Changes of methane and nitrous oxide emissions in a transition bog in central Germany (German National Park Harz Mountains) after rewetting |
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Authors: | Katja Osterloh Nadine Tauchnitz Oliver Spott Johannes Hepp Sabine Bernsdorf Ralph Meissner |
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Affiliation: | 1.Faculty of Natural Sciences III, Institute of Agronomy and Nutritional Sciences,Martin-Luther-University Halle-Wittenberg,Halle (Saale),Germany;2.Department 25, Agro Ecology and EU Attended Monitoring,State Institute for Agriculture and Horticulture Saxony-Anhalt,Bernburg,Germany;3.Department of Soil Physics,Helmholtz Centre for Environmental Research-UFZ,Halle (Saale),Germany;4.Faculty of Natural Sciences III, Institute of Agronomy and Nutritional Sciences, Soil Biogeochemistry,Martin-Luther-University Halle-Wittenberg,Halle (Saale),Germany;5.Department of Soil Physics,Helmholtz Centre for Environmental Research-UFZ,Altm?rkische Wische,Germany |
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Abstract: | During the last decades, various renaturation programmes have been initialized to recover nutrient sink and ecological functions of peatlands by rewetting. Rewetting, however, often results in the formation of hotspots for methane (CH4) emissions and in temporal dieback of local vegetation. The present study aimed at quantifying changes of CH4 and nitrous oxide (N2O) emissions in a peatland currently under continuous rewetting conditions. Emissions where studied at a permanently flooded site and a non-flooded peat site with fluctuating water tables by using common closed chamber method. The permanently flooded site revealed extremely high CH4 emissions (up to 1195 mg C m?2 d?1) which were positively correlated with temperature, nutrient content, dissolved organic carbon and nitrogen concentration of the peat soil water. In contrast, the non-flooded peat site, with lower and fluctuating water tables (WT), showed significantly lower CH4 emissions and an increasing trend of CH4 release associated with a generally increasing WT caused by the progressing rewetting process. Lower N2O emissions (<24 µg N m?2 d?1) were observed at the flooded site. By contrast, the non-flooded peat site with fluctuating WT showed significantly higher N2O emissions (up to 4178 µg N m?2 d?1), in particular at high temperatures during summer time. The present results indicate that permanently flooded conditions during rewetting processes might cause higher CH4 emissions compared to fluctuating WT which in contrast might enhance N2O emissions. In total, however, no decreasing trend for CH4 emissions throughout the five-year renaturation period could be found. At least for N2O we observed a decreasing trend during rewetting. |
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