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Sulfate deprivation triggers high methane production in a disturbed and rewetted coastal peatland

Urheber*innen
/persons/resource/koebsch

Koebsch,  Franziska
1.4 Remote Sensing, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
TERENO, Deutsches GeoForschungsZentrum;

/persons/resource/mwinkel

Winkel,  Matthias
3.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
TERENO, Deutsches GeoForschungsZentrum;

/persons/resource/sliebner

Liebner,  Susanne
3.7 Geomicrobiology, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
TERENO, Deutsches GeoForschungsZentrum;

Liu,  Bo
External Organizations;
TERENO, Deutsches GeoForschungsZentrum;

Westphal,  Julia
External Organizations;
TERENO, Deutsches GeoForschungsZentrum;

Schmiedinger,  Iris
External Organizations;
TERENO, Deutsches GeoForschungsZentrum;

Spitzy,  Alejandro
External Organizations;
TERENO, Deutsches GeoForschungsZentrum;

Gehre,  Matthias
External Organizations;
TERENO, Deutsches GeoForschungsZentrum;

Jurasinski,  Gerald
External Organizations;
TERENO, Deutsches GeoForschungsZentrum;

Köhler,  Stefan
External Organizations;
TERENO, Deutsches GeoForschungsZentrum;

Unger,  Viktoria
External Organizations;
TERENO, Deutsches GeoForschungsZentrum;

Koch,  Marian
External Organizations;
TERENO, Deutsches GeoForschungsZentrum;

/persons/resource/tsachs

Sachs,  T.
1.4 Remote Sensing, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
TERENO, Deutsches GeoForschungsZentrum;

Böttcher,  Michael E.
External Organizations;
TERENO, Deutsches GeoForschungsZentrum;

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4220890.pdf
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Zitation

Koebsch, F., Winkel, M., Liebner, S., Liu, B., Westphal, J., Schmiedinger, I., Spitzy, A., Gehre, M., Jurasinski, G., Köhler, S., Unger, V., Koch, M., Sachs, T., Böttcher, M. E. (2019): Sulfate deprivation triggers high methane production in a disturbed and rewetted coastal peatland. - Biogeosciences, 16, 9, 1937-1953.
https://doi.org/10.5194/bg-16-1937-2019


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_4220890
Zusammenfassung
In natural coastal wetlands, high supplies of marine sulfate suppress methanogenesis. Coastal wetlands are, however, often subject to disturbance by diking and drainage for agricultural use and can turn to potent methane sources when rewetted for remediation. This suggests that preceding land use measures can suspend the sulfate-related methane suppressing mechanisms. Here, we unravel the hydrological relocation and biogeochemical S and C transformation processes that induced high methane emissions in a disturbed and rewetted peatland despite former brackish impact. The underlying processes were investigated along a transect of increasing distance to the coastline using a combination of concentration patterns, stable isotope partitioning, and analysis of the microbial community structure. We found that diking and freshwater rewetting caused a distinct freshening and an efficient depletion of the brackish sulfate reservoir by dissimilatory sulfate reduction (DSR). Despite some legacy effects of brackish impact expressed as high amounts of sedimentary S and elevated electrical conductivities, contemporary metabolic processes operated mainly under sulfate-limited conditions. This opened up favorable conditions for the establishment of a prospering methanogenic community in the top 30–40 cm of peat, the structure and physiology of which resemble those of terrestrial organic-rich environments. Locally, high amounts of sulfate persisted in deeper peat layers through the inhibition of DSR, probably by competitive electron acceptors of terrestrial origin, for example Fe(III). However, as sulfate occurred only in peat layers below 30–40 cm, it did not interfere with high methane emissions on an ecosystem scale. Our results indicate that the climate effect of disturbed and remediated coastal wetlands cannot simply be derived by analogy with their natural counterparts. From a greenhouse gas perspective, the re-exposure of diked wetlands to natural coastal dynamics would literally open up the floodgates for a replenishment of the marine sulfate pool and therefore constitute an efficient measure to reduce methane emissions.