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- W2115301597 abstract "In temperate climates, up to ∼50–70% of the total annual nitrous oxide (N 2 O) flux occurs in winter, which is mainly attributed to freezing‐thawing processes of frozen soils. To investigate the nature of the enhanced N 2 O emission in winter, we monitored gas fluxes at two plots of freshwater marshes in northeastern China (47°35′N, 133°31′E), using a static chamber method at weekly to monthly intervals from 2002 to 2004. The results show that the big emission burst of N 2 O coupled with peak emission of CH 4 occurred in late July to early August, which is about 1 week after the soil thawed out completely. Further observations show that the N 2 O and CH 4 were continuously produced underneath the frozen soil. The gas‐producing layer was continuously depressed downward during the progressive freezing. The highest concentrations of N 2 O and CH 4 were first observed when the frozen layer reached its maximum depth of ∼90 cm in early February and remained there with roughly constant concentrations until June. We propose that at the beginning the frozen soil limits the transportation of oxygen from atmosphere to soil, while freezing increases the nutrient supplies, producing an anoxic organic‐rich environment underneath the frozen layer, which promotes the net formation of N 2 O and CH 4 through denitrification and anoxic digestion of organic matters, respectively. In contrast, after the frozen layer reached the organic‐poor gley layer and there is no further supply of nutrients through freezing, the formation of N 2 O and CH 4 stopped shortly after." @default.
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- W2115301597 date "2007-04-14" @default.
- W2115301597 modified "2023-10-15" @default.
- W2115301597 title "Enhanced net formations of nitrous oxide and methane underneath the frozen soil in Sanjiang wetland, northeastern China" @default.
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- W2115301597 doi "https://doi.org/10.1029/2006jd008025" @default.
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