平江幕阜山种子植物区系

The Flora of Seed Plants in Pingjiang Mufu Mountain

湖南平江幕阜山位于湘、鄂、赣3省的交界处,历史上没有对该区进行过系统的植物区系研究,属于植物区系研究的关键和薄弱地区．在科属水平上对该地植物区系特性进行了统计和分析．结果表明:优势科、优势属在森林植物群落的构建上作用显著;科的分布型说明．该地具有较强的热带亲缘性;属的分布型分析表明,该地区系为温带性质,区内保存有许多古老和残遗属,隶属于中国-日本植物区的华东地区;特有成分分析表明,该地拥有中国特有2科、18属,缺乏地方特有成分．

Pingjiang Mufu Mountain, which covers an area from above sea level 100 metres to 1 596 metres, is located at Hunan Province. There are 1 428 species of wild seed plants belonging to 165 families and 696 genera in this area. The statistics and comparatively intensive analyses of them at different levels were given in this paper. Based on the statistics, the results show that preponderant families and genera are prominent elements in Mufu Mountain. The analysis of the family areal-type demonstrates that they mainly consist of tropical families, and that the origin of flora has some tropical nature. Based on the analytic study of distribution patterns of genera, we conclude that the flora of Mufu Mountain is mainly temperate in nature because there are 280 tropical genera and 350 temperate genera. Many genera are monotype and oligotypic;and their archaic and relic nature is very obvious. Based on the percentage of Sino-Japan （35 genera） and Sino-Himalaya （16 genera）, it shows that Mufu Mountain is subject to East China of Sino-japan floristic region. The local endemism is relatively low with 2 families and 18 genera endemic to China, which maybe attribute to the lack of geographical isolations of this area.