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Carbon distribution between density and particle size classes of differently managed soils in a 40-year agronomic long-term trial

Mayer, Marius; Fliessbach, Andreas; Mäder, Paul and Steffens, Markus (2021) Carbon distribution between density and particle size classes of differently managed soils in a 40-year agronomic long-term trial. In: EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-9801, https://doi.org/10.5194/egusphere-egu21-9801, 2021, EGU General Assembly 2021.

[thumbnail of Abstract] PDF - English (Abstract)
Available under License Creative Commons Attribution.


Document available online at: https://meetingorganizer.copernicus.org/EGU21/EGU21-9801.html


Soils contain more carbon (C) in the form of organic matter (soil organic matter = SOM) than the entire atmosphere and global vegetation combined. They are a central component of the global C cycle and its largest dynamic reservoir. Smart agricultural practices are discussed, on the one hand, as a way to mitigate climate change because they can increase the amount of SOM and thus actively remove C from the atmosphere. On the other hand, all intensively used soils lose C in the long term. The scientific key questions in this context revolve around the extent and dynamics of C storage, as well as the associated stabilization mechanisms involved and effects of agricultural use on the C budget.The DOK experiment is a long-term agronomic field trial near Basel (Switzerland) that compares biodynamic, organic and conventional management systems since 40 years. Within the "DynaCarb" project, we investigate how the management systems affect SOM fractions during the 40-year experimental period. We compare the unfertilized control to a purely mineral, a purely organic, and a combined fertilized, mineral-organic variant (four field replicates each) during six crop rotation cycles. By using a combined density and particle size fractionation, the SOM is separated into particulate and mineral-associated fractions and their development is quantitatively investigated in archived samples from 1982, 1989, 1996, 2003, 2010, and 2017."DynaCarb" investigates the medium- and long-term effects of different agricultural systems on SOM. These results are of great importance for the evaluation of the C sequestration potential of agricultural soils and for the identification of suitable management and fertilization strategies.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:soil fertility, carbon, long-term experiments, DOK, Bodenwissenschaften, Abacus, FiBL10125, DynaCarb
Agrovoc keywords:
soil fertility
long-term experiments
Subjects: Soil > Soil quality
Knowledge management > Research methodology and philosophy > Systems research and participatory research
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Crops > Field trials > DOK Trial
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil > Soil fertility
Related Links:https://www.fibl.org/en/themes/projectdatabase/projectitem/project/1544
Deposited By: Forschungsinstitut für biologischen Landbau, FiBL
ID Code:43139
Deposited On:04 Jan 2022 11:40
Last Modified:22 Apr 2022 07:57
Document Language:English
Refereed:Peer-reviewed and accepted

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