镇雄县珙桐群落特征及种群更新研究

Characteristics of Community Structure of Davidia involucrata in Zhenxiong County

采用典型抽样法在镇雄县珙桐分布区设置11个样地,其中8个样地采用20 m×20 m样方法,3个样地采用实测法,样地总面积计1.6 hm^2,对珙桐群落进行野外调查,重点分析该地区珙桐群落的物种构成、区系特征及珙桐更新状况。结果表明,该地区珙桐群落植物种类十分丰富,共有蕨类植物6科7属8种,被子植物54科102属123种,且古老性、特有性强;群落被子植物的区系构成中以温带分布型为主,约占分布区类型的60.95%;珙桐群落中生活型以小型叶、高位芽植物为主,表明其生境较温暖湿润;珙桐群落径级结构呈现明显的倒金字塔形,表明种群更新较差,处于衰退阶段。

This paper conducted an investigation of Davidia involucrata community on 11 plots, a total of 1.6 hm2 in Zhenxiong County, of which 8 samples using 20m ×20m sampling method, 3 samples meas- ured by the feild method. The investigation focused on community species composition, floristic composi- tion, structure characteristics and regeneration of Davidia involuerata. The results showed that： Davidia involuerata community was rich in species, a total of 6 families of ferns belonging to 7 genera and 8 spe- cies, 54 families, 102 genera and 123 species of angiosperms with feature of ancient, unique and strong; the Angiosperm Flora community composed in temperate type, accounting for about 60.95% ; The struc- ture of the community of Davidia involucrata was dominated by small leaf and high bud plants, indicating that the habitat was warm and humid; the diameter structure of Davidia involuerata showed obvious in- verted pyramid shape, which indicated that the population was poorly renewed and in the recession stage.