普洱松山自然保护区旱冬瓜群落特征研究

Study on Community Characteristics of Alnus nepalensis in Pu'er Songshan Nature Reserve

根据野外典型样方调查结果,以群落植物区系特征、层次结构特征、种群大小级结构以及物种多样性几项指标,分析松山自然保护区旱冬瓜群落特征.结果表明:该群落植物种类丰富,地理成分复杂,主要由热带和温带区系成分组成,并具有明显的过渡性特征.群落层次分明,有乔木、灌木和草本3个层次,其中,乔木层、草本层分别形成以旱冬瓜、紫茎泽兰占绝对优势的单优种群.群落层间植物及蕨类植物甚少.旱冬瓜群落物种多样性由高到低依次为灌木层、草本层、乔木层.群落中旱冬瓜天然更新缺乏,处于生长衰退期,在群落中处于很不稳定的地位.

Based on field investigation of typical samples, the community characteristics of Alnus nepalensis in Songshan nature reserve were analyzed. The results showed that the composition of the flora was abundant and geographic elements were complex, the tropical and temperate floristic elements occupied a certain proportion with especial transitional character. The community was divided into three distinct layers, namely arbor, shrub and her layers. Among them arbor layer and herb layer were formed a dominant single-priority species by Alnus nepalensis and Eupatorium coelestrium. The plants of interlayer and pteri- dophyte were few. The species diversity of Alnus nepalensis community was shrub layer 〉 herb layer 〉 arbor layer in order. In the community, Alnus nepalensis was at the period of declining with little natural regeneration, so it was at very unstable position.