Species Diversity of Bryophytes in Main Forest Vegetations in Upper Reach of Chishui River Effect of grazing on community characteristics and species diversity of Stipa purpurea alpine grassland in Northern Tibet Effect of Tourism Disturbance Intensity on Plant Species Diversity of Meadow Community in Kanasi Nature Reserve Patterns and mechanisms influencing plant diversity in an arid desert region riparian zone of the Aqikesu River, Xinjiang, China Effect of Grazing Disturbance Gradient on Plant Diversity of Main Grassland Communities in the Songnen Plain of China STUDIES ON PLANT COMMUNITY DIVERSITY IN DONGLINGSHAN MOUNTAIN,BEIJING,CHINA Ⅸ.THE INFLUENCE OF SCALE ON α DIVERSITY The α diversity of shrubs community in the arid valley of the Minjiang River Elevational changes in species diversity and similarity analysis of a Rhododendron chrysanthum community on Changbai Mountain α diversity of communities and their variety along altitude gradient on northern slope of Changbai Mountain Study on Species Diversity of Subalpine Meadow Communities in Wolong Nature Reserve Study on the relationship between α diversity of plant community and environment on Dinghushan COMMUNITY CHARACTERISTICS OF STIPA PURPUREA STEPPE IN SOURCE REGIONS OF CHANGJIANG AND HUANGHE RIVERS, CHINA