摘要
本文讨论了杨属的属下分类群 ;对各组的特征进行了比较 ;分析了各组及种类在世界及中国的分布。本文运用化石、古地理、古气候、孢粉区系、现代地理分布等证据对杨属的起源时间及地点进行了分析 ,认为杨属可能起源于晚白垩纪时的中国西南部和中部地区 ;最后讨论了杨属起源后的散布途径及现代分布格局的成因。
In this paper the taxonomic units and system of Populus L.are discussed,the characteristics of the five sections in Populus are contrasted and the distribution of species in Populus is analyzed.Evidences in fossil,paleogeography,paleoclimate,spore zone and modern distribution are employed to discuss the originating time and place of Populus.It is preliminarily deduced that Populus L.could originate from the southwest and middle regions of China in the late Cretaceous.In addition,the dispersal channels and the causes of modern distribution pattern are elaborated.
出处
《四川林业科技》
2004年第2期25-30,共6页
Journal of Sichuan Forestry Science and Technology
关键词
杨属
地理分布
起源
扩散
Populus L.,Geographic distribution,Origin,Dispersal
