STUDY ON THE PROBLEMS OF FOREST PLANTATION PRODUCTIVITY OF CHINA Ⅱ.——TO PROBE INTO THE SOCIAL AND OTHER NON-NATURE FACTORS DEBASING THE PLANTATION PRODUCTIVITY APPROACHING TO THE DEVELOPMENT OF PLANTED FORESTS AND ESTABLISHMENT OF FOREST PLANTATION INDUSTRY STUDY ON RATIONAL CUTTING AGE OF BUILDING TIMBER OF MASSON PINE PLANTATION IN GUIZHOU PROVINCE Bioproductivity of Various Tree and Shrub Plantations in the Loess Region, Northwestern Shanxi Comparison of Community Structures and Species Diversity in Natural Forests and Forest Plantation of Pinus yunnanensis Net carbon exchange and its environmental affecting factors in a forest plantation in Badaling, Beijing of China. Soil aggregate stability and soil organic carbon characteristics in Quercus variabilis and Pinus tabulaeformis plantations in Beijing area. Study on the Present Condition and the Potentialities of the Productivity of Main Tree Species Forest Plantation of ChinaⅠ.Study on the Forest Plantation Productivities of Cunninghamia lanceolata and Pinus massoniana Study on Change Laws of Biomass and Productivity of Masson Pine Forest Plantation Ⅱ.Biomass and Productivity of Stand at Different Ages The Relation of Species Diversity to Pest Control in Forest Plantations Tree Layer Biomass Distribution and Carbon Storage Capacity of Larix olgensis Plantation Soil soluble organic matter, microbial biomass, and enzyme activities in forest plantations in degraded red soil region of Jiangxi Province, China. Effects of microbial agents on litter decomposition in urban protective greenbelts of arid zone. Effects of different type urban forest plantations on soil fertility. Species Diversity in Undergrowth of Artificial Forests on Lower Hilly Land QUANTITATIVE STUDY ON THE SOIL WATER DYNAMICS OF VARIOUS FOREST PLANTATIONS IN THE LOESS PLATEAU REGION IN NORTHWESTERN SHANXI Variation of Soil Carbons and Fertilities in Larch Plantation Land, Clear-Cut Site and Farmland in NE China