庐山蕨类植物区系研究

Pteridophytic flora in Mt.Lushan

关键词:  区系特征  蕨类植物  庐山  江西省

Key words:  floristic relation  Pteridophytic  Lushan  Jiangxi Province

摘要:

庐山共有蕨类植物39科87属247种(含变种、变型),其区系带有热带和温带双重性。其中鳞毛蕨科、水龙骨科、蹄盖蕨科、金星蕨科和铁角蕨科属种优势明显,共有38属160种,分别占总属数的43.7%和种数的64.8%,代表了该地区蕨类植物区系的一个重要特征。该区区系地理成分复杂,相互交错,其中热带性属占总属数的64.2%,温带性属占总属数的35.8%。东亚成分在该区系占有绝对优势,共有14属,占总属数的20.9%,中国特有属缺乏,特有种丰富,表明成分具有多样性并具有热带亲缘性,是亚热带向北温带的过渡地区。该区与井冈山、武夷山关系密切,与鼎湖山、秦岭和横断山关系疏远。

Abstract:

There are 247 fern species and varieties of 87 genera and 39 families in Mt.Lushan. The floristic elements analysis shows that the pteridophytic flora of Mt.Lushan is of temperate and tropical features. Among them,there are 38 genera with 160 species of Dryopteridaceae(6 genera,50 species),Polypodiaceae(11 genera,30 species),Athyriaceae(10 genera,30 species),Thelypteridaceae(9 genera,28 species)and Aspleniaceae(2 genera,22 species),accounting for 43.7% of the total genera and 64.8% of the total species respectively,which can stand for the important feature of some fern flora in the area. The pteridophytic components are complex and inter-located,but the majority of them are tropical and temperate including 43 genera(64.2%)and 24 genera(35.8%)of total genera respectively. The East-Asia element is predominant and including 14 genera,accounting for 20.9% of the total genera. The endemic genera are rare and the endemic species are abundant. This also shows that flora is transition from subtropical elements to north temperate. The flora is much more closely allied to Mt.Jinggangshan and Mt.Wuyishan than to the others.