Seasonal variation of greenhouse gas emission fluxes from soils of Eucalyptus urophylla × Eucalyptus grandis and Acacia mangium plantations in South China

To study the seasonal variation and the influence factors of fluxes of greenhouse gas（CO2,N2O,and CH4）emissions from the soils of a Eucalyptus urophylla×Eucalyptus grandis plantation and an Acacia mangium plantation,we conducted 1 year of continuous monitoring of the greenhouse gas fluxes from the two types of forest using a static chamber and gas chromatography.We found that the soil of both the E.urophylla×E.grandis plantation and the A.mangium plantation behaved as CO2 and N2O sources and CH4 sinks.The N2O emission fluxes from the A.mangium plantation soil were significantly higher（P