Effects of Tfree Age,Felling system on the sprout Regeneration of Acacia auriculitormis Effects of Cutting Season, Stump Diameter and Cutting Tool on the Sprout Regeneration of Acacia auriculiformis STUDY ON THE EFFECT OF STUMP DIAMETER AND HEIGHT ON SPROUT REGENERATION IN MANGIUM (ACACIA MANGIUM WILLD.) STUDY ON THE FOREST LAND CLEARANCE WAYS OF EUCALYPTUS GRANDIS×E.UROPHYLLA SECOND-GENERATION SPROUT REGENERATION STAND A Study on the Density Control of Second-generation Eucalyptus grandis × E. urophylla Stand by Sprout Regeneration Effects of Rotation Length and Repeated Harvesting on the Sprouting Reproduction of Acacia auriculiformis