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Application of self-organizing map to quantitative analysis of mountain meadow in the Songshan Nature Reserve of Beijing, China Evaluation of Tree Health in Songshan Park, Macao Community characteristics of main vegetation types along two altitudinal transects on mountains of northwestern Beijing, China Rats Community Structure and Diversity in the Songshan National Nature Reserve, Beijing Spatial structure of Quercus mongolica forest in Beijing Songshan Mountain Nature Reserve. Species diversity of forest communities and its forecasting by neural network in the Songshan National Nature Reserve, Beijing Flora of the Woody Plants in Songshan Mountain National Forest Park of Henan Province Biodiversity and Conservation of Orchids in Songshan National Nature Reserve,Beijing Numerical classification and ordination of forest communities in the Songshan National Nature Reserve Impacts of tourist activities on components, properties and heavy metal pollution of soils in the Songshan scenic area INFLUENCES OF HUMAN DISTURBANCES ON VEGETATION OF SONGSHAN NATIONAL LEVEL NATURE RESERVE