文章基本信息

标题：Temperature Sensitivity of Methane Production in the Permafrost Active Layer at Stordalen, Sweden: A Comparison with Non-permafrost Northern Wetlands
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作者：M. Lupascu ; J. L. Wadham ; E. R. C. Hornibrook 等
期刊名称：Arctic, Antarctic, and Alpine Research
印刷版ISSN：1523-0430
电子版ISSN：1938-4246
出版年度：2012
卷号：44
期号：4
页码：469-482
DOI：10.1657/1938-4246-44.4.469
摘要：Relationships were determined between methane (CH 4 ) production and in situ conditions within the permafrost active layer during a single melt season at Stordalen, Sweden, with a specific emphasis on temperature sensitivity of methanogenesis. In situ temperature, moisture, pH, dissolved organic carbon, and CH 4 concentration data were measured at three contrasting active layer sites (sedge mire, Sphagnum mire, and ombrotrophic bog), and laboratory incubations of active layer material were subsequently employed to determine the sensitivity of CH 4 production to temperature. Q 10 values, describing the CH 4 production response of peat to a temperature change of 10 °C, ranged from 1.9 to 3.5 and 2.4 to 5.8 for the sedge and Sphagnum mire sites, respectively. A wider review of the literature on Q 10 responses of methanogenesis in northern peatlands shows similar features to the temperature response of CH 4 production in the active layer at Stordalen. In general, Q 10 values are not significantly different in Arctic permafrost wetlands than non-Arctic northern wetlands; however, Sphagnum sites display Q 10 responses (mean Q 10 = 8) that are notably greater than that of wetter minerotrophic-sedge environments (mean Q 10 = 4.3). This finding has implications for the parameterization of Q 10 factors in numerical carbon cycling models, and suggests that the use of spatially variable Q 10 values could be a useful approach for more accurate modeling of CH 4 fluxes from northern wetlands under different climatic change scenarios.