EGU2020-3020
https://doi.org/10.5194/egusphere-egu2020-3020
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Biotic and abiotic controls on carbon storage in aggregates from grassland soils in the Northern Limestone Alps of Germany

Noelia Garcia-Franco1, Martin Wiesmeier1,2, Roswitha Walter2, Luis Carlos Colocho-Hurtarte1, Vincent Buness1, Bernd Josef Berauer3, Marcus Zistl-schlingmann4, Ralf Kiese4, Michael Dannenmann4, and Ingrid Kögel-Knabner1,5
Noelia Garcia-Franco et al.
  • 1Chair of Soil Science, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany
  • 2Bavarian State Research Centre for Agriculture, Freising, Germany
  • 3Department of Disturbance Ecology, University of Bayreuth, Bayreuth, Germany
  • 4Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Garmisch-Partenkirchen, Germany
  • 5Institute for Advanced Study, Technical University Munich, Garching, Germany

Alpine and pre-alpine grassland soils in Bavaria provide important ecosystem services and are hotspots for soil organic carbon (SOC) storage.  However, information on the underlying factors that control SOC stabilization via soil aggregation is limited. In three grassland soils with the same parent material but at different elevation (Fendt: 600 m.a.s.l, Graswang: 860 m a.s.l and Esterberg: 1,260 m a.s.l), we studied the soil aggregate distribution and associated SOC according to aggregate size classes (large-macroaggregates > 2,000 µm, small-macroaggregates 250-2000 µm, microaggregates 63-250 µm, silt plus clay particles <63 µm). Furthermore, the biomass and abundance of different ecological groups of earthworms were determined. Our results showed an increase in SOC contents and aggregate stability with elevation. SOC and N stocks of bulk soils showed the same trend as OC contents in aggregates.  Principal component analysis revealed that carbonates, SOC, aboveground plant biomass and the earthworm biomass are the main facilitating agents of aggregation and SOC and N storage in grassland soils of the Northern Limestone Alps of Germany

How to cite: Garcia-Franco, N., Wiesmeier, M., Walter, R., Colocho-Hurtarte, L. C., Buness, V., Berauer, B. J., Zistl-schlingmann, M., Kiese, R., Dannenmann, M., and Kögel-Knabner, I.: Biotic and abiotic controls on carbon storage in aggregates from grassland soils in the Northern Limestone Alps of Germany, EGU General Assembly 2020, Online, 4–8 May 2020, https://doi.org/10.5194/egusphere-egu2020-3020, 2020

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