小寨子沟自然保护区种子植物区系分析

Analysis on the Components of Seed Plants Flora in Xiaozhaizigou Natural Reserve

在野外调查和分类的基础上,报道了小寨子沟自然保护区种子植物区系的统计分析结果。现知该区域有种子植物137科、621属、1558种(含种下分类群)。种子植物区系分析表明:(1)种子植物种类丰富,有裸子植物7科、14属、26种;被子植物130科、607属、1532种。(2)区系成分复杂,属的地理分布有15个类型。其中温带分布占64.74%,热带分布占31.02%,温带分布占一定优势。(3)原始、残遗植物成分较多,表现出植物区系的古老性。

Based on investigation and statistical analyses,the flora of seed plants of Xiaozhaizigou Natural Reserve has studied in the present paper.There are 1 558 species seed plants belonging to 621 genera in 137 families in the natural reserve.Based on the statistics,the results are as follow:(1)It is richer in number of seed plants with 26 species(belonging to 14 genera in 7 families)of gymnosperms;1 532 species(belonging to 607 genera in 130 families)of dicotyledon.(2)There are 15 areal types of genera of seed plants.It has 64.74% of various temperate distribution types and 31.02% of tropical elements.(3)There are larger proportion of archaic,relic and primitive plants in the natural reserve.