广东大瑶山维管植物区系的基本特征

广东大瑶山地处南岭山脉南部的中亚热带地区, 25°11'18"N, 113°13'02"E,有野生维管植物1411种(含变种),隶属于194科701属。其中蕨类植物132种,所占比例较大,表明植物区系起源古老。区系表征科与植被优势科为壳斗科、山茶科、樟科、木兰科、金缕梅科、桑科、紫金牛科、山矾科等,说明该地域是华夏植物区系的重要组成部分。种子植物属的分布区类型中泛热带分布占优势,同时热带、温带区系成分均有不同程度地侵入,区系成分复杂,充分体现出其原始古老的自然性与植物种类的多样性。

THE FLORISTIC CHARACTERISTICS OF VASCULAR PLANTS AT DAYAO MOUNTAIN,GUANGDONG PROVINCE

Dayao Mountain in Guangdong Province, is located at the middle sub-tropical region and at long.113°13'02"E. by lat. 25°11'18"N. Recent investigation on flora of vascular plant shows that it has a total species (including varieties) of 1411 belonging to 194 families and 701 genera. The fern of 132 species has a high rate in the flora and indicates the flora is an old one. The characteristic families of flora and vegetation are Fagaceae, Theaceae, Lauraceae, Magnoliaceae, Hamamelidaceae, Moraceae, Myrsinaceae, Symplocaceae, etc., all of which are the basic elements of Cathayasian flora. Phytogeographically, the pan-tropical genera are common, meanwhile the tropical elements and temperate elements also appear in this area, but most of them include only a few species. It's possible to believe that this area is the north border of the tropical plant and the south border of the temperate plant. The composition, which is complex, shows the nature of old origin and species diversity of plant are typical in the flora of Dayao Mountain.