DIFFERENTIATION OF JUVENILE WOOD ZONE AND EFFECT OF TREE GROWTH RATE ON INCREMENT OF THE JUVENILE WOOD Study on Genetic Variation of Tracheid Microfibril Angle of Japanese Larch Clones The Changes of Nutrient Content and It’s Effect on Forest Growth on the Soil Degraded by Successive Crop of Japanese Larch Endogenous Hormones,Nutritive Material and Phenolic Acid Variation in Cuttings of Japanese Larch During Rooting Genetic Var ia tion ofWood Properties of Japanese Larch Clones ESTABLISHMENNT AND APPLICATION OF DENSITY CONTROL DIAGRAM OF JAPANESE LARCH STAND A ANALYSIS OF EFFECT OF JAPANESE LARCH INTRODUCTION IN SOUTH OF TAIHANG MOUNTAINS IN SHANXI PROVINCE