Articles | Volume 19, issue 7
https://doi.org/10.5194/bg-19-1959-2022
https://doi.org/10.5194/bg-19-1959-2022
Research article
 | 
06 Apr 2022
Research article |  | 06 Apr 2022

Peat macropore networks – new insights into episodic and hotspot methane emission

Petri Kiuru, Marjo Palviainen, Tiia Grönholm, Maarit Raivonen, Lukas Kohl, Vincent Gauci, Iñaki Urzainki, and Annamari Laurén

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Cited articles

Abdalla, M., Hastings, A., Truu, J., Espenberg, M., Mander, Ü., and Smith, P.: Emissions of methane from northern peatlands: a review of management impacts and implications for future management options, Ecol. Evol., 6, 7080–7102, https://doi.org/10.1002/ece3.2469, 2016. a, b
Asmala, E., Carstensen, J., and Räike, A.: Multiple anthropogenic drivers behind upward trends in organic carbon concentrations in boreal rivers, Environ. Res. Lett., 14, 124018, https://doi.org/10.1088/1748-9326/ab4fa9, 2019. a
Bachmann, J. and van der Ploeg, R. R.: A review on recent developments in soil water retention theory: interfacial tension and temperature effects, J. Plant Nutr. Soil Sc., 165, 468–478, https://doi.org/10.1002/1522-2624(200208)165:4<468::AID-JPLN468>3.0.CO;2-G, 2002. a
Ball, B. C. and Smith, K. A.: Gas movement and air-filled porosity, in: Soil and Environmental Analysis: Physical Methods, edited by: Smith, K. A. and Mullins, C. E., 499–538, Marcel Dekker, New York, NY, 2001. a
Barthélemy, M.: Spatial networks, Phys. Rep., 499, 1–101, https://doi.org/10.1016/j.physrep.2010.11.002, 2011. a
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Short summary
Peatlands are large sources of methane (CH4), and peat structure controls CH4 production and emissions. We used X-ray microtomography imaging, complex network theory methods, and pore network modeling to describe the properties of peat macropore networks and the role of macropores in CH4-related processes. We show that conditions for gas transport and CH4 production vary with depth and are affected by hysteresis, which may explain the hotspots and episodic spikes in peatland CH4 emissions.
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