摘要
根据种的现代地理分布、分布区类型、地理宗的替代关系和生态特点对中国黄耆属植物的旱生类群进行了研究，结果表明，国产该类群植物 ９３ 种，可划分为 ８ 个分布区类型和 １４个亚型。依其生态地理分布规律，又可将这些类群划分为 ４ 个生态系列或称为生态区，即帕米尔—昆仑—羌唐生态区、天山—阿尔泰生态区、伊犁—塔城谷地生态区和蒙新荒漠东部生态区。分析认为，黄耆属植物旱生类群的区系发生在中亚西部，中国类群的发生具有显著的中亚西部亲缘或为其向东的延伸，它们在中国具有多种可能的扩散途径。
The xerophilous groups of Astragalus consist of 2 subgenera with medifixed hairs,Subgen. Cercidothrix Bge.and Subgen. Calycocystis Bge.,which are considered more advanced than those with basifixed haris.Species from the two subgenera are xerophytic in morphology and adapted to dry or aird conditions.According to our survey,c.90 species of the groups occur in China and they can be classified into 8 areal types and 14 subtypes.Although those species are almost concentratively distributed in Pamir Tianshan Altai region of Xinjiang,some of them have spread along mongolia Altai step pe zone eastward to Mongolia Plateau and N.China and in a later time taken place a new secondary diversification center.With reference to their eco geographical patterns of distribution,we have delimited all the species into 4 ecological series or ecological regions,i.e.Pamir Kunlun Qiangtang Ecological Region,Tianshan Altai Ecological Region,Ili Tacheng Ecological Region and East Mongolia Xinjiang Desert Ecological Region.It is tentatively supposed that the floristic origin of the exrophilous Astragali might be in western part of Middle Asia,from which place species spread in all directions,and dispersed into China.Obviously,the later has a close affinity in its exrophilous Astragalus flora with the former,and the species from those groups may have some possible dispersal routes in China,some may have taken roles in history,which are also discussed in this paper.
出处
《西北植物学报》
CAS
CSCD
1999年第3期487-493,共7页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金
关键词
黄耆属
旱生类群
区系特点
生态地理分布
Astragalus
xerophilous groups
floristic characteristics
eco geographical patterns of distribution
