毛柄小勾儿茶伴生群落种类组成及多样性研究

The Diversity of Plant Communities with Endangered Plant,Berchemiella wilsonii var. pubipetiolata

通过野外实地调查对小勾儿茶变种毛柄小勾儿茶（Berchemiella wilsonii var.pubipetiolata）伴生群落4个分布点（浙江省临安市湍口和马啸、安徽省霍山县马家河和舒城县万佛山）的种类组成及物种多样性进行研究.结後果表明：（1）种类丰富,但含多属或多种的大科、大属的优势地位不明显,极小科（仅含1属）、极小属（仅含1种）所占比例大;（2）属的北温带分布类型最多,科的世界分布类型比例大,仅次于泛热带分布类型;（3）4个分布群落乔木层、灌木层、草本层优势度均很低;灌木层Shannon-Wiener多样性指数较大,在4.13～4.49之间,乔木层和草本层较低.湍口、马家河、万佛山以灌木层Heip均匀度指数最大,马啸以乔木层均匀度指数最大;（4）马家河与万佛山之间的植物种类组成最相近,湍口与马啸也较相近;乔木层种类组成差异最大,灌木层最小.

The species composition and diversity of plant communities contributed with Berchemiella wilsonii var. pubipetiolata were studied in four locations （Tuankou and Maxiao villiage, Lin＇ an city, Zhejiang province, H uoshan and Shucheng county, Anhui province）. The results were as follows：（1） There were many similar characteristics in four locations as to statistics of families and genera. First, species were abundant. Second,there were few large families composed of more than 5 genera and few large genera composed of more than 5 species and these large families and genera had little dominant status. Third numerous families were the extreme one with only one genus and numerous genera were the extreme one with only one species. However, these large families and genera were different in four locations. （2） Characteristics of the flora. North temperate genera took the first place, followed by Endemic to Asia genus. Cosmopolitan families took the bigger share,just second to Pantropic families. Another attracting our attention was the fact that there were many Cosmopolitan genera in four locations. （3） Characteristics of a diversity.. First of all, the dominancy for all three layers （arbor,shrub and herb layer） in four locations was very low and their Simpson indexes were below 0. 08 , particularly lower value in shrub layers. Second, Shannon-Wiener indexes had bigger value,4.13-4.49 ,for shrub layer in all four locations than for arbor and herb layer. Tuankou had the bigest diversity for arbor layer and the lowest diversity for herb layer among the four locations. Next,from the Margalef index we had obtained the similar results with Shannon-Wiener index. Last, Tuankou, Huoshan and Shucheng had the biggest Heip indexes for shrub layer. Maxiao,however, had the biggest value for arbor layer. （4）t3 diversity indicated that there were the most similarity in species composition between Majiahe and Wanfoshan, the two located in Anhui Province. There were considerable similarity between Tuankou and Maxiao,the two in Zhejiang Province. In addition, there were the most similarity for shrub layer and the lest similarity for arbor layer.