Abstract
Peatland rewetting aims at stopping the emissions of carbon dioxide (CO2) and establishing net carbon sinks. However, in times of global warming, res-
toration projects must increasingly deal with extreme events such as drought periods. Here, we evaluate the effect of the European summer drought 2018
on vegetation development and the exchange of methane (CH4 ) and CO2 in two rewetted minerotrophic fens (Hütelmoor—Hte and Zarnekow—Zrk)
including potential carry-over effects in the post-drought year. Drought was a major stress factor for the established vegetation but also promoted
the rapid spread of new vegetation, which will likely gain a lasting foothold in Zrk. Accordingly, drought increased not only respiratory CO2 losses but
also photosynthetic CO2 uptake. Altogether, the drought reduced the net CO2 sink in Hte, while it stopped the persistent net CO2 emissions of Zrk.
In addition, the drought reduced CH 4 emissions in both fens, though this became most apparent in the post-drought year and suggests a lasting
shift towards non-methanogenic organic matter decomposition. Occasional droughts can be beneficial for the restoration of the peatland carbon sink
function if the newly grown vegetation increases CO2 sequestration in the long term. Nonetheless, care must be taken to prevent extensive peat decay.
If you want to participate in this seminar please send an e-mail to:
baltic.transcoast(at)uni-rostock.de
to receive a link (most likely Zoom) to the seminar.
By taking part in this online event you confirm that you considered and agree to the terms and conditions as well as the privacy policy of the online platform used. The host or institutions do not take liability for any detriments from using the platform!