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https://doi.org/10.5194/bg-2018-456
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2018-456
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 07 Nov 2018

Research article | 07 Nov 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Biogeosciences (BG).

Multi-year effect of wetting on CH4 flux at taiga-tundra boundary in northeastern Siberia deduced from stable isotope ratios of CH4

Ryo Shingubara1,a, Atsuko Sugimoto2,3,4, Jun Murase5, Go Iwahana2,6, Shunsuke Tei2,3, Maochang Liang1,b, Shinya Takano1, Tomoki Morozumi1, and Trofim Maximov7,8 Ryo Shingubara et al.
  • 1Graduate School of Environmental Science, Hokkaido University, Sapporo, 060-0810, Japan
  • 2Arctic Research Center, Hokkaido University, Sapporo, 001-0021, Japan
  • 3Faculty of Environmental Earth Science, Hokkaido University, Sapporo, 060-0810, Japan
  • 4Global Station for Arctic Research, Global Institution for Collaborative Research and Education, Hokkaido University, Sapporo, 060-0808, Japan
  • 5Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, 464-8601, Japan
  • 6International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, 99775-7340 , USA
  • 7Institute for Biological Problems of Cryolithozone, Siberian Branch, Russian Academy of Sciences, Yakutsk, 677890, Russia
  • 8Institute of Natural Sciences, North-Eastern Federal University, Yakutsk, 677000, Russia
  • acurrently at: Graduate School of Environmental Studies, Nagoya University, Nagoya, 464-8601, Japan
  • bcurrently at: College of Horticulture and Gardening, Yangtze University, Jingzhou, 434023, China

Abstract. The response of CH4 emission from natural wetlands to meteorological conditions is important because of its strong greenhouse effect. To understand relationship between CH4 flux and wetting, we observed interannual variations in chamber CH4 flux, and concentration, δ13C, and δD of dissolved CH4 in summers from 2009 to 2013 at the taiga-tundra boundary in the vicinity of Chokurdakh (70°37'N, 147°55'E) on the lowland of the Indigirka River in northeastern Siberia. We also conducted incubation experiments to interpret δ13C and δD of CH4 to investigate variations in CH4 production and oxidation processes. Methane flux showed large interannual variation in wet areas of sphagnum mosses and sedges (36–140mgCH4m−2day−1 as emission). Increased CH4 flux was recorded in summer 2011 when a wetting event with extreme precipitation occurred. Although water level decreased from 2011 to 2013, CH4 flux remained relatively large in 2012, and increased further in 2013. Concurrently, dissolved CH4 concentration rose by one order of magnitude from 2011 to 2012, and increased further from 2012 to 2013. Large variations in δ13C and δD of dissolved CH4 were observed in 2011, and less variations were seen in 2012 and 2013, suggesting both enhancement of CH4 production and depression of CH4 oxidation. These multi-year effects of wetting on CH4 dynamics may have been caused by continued soil reduction across multiple years after wetting, which suggests that duration of water saturation in the active layer can be important for predicting CH4 emission following a wetting event in permafrost ecosystem.

Ryo Shingubara et al.
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Ryo Shingubara et al.
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(1) Wetting event with extreme precipitation increased methane emission from wetland, especially two summers later despite the decline in water level after the wetting. (2) Isotopic compositions of methane in soil pore water suggested enhancement of production and depressed oxidation in the following two summer after the wetting event. (3) Duration of water saturation in the active layer may be important for predicting methane emission after a wetting event in permafrost ecosystem.
(1) Wetting event with extreme precipitation increased methane emission from wetland, especially...
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