中国帕米尔高原种子植物的区系地理研究

Study on floristic phytogeography of seed plants in the Pamirs of China

关键词:  区系地理  种子植物  中国帕米尔高原

Key words:  flora  seed plant  Pamirs of China

摘要:

中国帕米尔高原约有种子植物59科303属963种(包括变种)。分析表明:该区种子植物区系的地理成分较为复杂,联系广泛。温带性质的属有254属,占总属数的83.8%,热带性质的属有13属,占总属数的4.3%; 温带性质的种有723种,占总种数的75.1%,热带性质的种有17种,占总种数的1.8%。表明该地区植物区系具有明显的温带性质,同时受到热带植物区系的影响。另外在区系科属分级水平上,寡属科、单属科占绝对优势,而超过20属的大科在该区仅有3科,却占总属数、总种数的35.9%和38.6%,区系优势现象十分明显; 单种或少种属也较多,属种比值偏高,表明区系组成上的复杂性。

Abstract:

The flora of Pamirs consist of 963 species of seed plants belonging to 59 families and 303 genera. Based on the analysis of the floristic elements at family,genera and species level,there are some conclusions as follows:The floristic elements of the Pamirs of China are complex. Almost all kinds of distribution types are more or less represented here. Among the genera distribution patterns,the floristic elements with 83.8% temperate genera and 4.3% tropical ones reveal dominant temperate property. And in the species distribution patterns,the flostric element with 75.1% temperate species and 1.8% tropical ones indicate that the flora is temperate in nature flora. From the level of families and genera,predominant families are minor-genera family and one-genera family. There are only three numerous-genera family which is more than 20 genera,but the number of genera and species auounts for 35.9% and 38.6% respectively to the total,so phenomenon of the flora is obviously; single-species or minor-species genera is more,the ratio of genera and species is high,so composition of floristic is complex.