Articles | Volume 19, issue 21
https://doi.org/10.5194/bg-19-5041-2022
https://doi.org/10.5194/bg-19-5041-2022
Research article
 | 
02 Nov 2022
Research article |  | 02 Nov 2022

Pore network modeling as a new tool for determining gas diffusivity in peat

Petri Kiuru, Marjo Palviainen, Arianna Marchionne, Tiia Grönholm, Maarit Raivonen, Lukas Kohl, 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
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Bakker, J. W. and Hidding, A.: The influence of soil structure and air content on gas diffusion in soils, Neth. J. Agr. Sci., 18, 37–48, https://doi.org/10.18174/njas.v18i1.17354, 1970. a
Ball, B. C. and Smith, K. A.: Gas movement and air-filled porosity, in: Soil and Environmental Analysis: Physical Methods, 2nd Edn., edited by: Smith, K. A. and Mullins, C. E., 499–538, Marcel Dekker, New York, NY, ISBN 978-0-8247-0414-8, 2001. a
Beven, K. and Germann, P.: Macropores and water flow in soils, Water Resour. Res., 18, 1311–1325, https://doi.org/10.1029/WR018i005p01311, 1982. a
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Short summary
Peatlands are large carbon stocks. Emissions of carbon dioxide and methane from peatlands may increase due to changes in management and climate. We studied the variation in the gas diffusivity of peat with depth using pore network simulations and laboratory experiments. Gas diffusivity was found to be lower in deeper peat with smaller pores and lower pore connectivity. However, gas diffusivity was not extremely low in wet conditions, which may reflect the distinctive structure of peat.
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