秦岭南坡中段种子植物区系初步分析

秦岭南坡中段有种子植物152科，815属，2184种，对该地区植物区系进行了统计分析，结果表明，（1）本地区种子植物种类丰富，共有裸子植物5科，15属，30种，单子叶植物23科，169属，390种；双子叶植物124科，631属，1764种。（2）属的地理分布类型种类多，有15个分布类型及19个变型，其中温带成分占64.17%，具一定的优势。但同时表现亚热带成分向温带成分过渡的特点。（3）本地区植物古老、残遗、原始成分多，反映了该地区植物区系古老的性质。（4）有中国种子植物特有属41属。国家级保护植物32种，分析结果认为本地区是秦岭种子植物区系的重要组成部分。

A floristic analysis of the seed plants in the middle area of south slope of Qinling Mountains

There are 2 184 species seed plants belong to 815 genera in 152 families in the middle area of south slope of Qinling Mountain.Based on the statistics and analysis the results were as follows:(1) It is richer in number of seed plants which include 5 families,15 genera and 30 species of gymnosperms;23 families,169 genera and 390 species of monocotyledon;124 families,631 genera and 1 764 species of dicotyledon.(2) There are 15 areal type of genera of seed plants and 19 subtype in this region.It has 64.17% of various temperate areal type and 30.34% of tropical elements.So that,it is chiefly temperate in nature and certain transional nature with tropical and subtropical in this flora.(3) There are large proportion of archaic,relic and primitive plants in this area.This result shows clearly the ancient nature of this flora.(4) There are 41 genera Chinese endemic genera of seed plants and 32 species rare endangered plant.These analysis results showed that this region is an important composition of Qinling Mountain plant flora.