浙江高姥山金缕梅群落特征及种群结构的研究

Community Characteristics and Population Structure of Hamamelis mollis Communities in Gaomu Mountain

在全面踏查的基础上,于2016年7月对浙江高姥山金缕梅Hamamelis mollis群落结构特征以及金缕梅种群结构进行调查研究。研究表明,群落中以金缕梅和四照花Dendrobenthamia japonica var. chinensis为主要优势种,其重要值分别为20.126%和17.737%,两者的重要值比例为37.863%;乔木层的物种丰富度指数最高,灌木层的物种均匀度指数最高,而乔木层、灌木层和草本层的优势度指数均较高且极为接近,说明该群落为相对不成熟群落;群落的乔木层高度主要集中在5～6 m。群落中金缕梅的高度虽然并不占优势,但通过根出条萌枝扩大冠幅,从而争夺群落资源;由于萌枝作为其主要更新方式,金缕梅种群整体呈聚集分布。金缕梅种群的大小结构以III级小树和IV级中树为主,由此认为该种群目前尚处于稳定阶段。

Sample plots were established in July 2016 in 4 Hamamelis mollis communities in Gaomu Mountain of Pan’an country, Zhejiang province. Community characteristics and population structure was studied. The results showed that the dominant species in the communities were H. mollis and Dendrobenthamia japonica var. chinensis, with importance value of 20.126% and 17.737% respectively. Species richness index was the highest at arbor layer and evenness index at shrub layer, and dominance index of each layer was similar. Distribution of arbor layer height in the communities was concentrated in 5-6 m. Investigation demonstrated that H. mollis was not dominant in height in the community, but it had larger canopy by root sprouts. Population of H. mollis was aggregated distribution in the communities. Population structure was dominant in small- and medium-sized H. mollis, indicating stable population.