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Environmental factors affecting plant species diversity of understory plant communities in a Castanopsis hystrix plantation chronosequence in Pingxiang, Guangxi, China Factors affecting natural regeneration of Larix principis-rupprechtii plantations in Saihanba of Hebei, China Spatial Distribution of Tree Species and Environmental Interpretations of Secondary Forest in Changbai Mountains Sex ratio and spatial pattern in Populus davidiana in Changbai Mountain Classification and Ordination of Picea wilsonii Forests in the Luya Mountain Nature Reserve INFLUENCE OF ECOLOGICAL FACTORS ON DISTRIBUTION OF WOODY PLANT FUNCTIONAL TYPES IN A NATURAL TROPICAL FOREST LANDSCAPE, BAWANGLING,HAINAN ISLAND,SOUTH CHINA The relationships between microhabitat heterogeneity and the spatial distribution of Dacrydium pectinatum in Bawangling, Hainan Island