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EFFECT OF DIFFERENT GROUND CLEARANCE ON CHINESE FIR PLANTATION ECOSYSTEMS STUDY ON THE FOREST LAND CLEARANCE WAYS OF EUCALYPTUS GRANDIS×E.UROPHYLLA SECOND-GENERATION SPROUT REGENERATION STAND STUDIES ON THE LAW OF THE SOIL AND WATER LOSSES IN THE CULTURAL LAND OF CHINESE FIR Effects of different ground clearance on soil fertility of Chinese fir stands THE EFFECTS OF DIFFERENT CLEARANCES ON SOIL FERTILITY OF CHINESE FIR TIMBER PLANTATION