Abstract: Glycine soja mainly distributes in eastern Asia, and its germplasm is abundant in China. However, G. soja is under the threat of extinction because of human disturbances, and has been ranked as an endangered species in China. For its conservation, 28 species in G. soja community were studied with Spearman’s rank correlation to assess the interspecific relationships of G. soja community in Beijing. The results indicated that there were no significant relationships between G. soja and most of other species, which implied thatG. soja was distributed independently in the community. The species having ositive associations with G. soja owned similar biological features and habitats, while those having negative associations with G. soja wned different biological features and habitats. Most interspecific associations of species-pairs among the 28 species were not significant, which indicated that the community development was not perfect, and the interspecific relationship was not stable. Analyses of rank correlation coefficient and niche overlap showed that the degree of niche overlap was high when interspecific association for pairs of species was high. The 28 species were divided into 4 ecological groups by using rank correlation and niche overlap, and the species in the same ecological groups had the same utilization ways of resources and the same ecological demands.

Key words: Leymus secalimus, Vegetative reproduction generation, Tiller, Rhizome, Bud, Module, Age structure, Clone growth