Volume 26 (2020) Article 23

Flooding of an abandoned fen by beaver led to highly variable greenhouse gas emissions

by M. Minke, A. Freibauer, T. Yarmashuk, A. Burlo, H. Harbachova, A. Schneider, V. Tikhonov, J. Augustin

Published online: 09.08.2020

Summary

Rewetting by beaver is reported from many European peatlands and especially from Belarus, which harbours vast abandoned peat extraction sites and a large beaver population. We studied how vegetation and exchange rates of carbon dioxide (CO₂), methane (CH₄) and nitrous oxide (N₂O) changed after beaver had rewetted an abandoned drained fen in Belarus. We selected three sites with different vegetation and water levels. One meadow site turned into a nutrient-poor lake that remained virtually free of living vascular plants, released CO₂ and CH₄, and was a moderate source of greenhouse gases (GHG). In another meadow site that became shallowly flooded, the died-off vegetation was quickly replaced by mire plant species and in the second year the site had already become a strong CO₂ sink, a moderate CH₄ source and, as a result, a strong carbon sink and a weak net GHG emitter. The third site was dominated by forbs that died after intermittent flooding and were only slowly and sparsely replaced by wetland species. This site was a strong source of CO₂ and N₂O. Beaver activity can restore a peatland’s carbon sink and reduce GHG emissions. However, as for human-induced rewetting, the outcome depends on starting conditions, position and constancy of the water level, and the time needed for establishment of peat forming vegetation.

Citation

Minke, M., Freibauer, A., Yarmashuk, T., Burlo, A., Harbachova, H., Schneider, A., Tikhonov, V., Augustin, J. (2020) Flooding of an abandoned fen by beaver led to highly variable greenhouse gas emissions. Mires and Peat, 26, 23, 24pp. (Online: http://www.mires-and-peat.net/pages/volumes/map26/map2623.php); doi: 10.19189/MaP.2019.SNPG.StA.1808

Reviewers

IMCG and IPS acknowledge the work of the reviewers.