Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Biogeosciences, 11, 6595-6612, 2014
© Author(s) 2014. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
01 Dec 2014
Nitrous oxide emission budgets and land-use-driven hotspots for organic soils in Europe
T. Leppelt1, R. Dechow1, S. Gebbert1, A. Freibauer1, A. Lohila2, J. Augustin3, M. Drösler4, S. Fiedler5, S. Glatzel6, H. Höper7, J. Järveoja8, P. E. Lærke9, M. Maljanen10, Ü. Mander8, P. Mäkiranta11, K. Minkkinen12, P. Ojanen12, K. Regina13, and M. Strömgren14 1Thünen Institute of Climate-Smart Agriculture, Braunschweig, Germany
2Finnish Meteorological Institute, Helsinki, Finland
3Leibniz Centre for Agricultural Landscape Research, Müncheberg, Germany
4Weihenstephan-Triesdorf University of Applied Sciences, Freising, Germany
5Johannes Gutenberg University, Mainz, Germany
6University of Vienna, Vienna, Austria
7LBEG State Authority for Mining, Energy and Geology, Hannover, Germany
8University of Tartu, Tartu, Estonia
9Aarhus University, Department of Agroecology, Tjele, Denmark
10University of Eastern Finland, Kuopio, Finland
11Finnish Forest Research Institute, Vantaa, Finland
12University of Helsinki, Department of Forest Sciences, Helsinki, Finland
13MTT Agrifood Research Finland, Jokioinen, Finland
14Swedish University of Agricultural Sciences, Uppsala, Sweden
Abstract. Organic soils are a main source of direct emissions of nitrous oxide (N2O), an important greenhouse gas (GHG). Observed N2O emissions from organic soils are highly variable in space and time, which causes high uncertainties in national emission inventories. Those uncertainties could be reduced when relating the upscaling process to a priori-identified key drivers by using available N2O observations from plot scale in empirical approaches. We used the empirical fuzzy modelling approach MODE to identify main drivers for N2O and utilize them to predict the spatial emission pattern of European organic soils. We conducted a meta-study with a total amount of 659 annual N2O measurements, which was used to derive separate models for different land use types. We applied our models to available, spatially explicit input driver maps to upscale N2O emissions at European level and compared the inventory with recently published IPCC emission factors. The final statistical models explained up to 60% of the N2O variance. Our study results showed that cropland and grasslands emitted the highest N2O fluxes 0.98 ± 1.08 and 0.58 ± 1.03 g N2O-N m−2 a−1, respectively. High fluxes from cropland sites were mainly controlled by low soil pH value and deep-drained groundwater tables. Grassland hotspot emissions were strongly related to high amount of N-fertilizer inputs and warmer winter temperatures. In contrast, N2O fluxes from natural peatlands were predominantly low (0.07 ± 0.27 g N2O-N m−2 a−1) and we found no relationship with the tested drivers. The total inventory for direct N2O emissions from organic soils in Europe amount up to 149.5 Gg N2O-N a−1, which also included fluxes from forest and peat extraction sites and exceeds the inventory calculated by IPCC emission factors of 87.4 Gg N2O-N a−1. N2O emissions from organic soils represent up to 13% of total European N2O emissions reported in the European Union (EU) greenhouse gas inventory of 2011 from only 7% of the EU area. Thereby the model demonstrated that the major part (85%) of the inventory is induced by anthropogenic management, which shows the significant reduction potential by rewetting and extensification of agriculturally used peat soils.

Citation: Leppelt, T., Dechow, R., Gebbert, S., Freibauer, A., Lohila, A., Augustin, J., Drösler, M., Fiedler, S., Glatzel, S., Höper, H., Järveoja, J., Lærke, P. E., Maljanen, M., Mander, Ü., Mäkiranta, P., Minkkinen, K., Ojanen, P., Regina, K., and Strömgren, M.: Nitrous oxide emission budgets and land-use-driven hotspots for organic soils in Europe, Biogeosciences, 11, 6595-6612, doi:10.5194/bg-11-6595-2014, 2014.
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