北京百花山自然保护区地面生苔藓植物与生态环境的关系

运用典范对应分析法，定量分析了北京百花山自然保护区37个森林植被样地中33种主要地面生苔藓植物与生态环境之间的关系，结果表明：该区森林植被样地与环境因子的关系呈现多元化特点：相同植被聚为一组、环境因子相似的植被聚为一组、植被相同环境因子不同归为不同组和生境特殊的植被自成一组。得出该区多数地面生苔藓植物的分布与乔木郁闭度的相关性最大且与人为干扰程度密切相关，少数种类与草本层盖度和灌木盖度呈正相关。此外凋落物盖度、海拔、苔藓植物的生长基质也直接影响苔藓植物的分布。

Relationships between terrestrial bryophytes and eco-environmental factors in Baihua Mountain National Nature Reserve in Beijing

The method of Canonical Correspondence Analysis was used to analyzed the data of terrestrial bryophytes of 37 forest sites in Mt. Baihua. The relationships between the terrestrial bryophytes and the environmental variables were revealed in the biplots of CCA:same forests became a group,forests in similar environment get together,the same forest in different environment became a group and some forest in special environment gather a group. Bassed on the correlation coefficients of the environmental variables with the first two axes,the environmental variables that decided the distribution of the 33 bryophytes were canopy density,shrub coverage,altitude,base and human disturbance. CCA two-dimensional ordination diagram of 37 sites of forests-enviromental factors showed the diversities character between the sites and environmental variables.