实践上都取得了重大进展,日益完善,排序和梯度分析已成为植被分析的重要手段。所谓群落排序,就是在一根或几根轴上排列群落的空间位置,研究群落的组成变化,比较种和环境因子,建立某种生态学上因果关系的假说。由于排序采用了植物种为变量的大量数据,并以相互关联的方式进行处理,较真实地反映了种和群落与 Preface In recent two or three decades, with the extensive application of mathematical statistics and computer science in vegetation research, the modern ecology school has made great progress both in theory and in practice, and has been perfecting day by day. Sequencing and gradient analysis have become the key points of vegetation analysis Important means. The so-called community ranking is to arrange the spatial position of the community on one or a few axes, study the community composition changes, compare species and environmental factors, and establish some ecological causality hypothesis. Due to the large amount of data that the plant species is used as a variable and is processed in an inter-related manner, it more accurately reflects the species and community