The N₂O and CH₄ emission fluxes from abandoned land and artificial poplar forest in aquic brown soil were measured by static closed chamber-gas chromatograph (GC) technique from Oct. 2003 to Oct. 2004. The soil temperature, soil moisture, soil content of NO₃^--N and NH₄⁺-N were observed at the same time. The results showed that abandoned land was the source of atmospheric CH₄, on the other hand, artificial poplar forest was the sink of CH₄. During the observation period, the N₂O emission flux in artificial forest was higher than that in abandoned land. There was a remarkable negative correlation between CH₄ and N₂O emission in artificial forest, but it was not evident in abandoned land. It also showed that N₂O emission flux changed with the temperature variation. When the soil moisture was higher than 200g/kg, there was a significant correlation between soil moisture and the emission of CH₄ in the study fields.