Comparision on Fine Root Production,Distribution and Turnover Between Plantations of Fokienia Hodginsii and Cunninghamia Lanceolata Allocation Pattern of Biomass and Productivity for Three Plantations of Castanopsis hystrix, Pinus massoniana and Their Mixture in South Subtropical Area of Guangxi, China Biomass and net productivity of Quercus variabilis forest in Baotianman Natural Reserve Research on the Net Productivity and Nutrient Accumulation of the Natural Forest of Populus cathayana ×P. simonii Above-Ground Biomass Production and Nutrient Cycling of Young Plantation of Eucalyptus urophylla STUDIES ON THE STAND NET PRODUCTIVITY AND BIOLOGICAL CYCLE OF NUTRIENT ELEMENTS IN THE 29-YEAROLD PLANTATIONS OF CHINESE FIR ON DIFFERENT ROTATIONS Plant Compensatory Growth in the Grazing System of Stipa breviflora Desert Steppe──Ⅰ. Plant Net Productivity NET PRODUCTIVITY AND TURNOVER RATE OF FINE ROOTS IN MIXED FOREST OF CUNNINGHAMIA LANCEOLATA AND TSOONGIODENDRON ODORUM A Study on the Productivity of Secondary Shrub Thicket and Shrub-Grassland in Yixian County,Anhui Province THE SOCIOLOGICAL CHARACTERISTICS AND BIOMASS OF STONE PINE FORESTS IN CHINA Belowground biomass and its relationship to environmental factors of natural grassland on the northern slopes of the Qilian Mountains