关键词: 毛刺锦鸡儿, 群落分类, 物种组成, TWINSPAN

Abstract: The Caragana tibetica community is a vegetation type distributed only in Central Asia region, in a transitional zone between desert steppe and desert. This community holds significant ecological value within its distribution area. However, research on its community characteristics and classification remains limited. Based on data from 55 plots surveyed across Nei Mongol, Qinghai, and Xizang, and combined with studies from books and literature, species composition, distribution pattern, community characteristics, and classification of C. tibetica community were analyzed. Results showed that (1) a total of 142 plant species were recorded in the C. tibetica community, belonging to 82 genera from 35 families. The community composition was dominated by Poaceae, Fabaceae, and Asteraceae, with 35 species of shrubs and subshrubs, 72 species of perennial herbs, and 35 species of annual or biennial herbs. (2) The floristic geographic elements were predominantly composed of species with a Gobi-Mongolian distribution (17.61%). Based on the degree of species presence, 126 species (88.73% of the total species) were classified as level I (0–20%), which were occasional species in the community. The life form was mainly composed of hemicryptophytes. In water ecological types, xerophytes (50%) and extreme xerophytes (14.79%) were dominated. (3) According to the life form and dominance of species, C. tibetica communities can be classified into 8 Association Groups: C. tibetica - Grass Association Group, C. tibetica + Allium Association Group, C. tibetica + Forb Association Group, C. tibetica + Shrubs - Grass Association Group, C. tibetica + Shrubs - Forb Association Group, C. tibetica - Subshrubs - Grass Association Group, C. tibetica - Subshrubs - Allium Association Group, and C. tibetica - Subshrubs - Forb Association Group. These Association Groups can be further divided into 34 Associations. The study of distribution, characteristics, and classification of C. tibetica communities can provide a reference for the plant resource utilization, classification, identification, and conservation management of C. tibetica.

Key words: Caragana tibetica, Community classification, Species composition, TWINSPAN