Effect of peat re-wetting on carbon and nutrient fluxes, greenhouse gas production and diversity of methanogenic archaeal community

Many peatlands were affected by drainage in the past, and restoration of their water regime aims to bring back their original functions. The purpose of our study was to simulate re-wetting of soils of different types of drained peatlands (bogs and minerotrophic mires, located in the Sumava Mountains...

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Bibliographic Details
Published in:Ecological engineering 2011-07, Vol.37 (7), p.1017-1026
Main Authors: Urbanová, Zuzana, Picek, Tomáš, Bárta, Jiří
Format: Article
Language:English
Subjects:
bogs
carbon
Carbon dioxide
Communities
community structure
dissolved organic nitrogen
drainage
ecosystems
environmental factors
fens
greenhouse gas emissions
greenhouse gases
Leaching
Methane
methane production
Methanogenic archaeal community
methanogens
methanotrophs
Mountains
nitrates
nitrogen
Nutrient mobilization
Nutrients
peat
Peatland
Peatlands
phosphorus
Re-wetting
Restoration
risk
soil
Soils
vegetation
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Summary:Many peatlands were affected by drainage in the past, and restoration of their water regime aims to bring back their original functions. The purpose of our study was to simulate re-wetting of soils of different types of drained peatlands (bogs and minerotrophic mires, located in the Sumava Mountains, Czech Republic) under laboratory conditions (incubation for 15 weeks) and to assess possible risks of peatland water regime restoration – especially nutrient leaching and the potentials for CO 2 and CH 4 production. After re-wetting of soils sampled from drained peatlands (simulated by anaerobic incubation) (i) phosphorus concentration (SRP) did not change in any soil, (ii) concentration of ammonium and dissolved organic nitrogen (DON) increased, but only in a drained fen, (iii) DOC increased significantly in the drained fen and degraded drained bog, (iv) CO 2 production decreased, (v) CH 4 production and the number of methanogens increased in all soils, and (vi) archaeal methanogenic community composition was also affected by re-wetting; it differed significantly between drained and pristine fens, whereas it was more similar between drained and pristine bogs. Overall, the soils from fens reacted more dynamically to re-wetting than the bogs, and therefore, some nutrients (especially nitrogen) and DOC leaching may be expected from drained fens after their water regime restoration. However, if compared to their state before restoration, ammonium and phosphorus leaching should not increase and leaching of nitrates and DON should even decrease after restoration, especially during the vegetation season. Further, CO 2 production in soils of fens and bogs should decrease after their water regime restoration, whereas CH 4 production in soils should increase. However, we cannot derive any clear conclusions about CH 4 emissions from the ecosystems based on this study, as they depend strongly on environmental factors and on the actual activity of methanotrophs in situ.
ISSN:0925-8574
1872-6992
DOI:10.1016/j.ecoleng.2010.07.012