三峡库区珍稀濒危植物的地理分布与区系特征研究

三峡库区蕴藏着丰富的珍稀濒危植物资源，据调查统计，库区有国家级珍稀濒危植物４９种，隶属于３４科４６属，珍稀濒危植物集中分布在库区中下游段，巴东、宜昌、巫溪、巫山分布较多。其区系特征可以归结为：（１）起源古老；（２）具有明显的温带性质；（３）中国特色成分显著，单种属、少种属较多。

The geographic distribution and floristic featuers of the rare and endangered plants in the Three-gorge reservoir region

Three gorge reservoir area of Yantze River is rich in rare and endangered plants.There are 49 national protected species,which belongs to 46 genera of 34 families.Most of them are distributed in and below the middle part of the three gerge reservoir region,and there are relatively more rare and endangered species in Xingshan,Badong,Yichang,Wuxi and Wushan than in other areas.The floristic features of rare and endangered plants here can be summarized as follows:(1)some flora of the rare and endangered plants in this region have ancient origin original.(2) The distribution types of 46 genera obviously posses a temperate nature.(3) Chinese endemic elements are notable.