Abstract: By using static chamber techniques, the N₂O emission from soils under different land use patterns was measured. The results showed that the N₂O flux ranged from -21 to 435 μg·m^-2·h^-1, and the annual N₂O flux was decreased in the order of vegetable field>orchard>upland>upland transferred from paddy field>woodland, being 447.14, 313.57, 167.00, 124.875 and 7.24 mg·m^-2, respectively. The N₂O flux presented significant seasonal fluctuation, with the maximum in spring and summer, followed by in autumn, and the minimum in winter, which was approximately consistent with the changes of air and soil temperature. N₂O flux had significant positive correlation with the soil temperature at 5 cm depth and soil NO₃-N content, but no significant correlation with soil moisture and NH₄⁺ -N contents.

Key words: flooding mode, incubation temperature, soil sterilization/non-sterilization, arsenic species.