Abstract: Based on the integrative study of ecology and genetics of Allium wallichii in Mountain Jizu, the 8 popu-lations of Allium wallichii( including a population of Allium var. platyphyllum) can be divided into 6 ecotypes: one Allium var. platyphyllum ecotype,one rock diploid ecotype and four tetraploidecotypes (rock tetraploid eco-type, forest tetraploid ecotype, grassland tetraploid with white flower tetraploid ecotype, grassland tetraploid with purplish red flower ecotype) . The selection of ecological factors (light, soil and biological factor) and the three kinds of valid isolation mechanisms between the populations, such as the chromosomal ploidy variation (genetic isolation) between diploid population and tetraploid population, the habitat isolation between grassland tetraploid population and forest tetraploid population and rock tetraploid population and the phenologic isolation between grassland tetraploid with white flower populatoin and grassland tetraploid with purplish red flower population, for-est tetraploid population and rock tetraploid population etc. are the primary factors that caused the ecotypic for-mation of Allium wallichii in Mountain Jizu.

Key words: Jizu Mountain

摘要： 根据生态学和遗传学的综合研究，鸡足山地区的8个多星韭种群可划分为6个生态型：l个柳叶韭生态型，l个岩生二倍体生态型和4个四体倍生态型即林生四倍体生态型、岩生四倍体生态型、草生白花四倍体生态型和草生紫花四倍体生态型。多星韭种群生境中的光、土壤、生物等三大生态因子的强烈选择，以及多星韭二倍体种群和四倍体种群之间的染色体倍性差异（遗传隔离），多星韭四倍体种群中：林生种群与岩生种群之间、草生紫花种群与草生白花种群之间的物候隔离，草生种群（紫花和白花）与林生、岩生种群之间的生境隔离等三大隔离机制在鸡足山地区多星韭的生态型的形成过程中起着巨大的作用。

关键词: 鸡足山, 多星韭, 柳叶韭, 生态型, 隔离机制