【摘要】 在对滇东北9个样地总面积4500 m2珙桐群落进行野外调查的基础上,重点分析该地区珙桐群落的物种构成、区系成分、结构特征、群落相似性及珙桐更新状况.结果表明:①该地区珙桐群落植物种类十分丰富,共有蕨类植物7科10属16种,被子植物63科110属171种,且古老性、特有性强;②群落被子植物的区系构成中以温带分布型属为主,约占57.27%,缺乏温带亚洲分布,中亚分布和地中海区、西亚至中亚分布3种类型;③与四川省都江堰、卧龙和甘肃省文县等地珙桐群落植物区系构成基本相似,但温带成分略为减少,热带成分相对较多;④群落垂直结构明显,珙桐与各散生竹类构成独特的乔、竹、草结构,依群落中灌木层优势竹种不同而划分为3个群丛;⑤珙桐径级分布呈现出稳定增长的金字塔型,表明该地区珙桐种群能保持较长时期稳定,但珙桐更新种群以萌枝为主,极少见实生苗,表现出种群衰退迹象,而且群落更新层中有大量其他树种幼苗,若珙桐遭到破坏,它们将有可能取代珙桐的优势地位.更多还原

【Abstract】 Based on field work in 9 sample plots of Davidia involucrata communities with total area of 4 500 m2 in Northeastern Yunnan,the study mainly analyzes the species composition,flora element,structure characteristics,similarity about community and species regeneration.The results show as following: ① The species of the community are very rich with prominent ancient and endemic characteristics.There totally are 16 species of Pteridophyte,belonging to 10 genera and 7 families,and 171 species of seed plants,to 110 genera and 63 families.② The flora composition of angiosperm is mainly temperate distribution type accounting for about 57.27%.③ The flora composition of the population is basically same as that in other provinces.④ The vertical structure of the community is obvious.⑤ The diameter class distribution of Davidia involucrata population presents stable growth like a pyramid.更多还原