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INFLUENCE OF ECOLOGICAL FACTORS ON DISTRIBUTION OF WOODY PLANT FUNCTIONAL TYPES IN A NATURAL TROPICAL FOREST LANDSCAPE, BAWANGLING,HAINAN ISLAND,SOUTH CHINA 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 Classification and Ordination of Picea wilsonii Forests in the Luya Mountain Nature Reserve Sex ratio and spatial pattern in Populus davidiana in Changbai Mountain