湘西南两江流域支流分流山地区维管束植物区系研究

Study on Vascular Plant Floristic Characteristics in the Southwest of Hunan Province

采用线路和标准地调查,对湘西南长江、珠江流域(两江流域)支流分流山地区的维管束植物进行分析研究,结果表明:①有野生维管束植物241科983属2638种,科、属、种数明显大于邻近同纬度和相近纬度地区,较大类群出现于蕨类植物和被子植物,特别是双子叶植物;②872个种子植物属分布于14个分布型27个变型中,R/T值为1.31,明显大于邻近同纬度区和相近纬度区;③有单种属59属,寡种属165属,单种属特有成分占35.59%,寡种属以14型、7型、9型、8型占优势;④珠江支流浔水区黔桂、华南植物区成分为其重要组成成分,有黔桂、华南典型成分为优势种的植物群落,沟谷分布有沟谷雨林,以板根、茎花、大型叶、复叶增多为其外貌特征,在长江支流渠水区这些黔桂、华南成分不见或少见,其群落和其外貌特征不出现;⑤分水岭牛皮界至传素山及其延伸区是通道境内华中区与黔桂区植物区的分界线。

Vascular plant floristic characteristics in the southwest of Hunan province were investigated by lines and standard quadrate.The results demonstrated that the wild vascular plants in this area are formed by 2438 species belonging to 241 families and 983 genera.Quantity of plant families,genera and species here was significantly greater than that near areas at similar latitudes.Large groups appear in ferns and angiosperms,especially dicotyledonous plants.872 seed plants genera can be divided into 14 distribution types and 27 variant ones,the R/T value is 1.31 and obviously larger than that of near areas at similar latitude.There are 59 single-species genera and 165 few-species genera.Endemic genera occupy 35.59% of the single-species genera.The few-species genera are dominated by type 14,7,9,8.The Guizhou-Guangxi flora,South China flora important component of Xunshui District of branch of the Zhujiang River tributary,and it as the dominant species of typical plant community composition,and distributed in valley is rain forest,and board the root,stem and flowers,large leaves,the leaf increase as their physical characteristics.The Guizhou-Guangxi flora,South China flora is missing or rare in Qushui District in the Yangtze River tributary,their communities and their physical characteristics do not appear.