中条山木本植物区系地理成分分析

ANALYSIS ON THE FLORA OF XYLOPHYTA IN ZHONGTIAO MOUNTAINS, SHANXI

中条山位于山西省南部 ,有木本植物 478种 ,隶属于 73科 1 6 4属。其中裸子植物 5科 1 0属 1 8种 ;单子叶植物 2科 2属 6种 ;双子叶植物 6 6科 1 5 2属 45 4种。分析结果表明 ,科、属、种的区系地理成分复杂多样 ,科的分布区类型以热带—亚热带—温带分布占优势 ,其次是温带分布 ;属的分布区类型以温带成分占优势 ,其中北温带分布型所占百分数最高 ,反映出该区系的温带性质 ;种的分布区类型中国特有分布的种数最多 ,其次是东亚分布、温带亚洲分布。该区系木本植物的起源具有古老性 ,区系地理成分的渗透性、交汇性和过渡性较明显。中条山是华北木本植物区系中珍稀濒危植物较为集中的地区 ,有国家级重点保护植物 1 5种。

Zhongtiao Mountains, located in the southern of Shanxi provi nce, is situated between 34°38′ - 35°50′ N latitude and 110°18′-112°37′E longit ude. There is atypical warmtemperate semiwetness continental monsoon climate in the mountains. It is now known that there are 478 species of xylophyta in Zhongtiao Mountains,which are belonged to 164 genera and 73 families. Among them there are about 5 families, 10 genera, 18 species in Gymnospermeae; 2 families, 2 genera, 6 specie s in Monocotyledoneae and 66 families, 152 genera, 454 species in Dicotyledoneae. Analysis of the floristic elements based on families, genera and species shows t heyare very complex in Zhongtiao Mountains. Tropic-Subtropic-Temperate element isdominant in families, Temperate floristic elements make significant dominant ingenera, in which percents of North Temperate distribution is the highest, the sp eciesnumber of Chinese Endemic distribution elements is most in species, secondly E. Asiaand Temperate Asia distribution elements, it is indicated that the flora has som e typicalcharacteristics of warm-temperate deciduous broadleave forest. It is obvious permeation,intersection and transition of the flora. Furthermore Zhongtiao Mount ains isricher area growing the rare and endangered xylophyta in the North China, It is nowknow that there are 15 species xylophyta of state-class conservation in Zhongtia o Mountains.