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Die Wechselwirkungen zwischen Biosphäre und Gashydraten

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/persons/resource/mluzi

Luzi-Helbing,  Manja
Vol. 5, Issue 1 (2015), GFZ Journal 2015, System Erde : GFZ Journal, Deutsches GeoForschungsZentrum;
4.2 Inorganic and Isotope Geochemistry, 4.0 Chemistry and Material Cycles, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/kama

Mangelsdorf,  Kai
Vol. 5, Issue 1 (2015), GFZ Journal 2015, System Erde : GFZ Journal, Deutsches GeoForschungsZentrum;
4.3 Organic Geochemistry, 4.0 Chemistry and Material Cycles, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/dwagner

Wagner,  Dirk
Vol. 5, Issue 1 (2015), GFZ Journal 2015, System Erde : GFZ Journal, Deutsches GeoForschungsZentrum;
4.5 Geomicrobiology, 4.0 Chemistry and Material Cycles, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/schick

Schicks,  Judith
Vol. 5, Issue 1 (2015), GFZ Journal 2015, System Erde : GFZ Journal, Deutsches GeoForschungsZentrum;
4.2 Inorganic and Isotope Geochemistry, 4.0 Chemistry and Material Cycles, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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GFZ_syserde.05.01.06.pdf
(Verlagsversion), 4MB

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Zitation

Luzi-Helbing, M., Mangelsdorf, K., Wagner, D., Schicks, J. (2015): Die Wechselwirkungen zwischen Biosphäre und Gashydraten. - System Erde, 5, 1, 34-39.
https://doi.org/10.2312/GFZ.syserde.05.01.6


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1199650
Zusammenfassung
The relationship between gas hydrates, microorganisms and the surrounding sediment is extremely complex. Microorganisms can either act as producer or consumer of organic compounds. By converting organic matter microorganisms produce methane and therefore provide the prerequisite for gas hydrate formation. In natural environment clay minerals immobilize the substrates feeding the methane producing microorganisms. As a result of microbial activity gas hydrates are surrounded by a great variety of organic compounds which are not incorporated into the hydrate structure but influence the formation process. Through anaerobic metabolic activity special bacteria produce biosurfactants which were found to enhance the hydrate formation process significantly and act as nucleation centres. Another source of organic compounds is sediment organic matter (SOM) originating from plant material or animal remains which may also enhance hydrate growth. On the other hand methane is an energy source for special microbial methanotroph communities growing either aerobically or anaerobically. In sediments containing oxygen this methane will be oxidized into carbon dioxide. In the lower parts of the sediment methane originating from gas hydrates is oxidized anaerobically into bicarbonate by methanogenic archaea and sulphur reducing bacteria. In presence of dissolved calcium bicarbonate precipitates as calcium carbonate und forms carbonate crusts within the upper sediment layers of the sea floor.