在我国西南高山地区剧烈的历史地质和气候变化背景下，出芽式物种形成和生态物种形成极有可能是该地区植物多样性形成的重要方式，但目前为止，在此区域内深入研究这些物种形成过程的案例还非常少。本项目拟选取分布于高山流石滩的短葶韭和它的最近缘物种，即分布在高山灌丛（草地）上的太白韭为研究对象，通过对它们的遗传关系、分化历史、杂交以及历史基因流的深入研究，验证短葶韭是否是由祖先种太白韭通过出芽式和生态物种形成的方式产生，并探讨太白韭和短葶韭伴随着基因流的物种形成过程，以及其物种形成过程与第四纪气候振荡造成的生境动态变化之间的联系。拟通过本研究，增进我们对高山植物多样性具体形成模式的理解，并为小地理范围内的生态或出芽式物种形成提供一个经典案例。

Against the background of the drastic historical geological and climate changes in alpine area of southwest China, budding speciation and ecological speciation maybe two important mechanisms for plant diversity in this region. However, very few studies have focused on the processes of these speciation patterns in this region. In this study, Allium nanodes and its most related species Allium prattii, which grows on alpine screes and in alpine shrubs (meadow) respectively, are chosen as a model system. We are going to study their genetic relationship, divergence history, hybridization and historical gene flow. We try to confirm that A. nanodes originated from its ancestral species, i.e., A. prattii from the models of ecological and budding speciation, and to study the divergence process of A. prattii and A. nanodes with gene flow. We also want to find out the relationship between their speciation and the landscape dynamics created by Quaternary climatic oscillations. This study will increase our understanding on the formation of alpine plant diversity, and to supply a typical example for ecological or budding speciation in a narrow geographical range.