粤东蕨类植物区系初步研究

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。

Preliminary study on the pteridophyte flora of East Guangdong, China

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.