摘要
种及种下特有现象的研究，对于认识特定的山地条件下的植物区系及生物多样性具有一定的理论和实践意义。峨眉山古老的生物地质历史，复杂多样的环境因素组合是形成区域性特有植物类群的共同背景。当地区域性特有种子植物及种下等级约有６７个，占当地种子植物种类的２８％。其植物区系表现了以温性为主，热性为辅，中国特有属中地区性特有种较高的特征。同时，当地特有种分化强烈，不少特有种具备残遗－分化复合性特征。峨眉山特有种子植物的垂直分布，以海拔１０００～１７００ｍ（～２０００ｍ）的中低山区为集中，７１６％的种群垂直分布幅小于４００ｍ。多数特有种子植物，尤其是草本植物为阴性或耐阴性的变类群。上述特有种的形成与演化同历史环境要素存在不同程度的因果关系，而与自身的竞争繁殖与传播能力存在必然的内在联系。
Study on the endemic phenomenon of species and variants under species is provided with a significance of theory and practice to recognize the flora and biodiversity in the mountainous region. The ancient history of biology and geology and the combination of complex and various environments is a common back ground of forming the local endemic plants in Emei Mountain. There are 67 species or variants as the local endemic plants which occupy 28% of the seed plants there. The major speices belong to warm flora when a few come from tropical flora. And the species rate in the Chinese endemic genera gets quite high. In the same time, the differentiation of these endemic species is very intensive and no less species show the relicdefferential complex features. These endemic plants distribute mainly at the lowermiddle position, elevation 1000～1700 m(～2000 m), of the mountainous and the vertical ranges about 716% of them do not exceed 400 m. Most of them, especially almost all of the herbaceous species are shade of tolerantshade. The formation and evolution of these endemic plants is relation to the history and environment in some degree and necessarily to the capabilities in their competition, propagation and dissemination.
出处
《生物多样性》
CAS
CSCD
1998年第3期213-219,共7页
Biodiversity Science
关键词
特有种子植物
复合特征
峨眉山
种子植物
endemic seed plants, reliedefferential complex feature,Emei mountain
