鄂东南幕阜山区种子植物区系研究

鄂东南幕阜山区共种子植物１８３科７４１属１６５３种。以属的分析为主，结合科的分析，认为本地区种子植物区系为温带性质。本地区温带分布型属占总属数（剔除世界分布属）的５３１３％，热带分布型属占总属数的４２４５％，缺乏典型的热带科属。从植物区系现状和历史分析中，论证了本区系白垩纪—第三纪古热带起源的历史背景。确认本地区主体上属于中国—日本森林植物区系的华东地区，但富含华中区系成分，具有浓厚的华中区系色彩。本地区南北和东西植物交汇，具有复杂区系成分。论证了鄂西南武陵山—幕阜山脉一线可能是西南成分向东迁移的通道之一。本地区特有现象不明显，共有中国特有属２４个，无地区特有属，只有少数地区特有种。

THE FLORISTIC STUDIES ON SPERMATOPHYTE OF MUFU RANGE, SOUTHEASTERN HUBEI PROVINCE

This paper has recorded 1653 species of 741 genera among 183 families of spermatophyte plants in the Mufu Range area, SE. Hubei province, which is situated between 113°36′～115°30′E, 29°02′～31°15′N. Based on the analytic study of distribution patterns of genera and families, it is concluded that the flora of the Mufu Range might be mainly temperate in nature. Although this flora belongs to the East China region of the Sino-Japanese forestry subkingdom accoring to C. Y. Wu (1979), it is also abundant in the floristic elements of SW. China-Central China regions. Many species both from north and south occur simultanteously in this transient area between the middle subtropical zone and northern subtropical zone, so that it is a compound flora of various derivation in this area. It is demonstrated that the route from Wuling range to Mufu range might have acted as an important migration passage for the floristic elements migrating from Southwest China to Eastern China and vice versa, which may be referred to as Wuling Mufu Range Corridor. The local endemism is relatively low with only a few endemic species such as Sasamorpha hubeiensis,which may be attributed to the lack of geographic isolations of this area.