A preliminary study on carbon dioxide, methane and nitrous oxide fluxes from intertidal flat wetlands of the Yellow River estuary

Abstract

Abstract: The diurnal variation characteristics of carbon dioxide (CO₂), methane (CH₄) and nitrous oxide (N₂O) fluxes from intertidal flat wetland of the Yellow River estuary were observed in situ with a static-chamber and GC in August 2009. CO₂, CH₄ and N₂O fluxes from the low tidal flat sediment showed an obvious diurnal variation. The flux ranges were from -18.754 6 to 43.730 8, -0.069 8 to 0.224 2 and -0.001 6 to 0.008 3 mg/(m²·h), and the daily average fluxes were 11.629 7, 0.078 7 and 0.004 6 mg/(m²·h), respectively, which showed that the low tidal flat sediment was the source of atmospheric CO₂, CH₄ and N₂O. The flux ranges of CO₂, CH₄ and N₂O in the middle tidal flat sediment were from -30.779 9 to 25.734 2, -0.111 3 to 0.1001 and -0.004 4 to 0.006 3 mg/(m²·h), and the daily average fluxes were 4.569 9, 0.011 3 and 0.002 3 mg/(m²·h), respectively, which showed that the middle tidal flat sediment was also the source of atmospheric CO₂, CH₄ and N₂O. The flux ranges of CO₂, CH₄ and N₂O in the high tidal flat were from 46.253 3 to 102.637 4, -0.210 9 to 0.047 5 and -0.008 3 to 0.007 8 mg/(m²·h), and the daily average fluxes were 76.656 1, -0.037 9 and -0.002 0 mg/(m²·h), respectively, which showed that the high tidal flat was not only the source of atmospheric CO₂ but also a sink for atmospheric CH₄ and N₂O. Further analysis showed that CO₂ flux from the middle tidal flat sediment was significantly positively correlated with atmospheric temperatures (P＜0.05), as was the CH₄ flux from the low tidal flat sediment (0 and 5 cm ground temperatures (P＜0.01)), but the N₂O flux from the middle tidal flat sediment was significantly negatively correlated with atmospheric temperatures and different depths of ground temperatures (5, 10 and 20 cm) (P＜0.05 or 0.01). In addition, sediment solvent and the Suaeda salsa community were the main factors affecting the flux characteristics of CO₂, CH₄ and N₂O, while soil water content and salinity also affected them.

CLC Number:

S151.9⁺3

WANG Ling-ling, SUN Zhi-gao, MOU Xiao-jie, SUN Wan-long, SONG Hong-li, JIANG Huan-huan. A preliminary study on carbon dioxide, methane and nitrous oxide fluxes from intertidal flat wetlands of the Yellow River estuary[J]. Acta Prataculturae Sinica, 2011, 20(3): 51-61.

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