粤东蕨类植物区系初步研究

Preliminary study on the pteridophyte flora of East Guangdong,China

通过对粤东蕨类植物的调查和统计分析得出:粤东地区共记录蕨类植物258种,隶属于45科95属,区系较为丰富;粤东的蕨类区系属于东亚植物区向古热带植物区的过渡地带,以水龙骨科、鳞毛蕨科、蹄盖蕨科、金星蕨科等12个科为优势科,以铁角蕨属、凤尾蕨属、鳞毛蕨属等10个属为优势属。从种的区系成分来看,粤东蕨类植物区系主要是热带成分与东亚成分的综合体,以中国—日本分布、热带亚洲、中国特有种分布为最丰富,反映了东亚与热带亚洲的蕨类植物区系的统一性和紧密联系。特有程度低于当地种子植物区系。与相关的6个地区的比较,说明纬度和海拔高度对区系的影响较大。

Based on statistics,analysis and flora comparison, the flora of pteridophyte in East Guangdong were studied. The results showed that： the floristic composing were relatively rich, there were 258 species belonging to 45 families and 97 genera. 12 dominant families were Polypodiaceae, Dryopteridaceae, Athyriaceae, etc. and 10 dominant genera were Asplenium, Pteris, Dryopteris, Sellaginella, etc. , indicating that the pteridophyte flora of East Guangdong belonged to transition district of Old Tropic Region and East-Asian Region. The dominant floristic elements of species were Tropic and East-Asian, especially the Sino-Japan and Tropic-Asia elements. The elements of endemic to China were less than the local seed plant flora. Through the comparison with 6 other flora, latitude and altitude were considered the main factors that influenced pteridophyte flora.