Abstract
Aims
The contribution of boreal forest plants to the methane (CH4) cycle is still uncertain. We studied the above and belowground CH4 fluxes of common boreal plants, and assessed the possible contribution of CH4 producing and oxidizing microbes (methanogens and methanotrophs, respectively) to the fluxes.
Methods
We measured the CH4 fluxes and the amounts of methanogens and methanotrophs in the above- and belowground parts of Vaccinium myrtillus, Vaccinium vitis-idaea, Calluna vulgaris and Pinus sylvestris seedlings and in non-planted soil in a microcosm experiment.
Results
The shoots of C. vulgaris and P. sylvestris showed on average emissions of CH4, while the shoots of the Vaccinium species indicated small CH4 uptake. All the root-soil-compartments consumed CH4, however, the non-rooted soils showed on average small CH4 emission. We found methanotrophs from all the rooted and non-rooted soils. Methanogens were not detected in the plant or soil materials.
Conclusions
The presence of plant roots seem to increase the amount of methanotrophs and thus CH4 uptake in the soil. The CH4 emissions from the shoots of C. vulgaris and P. sylvestris demonstrate that the plants have an important contribution to the CH4 exchange dynamics in the plant-soil systems.
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Acknowledgements
This study has been supported by the Emil Aaltonen Foundation, The Academy of Finland Centre of Excellence (project 272041), Academy of Finland Research Fellow projects (292699, 263858, 288494), InGOS, ICOS (271878), ICOS-Finland (281255) and ICOS-ERIC (281250) funded by the Academy of Finland.
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Halmeenmäki, E., Heinonsalo, J., Putkinen, A. et al. Above- and belowground fluxes of methane from boreal dwarf shrubs and Pinus sylvestris seedlings. Plant Soil 420, 361–373 (2017). https://doi.org/10.1007/s11104-017-3406-7
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DOI: https://doi.org/10.1007/s11104-017-3406-7