新疆种子植物科的区系地理成分分析

对新疆种子植物区系科的组成和地理成分进行了分析。结果表明,新疆种子植物区系地理成分多样,而以温带成分为主,共有55科,包括热带至温带、亚热带至温带、温带、温带至寒带的科,占总科数的47.8%,若除去世界广布科,则所占比例更高,达73.3%,纯粹的热带成分、热带至亚热带成分较少,这反映出新疆种子植物的分布与本地区所处的气候带相适应。该区种子植物的表征科和优势科分属于各类成分,但大部分为世界广布成分。本研究表明,在科级水平上,该区系是安加拉区系的一部分。

FLORISTIC ANALYSIS OF SEED PLANT FAMILIES IN XINJIANG

An analysis of the seed plant families in Xinjiang shows that the flora had a diverse geographical elements, with an overwhelming number of temperate elements (55 families) accounting for 47.8%, including tropical-to-temperate, subtropical-to-temperate, temperate, temperate-to frigid. The element accounts for 73.3% except cosmopolitan families, pure tropical and tropical-to subtropical families are lack in the flora. This phenomenon is the result of the broad latitudes and diversified habitats in Xinjiang. It is shown that the dominant famlillies and typical familes are of various geographical elements, whereas most of them are cosmopolitan. This indicates that, in family level, the seed flora of Xinjiang is an integral part of the Angala Flora.