鄂西后河自然保护区蕨类植物区系地理研究

STUDY ON THE PTERIDOPHYTES IN HOUHE NATURAL PROTECTIVE REGIOH

初步探讨了后河自然保护区蕨类植物区系地理特点，结果表明：本区系蕨类植物种类非常丰富，起源十分古老，亚热带成分占居主导地位，温带成分的比例高，组成本区系各成分来源不同，发展极不平衡，鳞毛蕨科、水龙骨科、蹄盖蕨科拥有大量属种，显现出复杂性、优势性特色；本区系中国特有种占较大比重，与我国西南区相似率最高，可能处于我国蕨类植物的川东－鄂西特有现象中心，并支持了秦仁昌在中国蕨类植物地理分区中将鄂西划为西南区的观点。

The floristic phytogeographical features of the ferns in the Houhe natural protective region in Hubei are preliminarily discussed in this paper,the results are as follows:This region is very abundant in pteridophytes with an ancient floristic origin as well as the majority of subtropical elements and higher percentage of temperate elements.The elements in the flora are from different ones with unbalanced development,Dryopteridaceae.Polypodiaceae and Athyriaceae have a large number of the genera and species.Therefore,the flora is Characterized by complexity and dominance of the Pteridophytes.In the same time,there are a lot of Chinese endemic pteridophyte species in the flora which may be situated at the Eastern Sichuan-Western Hubei centre of endemism of Pteridophytes.Besides,these endemic species are most similar to those of Southwest-China flora,it supports Ching Renchang's view that the fern floristic in Western Hubei should be classified into the one of Southwest Chinese fern floristic region.