贵州梵净山森林树干附生尖叶拟船叶藓分布格局研究

通过使用双向指示种分析（TWINSPAN）和无偏对应分析（DCA）两种方法进行研究的结果表明，梵净山树干附生尖叶拟船叶藓在群落水平上的分布与森林群落类型相对应，其所在群落可以分成贵州青冈-箭竹群落、贵州青冈＋巴东栎＋雷公鹅耳枥-箭竹群落、贵州青冈-短柱柃群落、大钟杜鹃＋多脉青冈-野八角群落、亮叶水青冈＋多脉青冈＋贵州青冈-箭竹群落和贵州青冈-尖叶山茶-野八角群落6类树附生苔藓植物群落类型。尖叶拟船叶藓在梵净山的垂直分布范围为海拔1650～2080m；在树干垂直分布表现为下部显著多于中部，中部显著多于上部；在不同树种间的分布存在显著差异。分析了影响树附生尖叶拟船叶藓生态分布的相关因素。

A Study on Distribution Pattern of An Epiphytic Bryophyte, Dolichomitriopsis diversiformis (Lembophyllaceae)on Tree Trunks in Forest in Fanjing Mountain of Guizhou

The distribution pattern of Dolichomitriopsis diversiformis (Mitt.)Nog.in Fanjing Mountain of Guizhou was investigated by means of TWINSPAN and DCA.The results showed that the community-wide distribution of epiphytic D.diversiformis is well correlated with forest community types.The forest communities with this species can be divided into six groups,which are Cyclobalanopsis stewardiana-Sinarundinaria nitida community,Cyclobalanopsis stewardiana+Quercus engleriana+Carpinus viminea-Sinarundinaria nitida community,Cyclobalanopsis stewardiana-Euryia brevistyla community,Rhododendron ririei+Cyclobalanopsis multinervis-Illicium simonsii community,Fagus lucida+Cyclobalanopsis multinervis+Cyclobalanopsis stewardiana-Sinarundinaria nitida community and Cyclobalanopsis stewardiana-Camellia cuspidata-Illicium simonsii community respectively.The vertical distributive range of this species is 1 650-2 080?m above sea level;the vertical distribution of this species on tree trunks is that on the lower parts are significantly more than on the middle parts and on the middle parts are significantly more than on the upper parts;the distribution of this species among different tree species is remarkably different.The ecological factors of influencing the distribution of epiphytic D.diversiformis in Fanjing Mountain were also analyzed and discussed.