关键词: 蕨类植物, 区系分析, 对比分析, 重庆

Abstract: The paper report the floristic components and geographical distribution of the pteridophyte in Chongqing. The statistics and analysis of the pteridophytes floristic composition and geographical elements between Chongqing city and other regions are also discussed, the results indicate as follow:(1)It is now known that there are 389 species (including varieties) of fern in Chongqing city,which belong to 109 genera and 43 families.(2)The dominant families and genera are prominent.The dominant families are Dryopteridaceae, The lypteridaceae, Polypodiaceae, Athyriaceae, Pteridaceae; The dominant genera are Dryopteris Adens, Polystichum Roth., Pteris L., Asplenium L., Lycopodioides Boehm., Coniogramme Fee. (3)The flora of pteridophyte in Chongqing has typical characteristics of tropic distribution compositions.There are 22 tropic families in the area which account for 75.00% of overall families; There are 60 tropic genus in the area which account for 64.52% of overall genus(% excepting the families of cosmopolitan). (4)The flora are ancient origin and complex in geographical, the ancient families and genus are abundant, but endemic families and genus are scare.(5)The pteridophyte get great development and far distance distribution because of the advantageous climax and landforms in the area.(6)Comparative and clustering analysis can clearly reflect the differences of flora,the result indicate the region are much more closely allied to Tibet, Hengduan Mountains and East of China than to Intramongolica and Liaoning province in flora.

Key words: pteridophyte, floristic analysis, comparative analysis, Chongqing