Abstract: A study of the distribution patterns of the shrub populations in the rhododendron community reveals that in the main sample plot of a relatively low altitude of 3080 meters above sea level,the competitiveness and adaptability of Rhododendron przewalskii abate among the shrub populations.Thus,the species aggregate in clusters to dot the mountain slopes,while Dasiphora fruticosa,Caragana jubata,Salix spp.,Rhododendron capitatum,R.thymifolium,and R.anthopogonoides,generally spread at random.With the elevation of the mountain altitudes,the distribution pattern of R.przewalskii changes from aggregated intensity to random spreading due to its stronger cold resistance than the other shrub species.Though the other rhododendron species and shrub populations change their distribution patterns somewhat at higher altitudes,their general distribution patterns remain.

Key words: Grassland science, Eastern Qilian Mountains, Rhododendron community, shrub population, distribution pattern

摘要： 对东祁连山杜鹃灌丛草地灌木种群分布格局的研究表明:在海拔高度相对较低的主样区(海拔3080m),陇蜀杜鹃在群落中的竞争能力和适应性受到限制,因而呈现出集聚程度较高的斑块状分布;柳属植物、鬼箭锦鸡儿、金露梅、烈香杜鹃、头花杜鹃和百里香杜鹃均为随机分布。随海拔高度上升,陇蜀杜鹃的分布格局由集聚型迅速转变为随机型,其余灌木则表现出一定程度的波动,但分布格局未发生根本性的变化。

关键词: 生态学, 植被生态, 东祁连山, 杜鹃, 灌丛, 分布格局