K. Leiber-Sauheitl, C. Voigt, R. Fuß, A. Freibauer
Proceedings of the 14th International Peat Congress
emission-factors, greenhouse-gases, organic-soils, peat-bog, small-scale-gradients
Theme X. Peatland carbon budgets and greenhouse gas (GHG) fluxes
The joint research project “Organic soils” aims at closing the data gap on the contribution of organic soils to German total GHG fluxes by monitoring emissions from eleven catchments.
The former peat bog Grosses Moor (Gifhorn, Lower Saxony) has been altered by drainage and peat cutting. Current cultivation is grassland under extensive agricultural use. The study focused on the measurement of CO2, CH4 and N2O fluxes with manual static chambers. In particular, the influence of different soil organic carbon contents (SOC) and ground water levels on greenhouse gas emissions was studied.
In 2011, CO2 was the most important greenhouse gas. CH4 and N2O fluxes were on a low level as could be expected due to site conditions. Emissions were highly influenced by the groundwater table. Highest CO2 emissions occurred at water tables 40-50 cm below ground level, temperatures above 10°C and low plant biomass values. In comparison to other factors, SOC was of minor importance.