浑善达克沙地种子植物属的地理成分分析

运用植物区系地理学的基本原理,通过对浑善达克沙地种子植物属的组成、地理成分统计、排序和分析,结果表明:浑善达克沙地物种的多样性较高,属的分布区类型以温带成分占绝对优势,其中北温带分布型所占的百分比数最高,占本区种子植物区系中非世界属数的37.2%,其次是旧大陆温带分布,反映出该区系的温带性质,体现了浑善达克沙地植物分布与本地区的气候带相适应的结果。本区系具有一定数量的古老成分,地理成分混杂且具有明显的过渡性,同时该区系又具有明显的脆弱性；特有程度较低。

Analysis on Geographical Composition Genera of Seed Plants in Hunshandake Desert

Applying some basic methods and principles of the floristic geography,we have statistically analyzed on the composition and geography elements of plants genera in Hunshandake Desert.The results are as follows: diversity is abundant in Hunshandake Desert;temperate floristic elements are dominant in areal-types of genera,in which the percent of North Temperate distribution is the highest,makes up 37.2% in the total number of genera in this area,the following is the type of Old World Temperate.These reflect the distribution of plants in Hunshandake Desert adapt to climate zone in this basic area.The flora has a little old composition,show obvious transitional and fragile characteristics.Moreover,it has a lower level of endemic.