湖南康龙自然保护区蕨类植物区系特征分析

Studies on floristic characters of pteridophyte in Kanglong Natural Reserve,Hunan

对康龙自然保护区蕨类植物的区系及其分布特征进行了分析。结果表明,该区蕨类植物共计36科77属202种(含变种),分别占湖南蕨类植物科、属、种总数的67.92%、51.68%和28.13%。其科、属组成的优势现象明显,含5属以上的科有6个,含10种以上的属有4个。地理成分古老,联系广泛,在科、属的水平上,均以热带成分为主,分别占科、属总数的58.33%和55.84%,而在种的地理成分上,热带成分(42.08%)略高于温带成分(40.10%),反映了该区蕨类植物种的区系由热带性质向温带性质过渡的特征。区系起源古老,该区中国特有种较丰富,共有31种,但没有特有的科、属分布。该区蕨类植物区系与鹰嘴界和衡山的相似性最高,联系最为密切,与三清山、雷公山和赤水的联系也较密切,而与庐山和壶瓶山的关系较为疏远,联系薄弱。

Floristic characters and distribution pattern of pteridophyte in Kanglong Natural Reserve, Hunan, China were analyzed. The results show that 202 species, 77 genera and 36 families were recorded, accounting respectively for 28.13%, 51.68% and 67.92% of ferns in Hunan province. The floristic elements were mainly tropical elements in the familiar （58,33%） and generic （55,84%） level, but tropical elements （42.08%） with a certain proportion of temperate-zone elements （40.10%） in the species level. The flora expressed a transitional characteristic from tropical to temperate. The origin of the flora is very ancient with 31 Chinese endemic species. Compared with other regions, the floristic composition of Kanglong is most closely related to that of Yingzuijie and Hengshan floras, more closely related to that of Shanqinshan, Liegongshan and Chishui floras, and hasn＇ t so much relations with Lushan and Hupingshan floras.