关键词: 壳斗科, 地理分布, 西藏, 喜马拉雅

Abstract: Distribution of Fagaceae from Tibet has been discussed based on field expedition in Tibet and taxonomical research at present paper. There are 3 genera including 33 species of Fagaceae in Tibet, Castanopsis with 7, Lithocarpus 11, Quercus 15 (subg. Cyclobalanopsis 8). Most of them are concentrated in river gorge area of southeast Tibet particularly, Medog and Nyalam of Himalayas. Castanopsis indica, C. hystrix, C. tribuloides, Lithocarpus collettii and L. xizangensis are dominant elements in vegetation of river gorge area altitude below 2000 meter of southeast Tibet and Q. lanata, Q. kiukiangensis and Q. lamellosa are dominant in the area of southeast Tibet, altitude range from 1800 to 2500 meters. Above 2500 meters in this area Q. aquifolioides is dominant. Floristic elements analysis are also made at present paper. Beech plants in Tibet are divided into 7 kinds of floristic elements. They are tropical India, Himalaya to Indo-China distribution pattern, Indo-China to west Himalayan distribution pattern, Himalayan to Japan distribution pattern, Sino-Himalayan distribution pattern, endemic to east Himalaya, endemic to Tibet and endemic to China distribution. Among of them, tropical India, Himalaya-Indochina, Sino-Himalayan and endemic to east Himalayan are the most abundant.

Key words: Fagaceae