河西走廊地区植物的区系特征-植物研究.PDF

21 　 1 　　　　　　　　　　　　　　　　　　　　　　 200 1　1 Vol.21　No.1　　　　　　　　　　　BULLET IN OF BOTANICA L RESEA RCH Jan., 　200 1 陈　鹏　潘晓玲 (, 　830046) 　　河西走廊位于甘肃省西部, 属于典型的内陆干旱区, 为温带荒漠气候。 对河西种子植物 区 的组成、特点及性质进行了分析, 并比较了它与邻近地区植物区 的关 , 主要结论如下:1. 种类贫乏, 本区共有种子植物52 科, 166 属, 326 种。属种比值高达50 .92 %。 区 具有明显的优 势现象, 仅5 个科就包含了全区植物百分之五十以上的属和种;2.区 中温带成分占绝对优势地 位, 古地中海成分也是重要的组成部分;3.本区 的植物在生活型方面以多年生灌木、草本为主。 植物区 具有明显的荒漠植物区 特征。4 .河西植物区 成分较古老;5.河西地区、塔里木盆 地、柴达木盆地、阿拉善地区无论是区 组成或发生方式都非常接近, 共同组成中国西北荒漠植物 区 。 　河西走廊;植物区 ;特征 THE FLORISTIC CHARACTERISTICS IN THE AREA OF THE HEXI CORRIDOR CHEN Pen 　PAN Xiao-lin (Institute of Desert Ecolo y and environment, Xinjian University, Urumqi 830046) Abstract　The Hexi Corridor is located in the western part of the Gaansu Province, belon in typical interior arid re ion and characterized in the temperate desert climate.There are 326 species of seed plants, w hich belon to 52 families and 166 enera.The floristic characteristics in the area are as fol- lows:1.Species are poorer, the seed flora in Hexi Corridor consists of 52 families, 166 enera and 326 species.The ratio of enus and species is 50.92%.Floristic dominance is obvious in this area, 5 dominant families contain more than 50 percent of enera and species in the flora;2.The Temperate Zone is superior to numbers of species in the area;3.On the life form of plants of the flora, it is pri- mary perennial herbs and shrubs;the Hexi Corridor has obvious characteristics of Temperate Desert; 4.The ori in of flora in the Hexi Corridor is older;5.Quantitative comparison and analysis on florae in the Hexi Corridor and in related area such as Alashan, the Tarim Ba