【摘要】 利用分形理论中的计盒维数探讨了重庆市涪陵磨盘沟桫椤种群的分形特征。结果表明,桫椤种群的分布格局具有分形特征。桫椤种群在不同海拔高度分布格局的计盒维数各不相同,与生境密切相关。在6个不同植物群落中,桫椤种群的计盒维数大小依次为黄牛奶树淡竹叶>黄杞水麻>盐肤木腹水草>血桐芒>白栎扁穗莎草>毛叶木姜子火炭木。计盒维数定量地反映了该自然保护区桫椤种群占据生态空间的能力,随机型的桫椤种群对空间占有能力比聚集型的低。更多还原

【Abstract】 Using box dimension of fractal theory,the fractal properties of spatial pattern of Alsophila spinulosa population in Mopangou,Fuling were studied.The results showed that distribution pattern of Alsophila spinulosa population possessed fractal properties.At different altitudes,the box dimension of the horizontal distribution patterns of Alsophila spinulosa populations was different,which closely related to the environmental factors.The box-counting dimensions of Alsophila spinulosa population in six community-types was in order of Symplocos laurina-Lophatherum gracile> Engelhardtia roxburghiana-Debregeasia edulis > Rhus chinensis-Veronicastrum slenostachyum> Macaranga tanarius-Miscanthus sinensis > Quercus fabri-Cyperus compressus>Litsea mollis-Polygonum chinensis.The box dimension reflected the spatial occupation degree of the population.The box dimension of the clumped population was higher than that of the random population.更多还原