EGU2020-20653
https://doi.org/10.5194/egusphere-egu2020-20653
EGU General Assembly 2020
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

C stocks and subsoil management in agroecosystems: application of hyperspectral imaging to study organic matter dynamics in the top one metre of soil

Julien Guigue, Christopher Just, Siwei Luo, Eleanor Hobley, and Ingrid Kögel-Knabner
Julien Guigue et al.
  • Technical University of Munich, Research Department Ecology and Ecosystem Management, Freising, Germany (julien.guigue@tum.de)

While the demographic pressure for food demand is continuously rising, global environmental changes are threatening the productivity of agroecosystems. Climatic events like floods or droughts, and long-term decrease in soil organic matter stocks due to intensive agriculture are examples pointing to the necessity to find solutions for sustainable performance of agroecosystems.

Significant amounts of water and nutrients are stored in deep soil horizons, and thus subsoil management is being considered as an alternative to sustain high demand in crop productivity.

We used samples from an ongoing field experiment in Germany where the agricultural management was adapted to investigate the potential benefits of deep ploughing with OM incorporation. We recorded hyperspectral images of soil cores (depth = 1 m) using Vis-NIR reflectance spectroscopy and the C distribution within the soil was modeled at a very high spatial resolution (53×53 μm). The SOC mapping revealed an increase in SOC stocks resulting from deep ploughing, and the high resolution images generated allows the observation of OM distribution in the subsoil and the response in SOM stocks to different types of organic matter incorporation (compost vs green manure). The same imaging technique was also combined with solid-state 13C NMR measurements to track the molecular composition of the organic amendment during decomposition.

Hyperspectral imaging of soil cores allows the quantification of OM stocks and changes at the pedon scale, and fine scale resolution of heterogeneity in the spatial distribution of soil organic matter is helping to understand and quantify the processes related to changes in soil C stocks in subsoils.

How to cite: Guigue, J., Just, C., Luo, S., Hobley, E., and Kögel-Knabner, I.: C stocks and subsoil management in agroecosystems: application of hyperspectral imaging to study organic matter dynamics in the top one metre of soil, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-20653, https://doi.org/10.5194/egusphere-egu2020-20653, 2020.

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