LAUSR

Carbon (CO2 and CH4) emission fluxes, annual net carbon sequestration of vegetation, were studied from seven kinds of natural wetlands ( 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⁃L⁃T, L. gmelinii⁃moss swamp⁃ L⁃X, and L. gmelinii⁃Sphagnum spp. swamp⁃L⁃N) in Xiaoxing′ anling region of China using the static chamber gas chromatography method and the relative growth equation method to evaluate the carbon source or sink of natural forested wetlands based on net ecosystem carbon balance. The results showed that: 1) seasonal dynamics of CH4 emission fluxes from seven kinds of natural wetlands could be divided into three types ( single⁃peak, multi⁃peak, and emission and absorption alternating type) and CH4 emission flux (0.006—7.756 mg m -2 h) exhibited a different trend in M (which was 1.0—1291.7 times greater than the others, P < 0.05) >C, G, B (17.7—649.0 times greater than L⁃T, L⁃X, and L⁃N; P> 0.05) >L⁃T, L⁃X, and L⁃N; 2)seasonal dynamics of CO2 emission fluxes from the seven kinds of natural wetlands could be