Research Data:
Data from: Greenhouse gas fluxes from two drained pond sediments: a mesocosm study

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datacite.resourcetypeSediment parameters
dc.contributor.authorBorken, Werner
dc.contributor.contactpersonBorken, Werner
dc.date.accessioned2025-02-14T11:46:38Z
dc.date.available2025-02-14T11:46:38Z
dc.date.issued2025-02-14
dc.description.abstractPonds can store large amounts of organic matter (OM) in their sediments, often accumulated over long periods of time. Sediment OM is largely protected from aerobic mineralization under water saturated conditions but are vulnerable when exposed to oxygen during periods of drought. As climate change progresses, drought periods are likely to occur more frequently and may affect OM mineralization, and thus the release of greenhouse gases (GHGs) such as carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) from pond ecosystems. Therefore, we aimed to test how GHG emissions and concentrations in the sediment respond to drought by gradually decreasing water levels to below the sediment surface. To this end, undisturbed sediment cores from two small ponds with distinct watershed and water chemistry characteristics were incubated in mesocosms for 118 days at 20°C. Water levels were sequentially tested at 3 cm above the sediment surface (Phase I) and at the level of the sediment surface (Phase II). In Phase III, water levels were continuously lowered either by evaporation or by active drainage including evaporation. Mean CH4 fluxes of both ponds were high (21 and 87 mmol m-2 d-1), contributing 90 and 96% to the GHG budget over the three phases. The highest CH4 fluxes occurred in Phase II, while active drainage strongly reduced CH4 fluxes in Phase III. A multivariate analysis suggests that dissolved organic carbon and sulphate were important drivers of CH4 fluxes in Phase III. CO2 and N2O fluxes also responded to declining water levels, but their contribution to the GHG budget was rather small. Both gases were primarily produced in the upper sediment layer as indicated by highest concentrations at 5 cm sediment depth. Compaction of sediment cores by water level lowering increased bulk density and maintained high water contents. This side effect, retarding the drying of the sediment surface, was possibly relevant for the GHG net emission of the sediments in Phase II and III. Overall, GHG fluxes from the sediments exhibited high sensitivity to falling water levels. This study suggests that drying pond sediments have great potential to emit large amounts of GHGs to the atmosphere in the event of drought, representing hot spots of GHGs in the landscape.N/A
dc.identifier.urihttps://rdspace.uni-bayreuth.de/handle/rdspace-ubt/337
dc.identifier.urihttps://doi.org/10.57880/rdspace-ubt-4
dc.language.isoen
dc.rights.licenseCreative Commons Attribution Share Alike 4.0 International
dc.rights.spdx-idCC-BY-SA-4.0
dc.rights.urihttps://spdx.org/licenses/CC-BY-SA-4.0.html
dc.subjectPond Sediment
dc.subjectDrainage
dc.subjectDrought
dc.subjectCarbon Dioxide
dc.subjectMethane
dc.subjectNitrous Oxide
dc.subject.dfg3 Natural Sciences
dc.subject.dfg3 Natural Sciences :: 34 Earth Sciences
dc.subject.dfg3 Natural Sciences :: 34 Earth Sciences :: 318 Water Research
dc.titleData from: Greenhouse gas fluxes from two drained pond sediments: a mesocosm studyN/A
dc.typeAggregated Dataset
dspace.entity.typeResearchData
local.assignedto.departmentUniversity of Bayreuth > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Fachgruppe Geowissenschaften
local.assignedto.facultyUniversity of Bayreuth > Faculty of Biology, Chemistry and Earth Sciences > Fakultät für Biologie, Chemie und Geowissenschaften
local.assignedto.professorshipProfessorship of Soil Ecology
local.assignedto.universityUniversity of BayreuthnullUniversität Bayreuth
local.retention.typepublication
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