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- Title
\textbf{Testing submerged drains as a greenhouse gas mitigation measure for intensively managed grassland on bog peat}.
- Authors
Sokolowsky, Liv; Tiemeyer, Bärbel; Dettmann, Ullrich; Frank, Stefan; Brümmer, Christian
- Abstract
Intact peatland ecosystems are efficient sinks of atmospheric carbon dioxide (CO2). Drainagefor agriculture, forestry or peat mining triggers mineralization and turns peatlands intohotspots of greenhouse gas (GHG) emissions. For example, emissions from drainedorganic soils on only 5 % of the area are estimated to cause more than one thirdof the emissions from the sectors agriculture and land use, land use change andforestry in Germany. It is well known that water level depths and soil moisture havesubstantial influence on CO2 emissions. Thus, raising water levels by submerged drainshas been proposed as a method to reduce CO2 emissions from agriculturally usedpeatlands. Our project in the "Gnarrenburger Moor", a managed bog peatland in North WestGermany is the first field-scale study on the effect of submerged drains using the eddycovariance method. Two sites under intensive grassland use are investigated. The first site iskept under the regionally typical water management with open drainage tubes in adepth of approximately 70 cm connected to ditches. At the second site submergeddrains were installed. They will be used for slight drainage during winter and activesubmerged infiltration of groundwater in summer. Thereby, we aim to ensure aconstantly high water level of at least 30 cm depth. The opportunity of temporarilylowering the water level to e.g. 50 cm simultaneously ensures trafficability. Atsix plots at each study site, fluxes of nitrous oxide (N2O) and methane (CH4) aremeasured with manual chambers every second week and more frequently afterfertilization. CO2 is continuously measured by the eddy covariance method using a LicorLI-7200 enclosed path CO2 and water vapor analyzer and a Gill HS-50 three axisanemometer. Additionally, we will quantify the effects of submerged drains on water quality and lossesof dissolved organic carbon (DOC). Water samples are collected from suction plates in threedepths and from ditches on both sites. Samples from drainage tubes and groundwater, usedfor submerged infiltration, will also be taken. All samples are analyzed for electricconductivity, pH-value, DOC, nitrogen compounds and phosphorus. Measurements areaccompanied by an extensive hydro-meteorological network comprising groundwater level,soil moisture sensors, tensiometers, discharge gauging, and common meteorological sensors.Our study is expected to reveal the effectiveness of using submerged drains as a potentialmitigation measure for GHG emissions from intensively managed grasslands on bog peat.
- Subjects
GERMANY; BOGS; PEAT bogs; DISSOLVED organic matter; WATER levels; GRASSLANDS; ATMOSPHERIC carbon dioxide; WATER vapor; GREENHOUSE gas mitigation
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article