广西苦苣苔科植物区系和生态特点研究

Studies of the Flora and Ecology Gesneriaceae in Guangxi Province

滇黔桂及其邻近地区是我国苦苣苔科植物的分布和特有中心 ,广西正处于这个中心的位置上 ,种类十分丰富 ,共计有 38属、 16 6种 (含种下等级 ,下同 ) ,属和种的分布区类型不太复杂 ,特有现象极为突出 ,其中仅产广西的特有属有 5个 ,特有种达 81个。广西苦苣苔科植物区系与相邻的贵州、云南两省属的相似性系数较高 ,分别为 75 76 %和 71 4 2 % ,但与相邻省份苦苣苔科植物种的相似性系数却较低 ,从 35 4 8%至 6 4 9%不等。苦苣苔科植物在广西全境分布较广泛 ,但各地种类分布很不均衡。广西苦苣苔科植物的天然分布对基质有较严格的专一性 ,种群植株数量一般较少 ,同一种类不同的居群间形态变异较大。

Yunnan-Guizhou-Guangxi and some of their neighbouring areas formed a distributional and endemic center of Gesneriaceae during its evolutionary process in China.Among 38 genera and 166 species being bound in Guangxi,there are 5 genera and 81 species belonging to endemism.By comparison of the genera with those of the neighbouring areas,the generic similarity coefficient of Guangxi to Guizhou and Yunnan reaches to 75.76% and 71.42% respectively,but to the other neighbouring provinces only reaches to a lower rangs from 35.48% to 6.49%.As the taxa require a strict bed rock to live,they distribute in Guangxi unevenly.The individuals of each species are always fewer and present larger interpopulation variation.