THE EFFECTS OF DIFFERENT ARTIFICIAL DISTURBANCE ON THE FLORA AND SPECIES DIVERSITY OF TREE LAYER IN CASTANOPSIS CARLESIS FOREST IN WUPIN, FUJIAN Studies on the Biocycling of Nutrient Elements of Tree Layer of Cunninghamia lanceolata Mature Plantations STUDY ON THE TREE LAYER BIOMASS OF Picea koraiensis ARTIFICIAL FORESTS The Characteristics of Tree Layer Structure of the Rare Plant Community in Houhe Nature Reserve Changes in Soil Organic Carbon and Nitrogen Stocks in Pinus kesiya var. langbiannesis Plantation C, N, P stoichiometric characteristics of tree, shrub, herb leaves and litter in forest community of Shaanxi Province, China. Study on tree layer dynamic in Xishuangbanna montane rain forest based on 20 years‘ monitoring Analysis of Inter-Specific Correlation of Cephalcia kunyushanica and Tree Layer Plant Species in Natural Forests in Kunyushan Influence of Overstory on Seasonal Variability of Understory Herbs in Primary Broad-leaved Korean Pine Forest of Changbai Mountain