Abstract: The soil N₂O emission fluxes in the two plots of broad-leaved Korean pine forest were measured by static closed chamber-gas chromatograph in Changbai Mountain.The results showed that litter increased N₂O emission flux of the forest soil by 36.89%.Broad-leaved & Korean pine forest soil of Changbai Mountain was an important source of atmospheric N₂O .But in exceptional weather,it was the sink by absorbing N₂O in the atmosphere.The N₂O emission flux of the forest soil ranged from -41.48 to 291.84μg·m^-2·h^-1,with the mean of 68.7μg·m^-2·h^-1,which was much higher than other types of forest.Furthermore,its variation range was also broader.The N₂O emission flux range of the litter-free soil was from -23.24 to 93.75μg·m^-2·h^-1,with an average of 33.79μg·m^-2·h^-1.The two plots showed similar seasonal variations with the highest emission flux in Spring,the higher in Summer and the lower in Autumn and Winter.The diurnal variation was also similar: The maxima of the two plots both occurred at 18 O'clock,and the minima appeared at 12 O'clock and 14 O′,clock.The results also indicated that N₂O emission flux of the forest soil was positively correlated to soil temperatures at 0 cm and 5 cm depth,while N₂O emission flux of the litter-free soil only had relation with the soil temperature at 5 cm depth.

Key words: Solid phase microextraction, Liriomyza sativae, Volatile organic compounds, Field trapping trials