Item talk:Q237217
From geokb
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"name": "Effects of permafrost thaw on CO2 and CH4 exchange in a western Alaska peatland chronosequence",
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"abstract": "Permafrost soils store over half of global soil carbon (C), and northern frozen peatlands store about 10% of global permafrost C. With thaw, inundation of high latitude lowland peatlands typically increases the surface-atmosphere flux of methane (CH4), a potent greenhouse gas. To examine the effects of lowland permafrost thaw over millennial timescales, we measured carbon dioxide (CO2) and CH4\u00a0exchange along sites that constitute a ~1000 yr thaw chronosequence of thermokarst collapse bogs and adjacent fen locations at Innoko Flats Wildlife Refuge in western Alaska. Peak CH4exchange in July (123\u00a0\u00b1\u00a071 mg CH4\u2013C m\u22122\u00a0d\u22121) was observed in features that have been thawed for 30 to 70 (<100) yr, where soils were warmer than at more recently thawed sites (14 to 21 yr; emitting 1.37\u00a0\u00b1\u00a00.67 mg CH4\u2013C m\u22122\u00a0d\u22121\u00a0in July) and had shallower water tables than at older sites (200 to 1400 yr; emitting 6.55\u00a0\u00b1\u00a02.23 mg CH4\u2013C m\u22122\u00a0d\u22121\u00a0in July). Carbon lost via CH4\u00a0efflux during the growing season at these intermediate age sites was 8% of uptake by net ecosystem exchange. Our results provide evidence that CH4\u00a0emissions following lowland permafrost thaw are enhanced over decadal time scales, but limited over millennia. Over larger spatial scales, adjacent fen systems may contribute sustained CH4\u00a0emission, CO2\u00a0uptake, and DOC export. We argue that over timescales of decades to centuries, thaw features in high-latitude lowland peatlands, particularly those developed on poorly drained mineral substrates, are a key locus of elevated CH4\u00a0emission to the atmosphere that must be considered for a complete understanding of high latitude CH4\u00a0dynamics.",
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