中国西北地区轮藻植物区系的研究

通过对西北四省区轮藻植物种群组成，种群分布，相似性比较，相似性系数等研究，发现该地区的轮藻植物不但种类繁多，种的组成与我国其它地区地有显著差异，具有该地区独特的分布特征。

STUDIES OF CHAROPHYTE FLORA IN NORTHWEST CHINA

specimens of charophyte flora were collected and identified form 33 cities and counties of four provinces in northwest China.They consisted of 28 species and 2 varieties belonging to 4 genera.The Charophyte flora in this region was formed by 2 species of Nitella,2 species of Tolypella ,1 species of Nitellopis ,and 23 species of Chara .Among them were 5 new species,2 new varieties and 2 new records. The charophyte flora in northwest China has the following features:1. The elements of the Charophyte flora of this region are mainly temperate species.2. The species of Chara are chiefly distributed in this flora.3. It is simple in consistence.4. There are a few endemie species in this flora.