东莞市银瓶嘴自然保护区苏铁蕨群落特征

苏铁蕨Brainea insignis属于国家Ⅱ级重点保护植物．在银瓶嘴自然保护区1600m^2样方中有维管植物60科88属99种．种子植物区系以热带分布区类型为主，占83．95％．群落可分为乔木层、灌木层、草本层和层间层．乔木层鼠刺Itea chinensis的重要值最大，为35．05％；灌木层中苏铁蕨的重要值最大，为38．61％．说明苏铁蕨在群落中占有重要地位．

The Characteristic of Community with Brainea insignis in Yinpingzui Natrue Reserve, Dongguan

Brainea insignis is one of the fern species belonging to the second class national key protected plants.According to the investigations in 16 sample plots totaling(1 600 m~2) in Yinpingzui Nature Reserve of Dongguan City,the communities consist of 99 species,88 genera,60 families of vascular plants.Analysis of floristic geographical elements showed that the percentage of tropical elements is high,accounting for 83.95% of the total numbers of genera.The community can be structurally divided into arborous layer,shrub layer and herbaceous layer.In the arborous layer Itea chinensis,with an importance value of 35.05%,is the biggest,and in the shrub layer the biggest one is Brainea insignis with an IV of(38.61%).It was suggested that Brainea insignis played an importanst role in the community.