Techniques for the Seedling Culture of Ulmus laciniata Studies on Type Classification and Tree Species Diversity for the Castanopsis fargesii Secondary Forest in the Hongdong Forest Farm of Fujian Province Studies on the Suitable Plantation Evaluation of Saline Land in the “Three Norths” Area The Characteristics of Tree Layer Structure of the Rare Plant Community in Houhe Nature Reserve The Evaluation and Selection of Fast-Growing Indigenous Broad Leaved Tree Species in South China Effects of tree species on polysaccharides content of epiphytic Dendrobium officinale