STEM RESPIRATION AND ITS CONTROLLING FACTORS IN FOREST ECOSYSTEMS STEM RESPIRATION RATES OF DOMINANT TREE SPECIES IN A TROPICAL SEASONAL RAIN FOREST IN XISHUANGBANNA, YUNNAN, SOUTHWEST CHINA Effects of Grazing Intensity on Ecosystem Gas Exchange of Different Grassland Types in Inner Mongolia Research on Key Greenhouse Gas Fluxes across Alpine Steppe, Alpine Meadow and Swamp Meadow in Nam Co, Tibetan Plateau Respiration rates of stems at different heights and their sensitivity to temperature in two broad-leaved trees in Beijing Net ecosystem CO2 exchange and its environmental regulation mechanisms in a reed wetland in the Yellow River Delta of China during the growth season. Estimating Stem Respiration by Mass Balance Approach:Theory and Application Stem respiration of Pinus koraiensis in Changbai Mountains STUDY ON STEM RESPIRATION OF LARIX GMELINII OF DIFFERENT AGES AND ITS RELATIONSHIP TO ENVIRONMENTAL FACTORS