百花山植物群落物种多样性研究

基于百花山50个样方的调查资料，从不同类型群落的物种多样性及其与海拔的关系等方面对百花山植被进行了分析，并且用DCA排序和海拔高程排序对物种多样性在环境梯度上的分布格局进行了初步研究。结果表明：群落内不同生长型的物种丰富度指数在森林群落中大小顺序为草本层＞灌木层＞乔木层，灌丛群落主要表现为草本层﹥灌木层，只有荆条灌丛表现为灌木层＞草本层；Shannon-Wiener指数在山杨—华北落叶松群落中表现为灌木层＞草本层＞乔木层,其他森林群落为草本层＞灌木层＞乔木层，在灌丛群落中主要表现为草本层＞灌木层，只有荆条灌丛表现为灌木层＞草本层；均匀度指数在灌丛群落中表现为灌木层＞草本层，在辽东栎林和山杨—华北落叶松林中表现为灌木层＞乔木层＞草本层,而其他森林群落表现为乔木层＞灌木层＞草本层。物种多样性在DCA第一轴排序和海拔高程梯度上都表现出单峰曲线变化趋势，但拟和效果的显著程度不同：丰富度和均匀度指数在海拔高程上曲线的拟和效果优于DCA环境梯度排序效果；而多样性指数则相反。

Species Diversity of Baihua Mountain Forest Plant Community

Based on data from 50 quadrates,species diversity of plant communities in Baihua mountains were discussed,and measurements of species diversity of quadrates along DCA axis 1 gradient and altitudinal gradient was also carried out.The results showed that:Richness index varied as follows:in forest communities it showed herb layer > shrub layer > tree layer,in shrub communities showed herb layer > shrub layer and Vitex negundo var.heterophylla community showed shrub layer > herb layer.Shannon-Wiener index of the most forest communities showed herb layer > shrub layer > tree layer but Populus davidiana Larix principis-rupprechtii community showed shrub layer > herb layer > tree layer,and that of shrub communities showed herb layer > shrub layer but Vitex negundo var.heterophylla community showed shrub layer > herb layer.Evenness index of shrub communities showed shrub layer> herb layer,in forest communities it showed tree layer > shrub layer> herb layer Quercus liaotungensis and Populus davidiana Larix principis-rupprechtii community showed shrub layer > tree layer > herb layer.The specie diversity of quadrates along both DCA axis 1 and altitudinal gradient significantly peaked at the intermediate elevations,but there were some differences:the fitted curves of both richness and evenness with altitudinal gradient were more significant than that fitted with DCA axis 1,while that of diversity showed the opposite trend.