Study on Vascular Plant Resources of Typical PlantCommunities in the Middle and Upper Reaches ofthe Yarlung Zangbo River

【Objective】 Through the investigation of plant resources in the middle and upper reaches of the Yarlung Zangbo River，it aims to provide a theoretical basis for the comprehensive development and protection of plant resources in this area.【Method】 In this study，the middle and upper reaches of the Yarlung Zangbo River were selected as research areas. The plot method was used to conduct field investigation of the plant communities in the research areas，and the related literature was used to study the plant resources of the vascular plants.【Result】 There are 34 families，68 genera and 96 species (including subspecies and varieties) of vascular plants in this area，accounting for 16.83%，5.48% and 1.66% of the total number of the families，genera and species of vascular plants in Tibet and 11.63%，2.02% and 0.31% of these in China. The growth form of vascular plants in this area is dominated by herbaceous plant，the life form of plants has comparative advantage in chamaephytes and hemicryptophytes and the ecological type has certain advantages in the distribution of mesophytes. There are 48 kinds of medicinal plants，40 kinds of ornamental plants，25 kinds of forage plants and 23 kinds of other economic plants (material plants，food plants，energy plants，germplasm plants and poisonous plants etc.). And 4 species of state second-class protected wild plants are distributed in this area.【Conclusion】In this area, the plant groups are relatively scarce，but they are rich in plants resources，which should be developed and utilized scientifically. And measures for the protection and management of rare plants should be strengthened.