山西种子植物区系地理研究

Floristic Diversity of Seed Plants in Shanxi Province

山西省植物种类多样性相对丰富,共有野生种子植物143科、816属和2 576种,科内属种分布极不平衡,有趋向大科分布特点;山西种子植物区系以温带分布区类型占绝对优势,共有410属、1 540种,分别占总种子植物总属数的50.2%,总种数59.8%;该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,在中国植物属的15个分布类型和31个变型中,该区系就占15个分布类型和16个变型。

This paper studied floristic diversity of seed plants in Shanxi Province using some basic methods and principles of the floristic geography and based on the composition and geography elements of the families, genera, species of plants from Shanxi Province. The results are as follows： The diversity is abundant in this area, there are 2576 species of seed plants in Shanxi Province, which belong to 816 genera and 143 families （not ineluding cultivated plants）. Among them there are about 6 families, 13 genera, 28 species are in Gymnospermeae; 137 families, 803 genera, 2548 species in Angiosperm, which shows the distribution of plants in Shanxi Province is consistent with the climatic features of the area. Analysis of the floristic elements based on families, genera, and species shows that they are very complex in Shanxi Province. Among the areal-types of Chinese genera of seed plants, there are 15 types and 16 subtypes in this area. Temperate floristic elements are significantly dominant in genera, in which percents of North Temperate distribution is the highest, 25.5% in the total number of genera in this area. It is indicated that this area has obvious temperate characteristics of the flora, and it also has the characteristices of permeation, intersection, transition and frangibility.