SIMULATION AND ANALYSIS OF SOIL WATER CONTENT lN CHINESE FIR PLANTATION UNDER DIFFERENT MODES OF DISTURBANCE PLANT DIVERSITY OF PINUS KORAIENSIS FORESTS UNDER DISTURBANCE IN CHANGBAI MOUNTAINS OF CHINA THE RESEARCH AND DEVELOPMENT OF URBAN FORESTRY ANALYSIS OF THE PLANT FOR URBAN AFFORESTATION DYNAMICS OF SOIL WATER IN CHINESE FIR ECOSYSTEMS UNDER ARTIFICIAL DISTURBANCE SIMULATION OF RUNOFF DYNAMICS IN CHINESE FIR WATERSHEDS UNDER ARTIFICIAL DISTURBANCE INFLUENCES OF HUMAN DISTURBANCES ON VEGETATION OF SONGSHAN NATIONAL LEVEL NATURE RESERVE Progresses of Studies on Biodiversity of Urban Birds INFLUENCE OF FLOOD DISTURBANCE ON THE REGENERATION OF CYCLOBALANOPSIS GLAUCA POPULATIONS