TY  - JOUR
A1  - Wen, Xi
A1  - Unger, Viktoria
A1  - Jurasinski, Gerald
A1  - Koebsch, Franziska
A1  - Horn, Fabian
A1  - Rehder, Gregor
A1  - Sachs, Torsten
A1  - Zak, Dominik
A1  - Lischeid, Gunnar
A1  - Knorr, Klaus-Holger
A1  - Boettcher, Michael E.
A1  - Winkel, Matthias
A1  - Bodelier, Paul L. E.
A1  - Liebner, Susanne
T1  - Predominance of methanogens over methanotrophs in rewetted fens characterized by high methane emissions
JF  - Biogeosciences
N2  - The rewetting of drained peatlands alters peat geochemistry and often leads to sustained elevated methane emission. Although this methane is produced entirely by microbial activity, the distribution and abundance of methane-cycling microbes in rewetted peatlands, especially in fens, is rarely described. In this study, we compare the community composition and abundance of methane-cycling microbes in relation to peat porewater geochemistry in two rewetted fens in northeastern Germany, a coastal brackish fen and a freshwater riparian fen, with known high methane fluxes. We utilized 16S rRNA high-throughput sequencing and quantitative polymerase chain reaction (qPCR) on 16S rRNA, mcrA, and pmoA genes to determine microbial community composition and the abundance of total bacteria, methanogens, and methanotrophs. Electrical conductivity (EC) was more than 3 times higher in the coastal fen than in the riparian fen, averaging 5.3 and 1.5 mS cm(-1), respectively. Porewater concentrations of terminal electron acceptors (TEAs) varied within and among the fens. This was also reflected in similarly high intra- and inter-site variations of microbial community composition. Despite these differences in environmental conditions and electron acceptor availability, we found a low abundance of methanotrophs and a high abundance of methanogens, represented in particular by Methanosaetaceae, in both fens. This suggests that rapid (re) establishment of methanogens and slow (re) establishment of methanotrophs contributes to prolonged increased methane emissions following rewetting.
Y1  - 2018
U6  - https://doi.org/10.5194/bg-15-6519-2018
SN  - 1726-4170
SN  - 1726-4189
VL  - 15
IS  - 21
SP  - 6519
EP  - 6536
PB  - Copernicus
CY  - Göttingen
ER  - 
TY  - JOUR
A1  - Heinrich, Ingo
A1  - Balanzategui, Daniel
A1  - Bens, Oliver
A1  - Blasch, Gerald
A1  - Blume, Theresa
A1  - Boettcher, Falk
A1  - Borg, Erik
A1  - Brademann, Brian
A1  - Brauer, Achim
A1  - Conrad, Christopher
A1  - Dietze, Elisabeth
A1  - Dräger, Nadine
A1  - Fiener, Peter
A1  - Gerke, Horst H.
A1  - Güntner, Andreas
A1  - Heine, Iris
A1  - Helle, Gerhard
A1  - Herbrich, Marcus
A1  - Harfenmeister, Katharina
A1  - Heussner, Karl-Uwe
A1  - Hohmann, Christian
A1  - Itzerott, Sibylle
A1  - Jurasinski, Gerald
A1  - Kaiser, Knut
A1  - Kappler, Christoph
A1  - Koebsch, Franziska
A1  - Liebner, Susanne
A1  - Lischeid, Gunnar
A1  - Merz, Bruno
A1  - Missling, Klaus Dieter
A1  - Morgner, Markus
A1  - Pinkerneil, Sylvia
A1  - Plessen, Birgit
A1  - Raab, Thomas
A1  - Ruhtz, Thomas
A1  - Sachs, Torsten
A1  - Sommer, Michael
A1  - Spengler, Daniel
A1  - Stender, Vivien
A1  - Stüve, Peter
A1  - Wilken, Florian
T1  - Interdisciplinary Geo-ecological Research across Time Scales in the Northeast German Lowland Observatory (TERENO-NE)
JF  - Vadose zone journal
N2  - The Northeast German Lowland Observatory (TERENO-NE) was established to investigate the regional impact of climate and land use change. TERENO-NE focuses on the Northeast German lowlands, for which a high vulnerability has been determined due to increasing temperatures and decreasing amounts of precipitation projected for the coming decades. To facilitate in-depth evaluations of the effects of climate and land use changes and to separate the effects of natural and anthropogenic drivers in the region, six sites were chosen for comprehensive monitoring. In addition, at selected sites, geoarchives were used to substantially extend the instrumental records back in time. It is this combination of diverse disciplines working across different time scales that makes the observatory TERENO-NE a unique observation platform. We provide information about the general characteristics of the observatory and its six monitoring sites and present examples of interdisciplinary research activities at some of these sites. We also illustrate how monitoring improves process understanding, how remote sensing techniques are fine-tuned by the most comprehensive ground-truthing site DEMMIN, how soil erosion dynamics have evolved, how greenhouse gas monitoring of rewetted peatlands can reveal unexpected mechanisms, and how proxy data provides a long-term perspective of current ongoing changes.
Y1  - 2018
U6  - https://doi.org/10.2136/vzj2018.06.0116
SN  - 1539-1663
VL  - 17
IS  - 1
PB  - Soil Science Society of America
CY  - Madison
ER  -