浑善达克沙地维管植物区系分析

对浑善达克沙地维管植物科的组成和地理成分进行了分析，并与内蒙古植物区系进行比较。结果表明，浑善达克沙地植物种类相对丰富，植物区系地理成分多样，而且以温带成分为主，共有野生维管植物93科，其中种子植物84科，占总科数的90．3％，这反映出浑善达克沙地植物的分布与本地区的气候带相适应；该区维管植物的优势科分属于各类成分，但优势科大部分为世界广布成分；植物区系成分起源古老，地理成分复杂且具有过渡性；同时该植物区系具有明显的脆弱性。

FLORISITIC ANALYSIS OF PLANTAE VASCULARES IN HUNSHANDAKE SAND

The composition and geography element of plantae vasculares Families in Hunshandake sand were analyzed and compared with the plant flora in Inner Mongolia. The results were as followings: The varieties of plant are plenty in Hunshandake sand. The geography element of plant flora is varied and the main is the element of the Temperate Zone. There are 93 families of wild planate vascular and 84 families of seed plants, which are 90.3 per cent of all families. This indicated that the plant distribution of Hunshandake sand adapts to the climate zone; the dominant families of plantae vasculares belongs to the different element respectively, but most of dominant families are the worldwide element;and the original of the element of plant flora is very ancient. The geography element is complex and transitive; in addition, the plant flora is significantly vulnerable.