百里峡保护区维管束植物区系组成及特征分析

摘要

In order to further master the distribution and characteristics of vascular plants flora in Bailixia Nature Reserve in Sichuan,the methods of field investigation and document inquiring are adopted to systematically analyse the list of vascular plants in the Nature Reserves.The results showed that the vascular plants contain 156 families,685 genera and 1447 species.T heir species account for a large proportion in the w hole country and province,and the proportion is 4.98% and 15.64%,respectively. The few-species family is the main part of the fern flora,which accounts for 39.47%.Meanwhile,the few-species family of seed plants is the dominant family,which accounts for 40.60%.The floristic analysis showed that the geographical element is complex,wherein the temperate distribution has 342 genera and 775 species in total,w hich has obvious superiority,and the pantropical distribution comes the second.It show s the zonality of the vegetation in this region.%为进一步掌握四川百里峡省级自然保护区维管束植物区系分布和特征,文中主要采用野外实地调查结合查阅文献资料的方法,系统整理出保护区维管束植物名录并进行分析.结果表明,区系中有维管束植物156科685属1447种,其种数占全国、全省的比例分别为4.98% 和15.64%,说明物种多样性较为丰富.蕨类植物的组成以少种科为主,占比为39.47%;种子植物在科的组成上,寡种科占比40.60%,是该保护区的优势科.植物区系地理成分复杂,其中温带分布有明显优势,共有342属775种,其次为泛热带分布,体现了该区域内植被的地带性.