贵州石松类和蕨类植物多样性与地理分布研究OA

In order to systematically update and analyze the plant checklist of lycophytes and ferns in Guizhou,and to provide a scientific basis for the biodiversity conservation and sustainable utilization in the region,we investigated relevant literature,databases,and specimen information,and conducted comprehensive statistics and analyses of species composition,distribution patterns,and floristic characteristics of lycophytes and ferns in Guizhou based on the PPG Ⅰclassification system.The main results were as follows:(1)Guizhou harbored exceptionally rich diversity of lycophytes and ferns,comprising 37 families,121 genera,934 species,3 subspecies,and 35 varieties.These included 3 families,9 genera,and 61 species(including infraspecific taxa,hereafter)of lycophytes,and 34 families,112 genera,and 911 species of ferns.(2)The dominant families included Dryopteridaceae(238 species),Pteridaceae(121 species),Polypodiaceae(117 species),Athyriaceae(115 species),etc.;the dominant genera included Polystichum(101 species),Dryopteris(84 species),Asplenium(48 species),Pteris(44 species),etc.(3)The province contained 20 nationally protected species from 7 families and 9 genera,as well as 47 threatened species from 13 families and 22 genera.(4)In terms of horizontal distribution,species richness was the highest in Qiannan Buyi and Miao Prefecture(586 species)and the lowest in Liupanshui City(224 species),with a vertical distribution pattern showing a"mid-domain effect"with a maximum species diversity at 900-1 300 m elevation.(5)In terms of ecological types,terricolous species were the most abundant(533 species),followed by saxicolous(264 species),epiphytic(99 species),terricolous-saxicolous(69 species),with aquatic species being the rarest(7 species).(6)Floristic analysis at the genus level indicated that the lycophytes and ferns of Guizhou were dominated by tropical elements,consistent with the tropical dominance characteristics of Chinese fern flora.In conclusion,the results of this research not only enhance the fundamental data on lycophytes and ferns in Guizhou,but also provide critical support for advancing regional botanical surveys,ecological conservation planning,and biodiversity research.