双峰山国家森林公园种子植物区系特征

双峰山国家森林公园有种子植物98科281属455种,其中裸子植物有4科7属9种,被子植物有94科274属446种。区系优势现象较明显,优势科和优势属以温带分布占优势;科属种地理成分分析表明,热带分布科占优势,温带分布属、种占优势,说明本区系以温带性质为主,并与热带区系有着较高的亲缘关系,表现出从热带向温带的过渡性质;不同地区植物区系R/T值及相似性系数比较研究表明,区系联系广泛,与华中、华东区系关系密切,更趋近于华东植物区系。

Flora Characteristics of Seed Plants in Shuangfeng Mountain National Forest Park in Hubei Province

A total of 455 species of seed plants are recorded in Shuangfeng Mountain National Forest Park of Hubei Province,belonging to 98 families and 281 genera.Among them,there are 9 species of gymnosperms from 4 families and 7 genera,and 446 species of angiosperms from 94 families and 274 genera.The dominant family and genus are distinct and widely distribute in the temperate regions.Analysis of geographical elements shows that the flora is dominated by tropical families,temperate genera and temperate species.It is obvious that the flora is temperate in nature and has a comparatively high affinity relationship with the tropical flora,exhibiting a transitional feature from tropical distribution towards temperate distribution.The comparison of R/T values and similarity coefficients of various florae indicates that the flora has extensive relationships with other florae,especially with Central China flora and East China flora,but the closest relationship with East China flora.