Abstract:Climate warming and permafrost degradation will increase greenhouse gas emissions from the permafrost swamps. However, the fluxes of these trace gases have been scarcely quantified in cold temperate zone continuous permafrost region. The seasonal variation and the influence factors (temperature, water level, depth of thawing, and soil organic carbon and nitrogen content) of emission fluxes of greenhouse gas including CO2, CH4, and N2O from seven kinds of natural swamps (Carex schmidtii marsh-C, Betula ovalifolia-C. schmidtii shrub swamp-G, Alnus sibirica-C. schmidtii swamp-M, B. platyphylla-C. schmidtii swamp-B, Larix gmelinii-C. schmidtii swamp-LT, Larix gmelinii-moss swamp-LX, and Larix gmelinii-Sphagnum spp. swamp-LN) were studied over a one-year period by static chamber-GC technique in continuous permafrost region at the Daxing'an Mountains, northeast China. The results showed that: (1) the CO2 annual average emission flux (125.12-163.33 mg m-2 h-1) was similar. (2) CH4 annual average emission flux (-0.007-0.400 mg m-2 h-1) exhibited a different trend in C greater than that of others (5.6-65.7 times greater than the others, P<0.01). (3) N2O annual average emission flux (1.52-37.90 μg m-2 h-1) had significant differences among all the sites (M, B was 2.0-23.9 times higher than that of others, P<0.05, LT, LX and LN was 2.9-6.2 times greater than C and G, P<0.05); (4) The three greenhouse gases emissions from seven kinds of wetlands were controlled partly by soil temperature, water level, thaw depth, soil organic carbon and nitrogen content, carbon to nitrogen ratio, pH value, and water content. The CO2 emissions were mainly controlled by soil temperature, and that of B, LT, LX, and LN were also controlled by the water level. The CH4 emissions were mainly controlled by soil temperature and thaw depth. The N2O emissions were controlled partly by soil temperature, water level, thaw depth, soil organic carbon and nitrogen content, carbon to nitrogen ratio, pH value, and water content. Above environmental factors can explain the variation of soil N2O flux by 26%-99%. (5) The global warming potential (GWP) of the seven natural wetland soils were similar ranged in 11.05-15.37 t CO2 hm-2 a-1, which all were dominated by CO2. The C took CH4 as the secondary position and forested wetlands took N2O as the secondary position. Based on the results, it was found that these swamp soils in the permafrost region of Daxing'an Mountains are still in the low emission stage of CO2, CH4 and N2O.