陕西马家山蕨类植物的区系特征初步研究

Preliminary Study on the Floristic Features of Fern in Majiashan of Shanxi

对马家山蕨类植物区系组成及分布特点进行了初步研究。结果表明:马家山共有蕨类植物27科54属131种。优势科为水龙骨科、鳞毛蕨科、中国蕨科、金星蕨科,共有66种,占该区总种数的50.4%;优势属为木贼属、凤尾蕨属、铁线蕨属等9个,共52种,约占其总种数的39.6%。科、属结构较简单,科的地理分布类型以世界分布为主,并与温带区系有着较强的联系;属的地理分布以温带为主,同时也表现出热带、亚热带向温带过渡的特性。种的地理分布中,东亚与中国特有成分显著,共占该地总种数的57.2%,与其古老的地质和优越的水热条件密切相关。这表明马家山应属于中国-日本蕨类植物亚区。

The floristic composition and distributing features of fern in Majiashan of Shanxi were researched preliminarily.The results showed that there are 131 fern species,belonging to 55 Genera and 27 Families.Dominant Families are Polypodiaceae,Dryopteridaceae,Sinopteridaceae and Thelypteridaceae,total 63 species,which account for 48.1% of total species in this area;there nine dominant Genera（Equisetum L.,Pteris L.,and Adiantum L.et cetera）,52 species,which account for about 39.6% of total species.The structure of families and genera is simple,the geographic distribution type of families mainly is global distribution,and having closer contact with extratropical flora;the geographic distribution of genera mainly is extratropical element,meanwhile shows some transition features from tropic or subtropics to extratropical element.In the geographic distribution of species,the special species in East Asia and China take a larger proportion,which account for 57.2% of total species in this area and having closer contact with ancient geology and superior water and heat conditions.Therefore,the Majiashan belongs to China-Japan fern sub-region.