攀枝花苏铁类群的种子植物区系地理研究

苏铁是一类起源古老而孑遗的裸子植物,攀枝花苏铁国家级自然保护区内所保护的攀枝花苏铁Cycas pan-zhihuaensis,是迄今为止世界上发现的纬度最高,面积最大,数量最多的野生苏铁种群。攀枝花苏铁群落共有物种82科253属318种;珍稀濒危植物除攀枝花苏铁外,还有云南梧桐Firmiana major、栌菊木Nouelia insignis和龙棕Trachycarpus nana。区系组成以热带性质为主,尤以泛热带为多。单种科、单种属和寡种属占绝对优势,表现出区系明显的古老性和残遗性现象。干热河谷区系特征明显,金沙江干热河谷特有种和标志种占到总种数的近1/3。一些残遗种或其后裔的起源和发生背景与古地中海有密切关系。结合当地的丰富的苏铁类植物和种子蕨化石植物群的发现,可以初步推断攀枝花苏铁群落是这些古生代类型的延续,其植物区系起源古老。该地区应是中国植物区系的分化中心,也很可能就是世界苏铁植物重要的起源与发展中心。

Florogeographical Analysis of Spermatophytes in Cycas panzhihuaensis Assemblage

Cycads are a class of ancient relict gymnosperm.Cycas panzhihuaensis protected in Panzhihua Cycad National Nature Reserve,is wild cycad populations with the largest area and the largest number,and is found in the world's most northern latitudes.In cycad assemblage,there are about 318 wild spermatophyte species found,belonging to 253 genera of 82 families.In addition to Cycas panzhihuaensis,the rare and endangered plants are Firmiana major,Nouelia insignis and Trachycarpus nana.Tropical elements of cycad flo...