EFFECTS OF LINEAR AND EXPONENTIAL FITTING ON THE INITIAL RATE OF CHANGE IN CO2 CONCENTRATION ACROSS THE SOIL SURFACE COMPARISONS BETWEEN SEASONAL AND DIURNAL PATTERNS OF SOIL RESPIRATION IN A MONTANE EVERGREEN BROAD-LEAVED FOREST OF AILAO MOUNTAINS, CHINA Atomosphere CO2 Concentration and Its Variation Characters Above Inner Mongolia Grassland In Grass Growing Season Soil N2O and CH4 fluxes in broad-leaved Korean pine forest of Changbai Mountains