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A STUDY ON LONG TERM SOIL EROSION MONITORING IN NEWLY ESTABLISHED HIGH-YIELDING TIMBER PLANTATIONS OF MAIN SPECIES IN CHINA A COMPREHENSIVE ANALYSIS ON FIXED FOREST PEST AND DISEASES, MONITORING FINDINGS IN NEWLY ESTABLISHED HIGH-YIELDING TIMBER PLANATATIONS OF MAIN SPECIES The Relationship between Different Amounts of Irrigation and Changes of Soil Water Content in Populus×xiaozhuanica cv.‘popularis’ Plantation in Arid Area in lnner Mongolia A STUDY ON LONGTERM SOIL FERTILITY MONITORING FINDINGS IN NEWLY ESTABLISHED HIGHYIELD TIMBER PLANTATIONS OF MAIN SPECIES Study on the Initial Planting Density of Industrial Timber Stands of Slash Pine and Loblolly Pine