鄂西木林子自然保护区种子植物区系的初步研究

2.2.1.2 东亚分布属的分析东亚分布是从喜马拉雅一直分布到日本的一些属。东亚分布属(包括变型)在本区系有91属,136种(包括变种),分别占本区系属种数的20.40%和13.01%,隶属于46科。中国东亚分布属共294属,木林子东亚分布属占其31.29%。本区系91属中木本属有48属。木本科18科。在这91属中,仅猕猴挑属(Actinidia)和沿阶草属(Ophiopogon)各有5种,25属2～4种,其他64属仅1种出现于本区系。给人印象深刻的是单种属达13属,占本区系该分布型的14.13%;少种属(2～6种)26属,占该分布型的28.26%;其中古老、孑遗的属种会多,也不乏较为特化的类群,这反映了该分布型植物在亚洲温带区系形成和发展中的关键性作用。

PRELIMINARY ANALYSIS ON SPERMATOPHYTE FLORA OF MULINZI NATURE SANCTUARY IN W. HUBEI

Mulinzi in W. Hubei is a natrue sanctuary rich in spermataphyte flora. It is now known by the study that there are 1043 species of 488 genera among 134 families (including subspecies and varieties, the same below). On the basis of the geographic distributional statistics of 134 families and the comparative analysis of 488 genera belonging to 15 distribution-types in Mulinzi flora, the author proflers that the spermatophyte flora of Mulinzi is obviously a temperate one but with abundant tropical elements. The temperate distributional families and genera are respectively 51.09% and 63.45% of the total(excluding those cosmopolitan families and genera, the same below) in Mulinzi, while the tropical distributional families and genera being 48.91% and 31.16% respectively, According to the comparative analysis of the Mulinzi flora which is percentages of species in World, China and Hubei flora, it is obvious that 15 families such as Betulaceae, Cornaceae etc. are the dominant families of the flora. There are a lot of ancient genera and families in the Mulinzi flora, especialy in the distributional families of E. Asian and Chinese endemic genera. Th(?) are 25 chinese endemic genera in which the archaic and new endemic genera are coexisting in the flore.. There are 131 species being distributed mainly or only over E. Sichuan-w. Hubei. They are 12.55% of total species of the flora. It is a strong tendency to differentiations and occurrences of species types. therefore author suggests that the E. Sichun-w. Hubei subregion is separated from Central China region in China flora.