四川林业科技2011，Vol.32Issue(6)：28-33,6.
攀枝花苏铁类群的种子植物区系地理研究
Florogeographical Analysis of Spermatophytes in Cycas panzhihuaensis Assemblage
郝云庆 1莫旭 2余志祥 2杨永琼2
作者信息
- 1. 四川省林业科学研究院,四川成都610081
- 2. 四川攀枝花苏铁国家级自然保护区管理局,四川攀枝花617000
- 折叠
摘要
Abstract
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 floristic composition are the richest,and in particular pan-tropical elements are plentiful.The overwhelming of single species families,monotypic genera and minor genera clearly exhibit the ancient flora and relict phenomenon.The total number of endemic species and characteristic species of dry-hot valleys in the Jinsha River account for nearly 1/3 of total species,indicating that the attributes of dry-hot valley flora are significant.A number of relict species or their descendants,their origin and occurrence background are closely related to the ancient Mediterranean.Taking account of local rich cycads and Pteridosperm fossil flora found,it can initially inferred that Cycas panzhihuaensis assemblage is a continuation of those ancient taxa,with the origin of the ancient flora.This region should be a differentiation center of the flora of China,is also likely to be the main origin and development centers for the world cycads.关键词
攀枝花苏铁/植物区系/地理成分/珍稀濒危植物/干热河谷Key words
Cycas panzhihuaensis/Flora/Phytogeography/Rare and endangered plants/Dry-hot valley分类
农业科技引用本文复制引用
郝云庆,莫旭,余志祥,杨永琼..攀枝花苏铁类群的种子植物区系地理研究[J].四川林业科技,2011,32(6):28-33,6.
