Effect of different nitrogen fertilizers on N2O emission from soil CH4 and N2O emission from a winter-time flooded paddy field in a hilly area of Southwest China CO2 flux characteristics from degenerated mat cryo-sod soil during plant growing period N2O emission by plants and influence of fertilization A Study on CO2 Emission Rate from Alpine Meadow in the Source Region of Yellow River in Guo-luo, Qing-hai Province Effects of temperature on CH4 emission from subtropical common tree species leaves.