珙桐的群落特征及种群生态学研究进展

Research Progress on Community Characteristics and Population Ecology of Davidia involucrate Baill

为了解国家一级保护植物珙桐(Davidia involucrata Baill)的生境现状,采用综合分析法对珙桐群落特征和种群生态学进行研究。结果发现:(1)珙桐群落的植物种类丰富,植物区系组成以东亚分布最多,其次是北温带,珙桐群落区系的温带成分所占比例大于热带成分,其种类组成具有亚热带向温带过渡的特征。(2)群落垂直结构可分为乔木层、灌木层、草本层和层间植物。乔木层及灌木层不发达,草本层较发达。群落根据Raunkiaer生活型谱划分以高位芽植物占优势,与其他亚热带常绿落叶林生活型谱各项比率相近似。(3)种群年龄结构及空间分布格局显示,珙桐群落未达到一个稳定状态,整个种群呈集群分布。(4)珙桐自然更新能力差,种子萌发率低,实生苗少,主要以萌芽更新为主。中国珙桐群落处于一个不稳定的濒危状态。

To know the habitat of Davidia involucrate,an endanged plants in China,using the comprehensive analysis method to analyze the community characteristics and population ecology of D.involucrate Baill.The results showed that：（1） there were plenty of plants in the community.The composition of D.involucrata community was that the east Asia plants was the largest.Next was North Temperate Zone.The component of species had the typical transition characteristics that from the subtropics to the temperate zone.（2） The community vertical structure was simple,which composed of tree layer,shrub layer,herb layer and interlayer plant.Herb layer was better than tree layer and shrub layer.In term of life form,phanerophytes were on the top,the composition of life form was similar to that in subtropical evergreen and deciduous forest.（3） According to the age structure.It ’ s indicated that D.involucrata community had not yet developed into its climax.And the spatial pattern of the whole population was of clumping distribution.（4） Natural regeneration ability of D.involucrata was weak and seed germination was low.The community of D.involucrate was in a state of instable and endanged.