大青沟国家自然保护区地面苔藓植物分布格局

用双向指示种分析（TWINSPAN）、除趋势对应分析（DCA）和典范对应分析（CCA）研究了大青沟国家自然保护区32个样地36种地面生苔藓植物分布格局。TWINSPAN和DCA分析结果显示，地面生苔藓植物群落可以分成双色真藓（Bryum bicolor）-小石藓（Weissia controversa）群落、西伯利亚瘤冠苔（Mannia sibirica）+小石藓（Weissia controversa）群落、密叶绢藓短柄变种（Entodon compressus var.zikaiwiensis）-密叶绢藓（Entodon compressus）+反扭藓（Timmiella anomala）群落、绒叶青藓（Brachythecium velutinum）-鳞叶藓（Taxiphyllum taxirameum）+尖叶匐灯藓（Plagiomnium cuspidatum）群落和地钱（Marchantia polymorpha）+曲肋薄网藓（Leptodictyum humile）-鳞叶藓（Taxiphyllum taxirameum）-柳叶藓（Amblystegium serpens）+平肋提灯藓（Mnium laevinerve）群落5组，对应分布在羊草（Leymus chinensis）草地、西伯利亚杏（Prunus sibirica）灌丛、大果榆（Ulmus macrocarpa）林、蒙古栎（Quercus mongolica）林和水曲柳（Fraxinus mandschuria）林。CCA分析结果显示，影响苔藓植物分布的主要因子有土壤水分、乔木盖度、空气湿度、凋落物盖度、草本层盖度等。

Distribution Patterns of Ground Bryophytes in the Daqinggou National Nature Reserve,Inner Mongolia,China

Two-way indicator species analysis (TWINSPAN), Detrended correspondence analysis (DCA) and Canonical correspondence analysis (CCA) were used to study distribution patterns of 36 species of ground bryophytes in 32 sites in Daqinggou National Nature Reserve, TWINSPAN and DCA results showed that the ground bryophyte communities of Daqinggou National Nature Reserve could be divided into 6 groups of Bryum bicolor-Weissia controversa community, Mannia sibirica+Weissia controversa community, Entodon compressus var.zikaiwiensis-Entodon compressus+Timmiella anomala community, Brachythecium velutinum-Taxiphyllum taxirameum+Plagiomnium cuspidatum community and Marchantia polymorpha+Leptodictyum humile-Taxiphyllum taxirameum-Amblystegium serpens+Mnium laevinerve community, which are individually distributed in Leymus chinensis community, Prunus sibirica shrub, Ulmus macrocarpa forest, Quercus mongolica forest and Fraxinus mandschuria forest. CCA results showed that major environmental variables influencing the distribution patterns of species of ground bryophytes and plots were canopy coverage, soil water content, air humidity, litter coverage, herb coverage et al.