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Dung application increases CH4 production potential and alters the composition and abundance of methanogen community in restored peatland soils from Europe

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Hahn, J., Juottonen, H., Fritze, H., & Tuittila, E.-S. (2018). Dung application increases CH4 production potential and alters the composition and abundance of methanogen community in restored peatland soils from Europe. Biology and Fertility of Soils, 54 (4), 533-547. doi:10.1007/s00374-018-1279-4
Published in
Biology and Fertility of Soils
Authors
Hahn, Juliane |
Juottonen, Heli |
Fritze, Hannu |
Tuittila, Eeva-Stiina
Date
2018
Discipline
Ekologia ja evoluutiobiologia
Copyright
© Springer-Verlag GmbH Germany, part of Springer Nature 2018. This is a final draft version of an article whose final and definitive form has been published by Springer. Published in this repository with the kind permission of the publisher.

 
Peatland restoration via rewetting aims to recover biological communities and biogeochemical processes typical to pristine peatlands. While rewetting promotes recovery of C accumulation favorable for climate mitigation, it also promotes methane (CH4) emissions. The potential for exceptionally high emissions after rewetting has been measured for Central European peatland sites previously grazed by cattle. We addressed the hypothesis that these exceptionally high CH4 emissions result from the previous land use. We analyzed the effects of cattle dung application to peat soils in a short- (2 weeks), a medium- (1 year) and a long-term (grazing) approach. We measured the CH4 production potentials, determined the numbers of methanogens by mcrA qPCR, and analyzed the methanogen community by mcrA T-RFLP-cloning-sequencing. Dung application significantly increased the CH4 production potential in the short- and the medium-term approach and non-significantly at the cattle-grazed site. The number of methanogens correlated with the CH4 production in the short- and the long-term approach. At all three time horizons, we found a shift in methanogen community due to dung application and a transfer of rumen methanogen sequences (Methanobrevibacter spp.) to the peatland soil that seemed related to increased CH4 production potential. Our findings indicate that cattle grazing of drained peatlands changes their methanogenic microbial community, may introduce rumen-associated methanogens and leads to increased CH4 production. Consequently, rewetting of previously cattle-grazed peatlands has the potential to lead to increased CH4 emissions. Careful consideration of land use history is crucial for successful climate mitigation with peatland rewetting. ...
Publisher
Springer
ISSN Search the Publication Forum
0178-2762
Keywords
turvemaat laitumet ennallistaminen lanta kasvihuonekaasut metaani climate mitigation rewetting methane cattle grazing methanogen land use
DOI
https://doi.org/10.1007/s00374-018-1279-4
URI

http://urn.fi/URN:NBN:fi:jyu-201805032446

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