Analysis on species diversity of plant community in Badaling area of Beiing,China

Based on the survey and the data from 34 plots,characteristics of species diversity of plant communities in the upper reaches of Badaling area were discussed in this paper.The study showed that richness index goes as follows: tree layerherb layershrub layer.Diversity indices in tree layer were lower than that in herb layer and in shrub layer.While the indices in herb layer and shrub layer varied with shade density of the stands,the greater the shade density,the lower the diversity indices in herb layer.When shade density of stand was about 53%,the indices of diversity and richness in herb layer were almost equal to that in shrub layer;when shade density of stand was about 25%,the indices in shrub layer were lower than that in herb layer;when shade density of stand was above 53%,the indices in herb layer were higher than that in shrub layer.Biodiversity indices in the plantation changed a lot,but they are far less than in natural forest.Forest regeneration is lack of shrub layer and ground cover plant,and the ecosystem is under a very unstable state.