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湖北鳞毛蕨属植物的地理分布及区系特征

Studies on the Geographical Distribution and Floristic Characteristics of the Genus of Dryopteris Adanson from Hubei,China

  • 摘要: 对湖北鳞毛蕨属植物的地理分布和区系特点进行了研究。鳞毛蕨属植物广布于世界各地,该属的分布和多样性中心位于中国西南部和东喜马拉雅山区;另一中心则位于日本,中国东南部和南部。鳞毛蕨属是一个自然的北温带分布属。中国有鳞毛蕨属植物134种(包括7变种),西南地区(云南、四川、贵州等)是国产鳞毛蕨属植物分布最集中的地区。

     

    Abstract: This paper deals with the geographical distribution and the floristic characteristics of the genus of Dryopter is from Hubei Province of China.Dryopteris is commonly distributed in the world.One center of distribution and diversity is in southwest China and the east Himalayan,another in Japan,southeast and south China.Dryopteris is a very natural northern temperate genus.In China,including 134 species (7 varieties),more than 80% of Dryopteris are distributed in southwest China (i.e.Yunnan,Sichuan,and Guizhou).Floristic analysis indicates that,there are 36 species of Dryopteris in Hubei,which account for 26.87% of all the species of this genus in China.They are mainly distributed in the northwest and southwest of Hubei.Dryopteris is one of the main components of the herb layer in the forests of Hubei.In Hubei the geographical elements of the species are complex.Among them,both Sino-Japan and Chinese endemic elements are dominant,which account for 37.84% and 30.56% of all the species of this genus,respectively.The floristic characteristics of the east of Hubei differ greatly from those of the west.Namely, east Hubei belongs to east-China flora,which shows the characteristics of the transition from warm temperate zones to subtropical zones.West Hubei belongs to the central China flora,which is abundant in species,and is closely related to the southwest China flora.The flora of Dryopteris in Hubei is closely related to its neighbor regions including Sichuan,Yunnan,Guizhou,Jiangxi and Zhejiang.And the similarity coefficients are 77.78%,70.27%,67.57%,62.16%,and 62.16%,respectively.The floristic characteristics show distinct transitional nature.It acts as a link flora between east-China flora and central China-flora.

     

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