广西平天山种子植物区系研究

在实地考察和标本采集鉴定的基础上,对平天山种子植物区系进行统计分析。结果表明,(1)平天山维管植物种类丰富,有野生维管植物181科583属981种(含变种及亚种)。其中蕨类植物34科59属103种;种子植物147科524属878种,含裸子植物6科6属8种,被子植物141科518属870种。(2)植被区系地理成分复杂,以热带-亚热带成分占优势,热带性质与温带性质属数之比(即R/T)为2.90。(3)以菊科、禾本科、蝶形花科、大戟科、樟科、茜草科占优势;有4种国家重点保护植物,列入CSRL的植物有5种,列入CITES保护植物有7种。(4)起源古老,孑遗植物丰富。与大明山、岑王老山、大瑶山和十万大山4个区系的相似系数均高于50%。

Studies on Flora of Seed Plants in Pingtian Mountain of Guangxi

Based on field survey and specimen identification,the flora of seed plants in Pingtian Mountain in Guangxi was analyzed.The results indicated that: 1) The flora of Pingtian Mountain was rich.There were 181 families,583 genera,981 species(including varieties and subspecies).Of all the plants,there were 878 seed plant species,belonging to 524 genera and 147 families;103 fern species,belonging to 59 genera and 34 families;8 gymnosperm species,belonging to 6 genera and 6 families;870 angiosperm species,belonging to 518 genera and 141 families.2) The geographical composition was complicated,the components of tropical and subtropical were dominant,the R/T value of tropical to temperate was 2.90.3) There were some key protected plants in Pingtian mountain,including 4 national key protected wild species,5 CSRL species and 7 CITES species.4) The origin of the flora was ancient,with rich relic plant species,the similarity coefficients between Pingtian Mountain with Daming Mountain,Chenwanglao Mountain,Dayao Mountain and Shiwandashan Mountain were all higher than 50%.