关键词: 西藏自治区, 藏东南地区, 被子植物, 果实类型, 不同生活型

Abstract: This article calculated the percentages of different fruit types of total angiosperms (5810 species, 28 varieties) and their life forms (trees, shrubs, herbs and lianas) distributed in Tibet and southeastern Tibet. The results showed that in Tibet capsule is the dominant fruit type(37.74%), followed by achene, nut and berry. The percentage of dry fruits is far bigger than that of fleshy fruits in Tibet. There are great variations in 4 life forms in fruit type spectrum. Drupe is dominant in tree, berry in liana, achene in shrub, and capsule in herb. Tree possesses the greatest percentage of fleshy fruit in 4 life forms, followed by liana, shrub and herb. In southeastern Tibet, capsule is also the dominant fruit type (37.54%), followed by achene, berry, drupe, nut and caryopsis. The larger differences occur among the percentages of various fruit types.Drupe is dominant in tree, berry in liana, capsule in shrub and in herb. In the 4 life forms tree possesses the largest percentage of fleshy fruits followed by liana, shrub and herb. The percentage of fleshy fruits is higher in southeastern Tibet than in the whole Tibet, and on the contrary, dry fruits is not. Such fruit characteristics are adapted to their environment and are results of long-term evolution. This study can help us in understanding a long term adaptation and evolution of fruits to their ecological environment.

Key words: Tibet, southeastern Tibet, angiosperms, fruit types, life forms