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STUDY ON GROWTH PROCESS CHARACTERISTICS OF CHINESE FIR UNDER THE PATTERNS OF RESERVING BROAD-LEAVED TREES IN CHINESE FIR PLANTATION THE DROUGHT RESISTANCE OF FOUR BROAD-LEAVED SPECIES IN THE NORTH OF CHINA WITH PV TECHNIQUE THE SELECTION OF EXCELLENT BROAD-LEAVED TIMBER SPECIES IN FUJIAN PROVINCE Comparative study on seasonal changes in physiological characteristics of Eucalyptus, broad-leaved and coniferous tree species