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  Management-induced changes in soil organic carbonon global croplands

Karstens, K., Bodirsky, B. L., Dietrich, J. P., Dondini, M., Heinke, J., Kuhnert, M., Müller, C., Rolinski, S., Smith, P., Weindl, I., Lotze-Campen, H., Popp, A. (2022): Management-induced changes in soil organic carbonon global croplands. - Biogeosciences, 19, 21, 5125-5149.
https://doi.org/10.5194/bg-19-5125-2022

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 Creators:
Karstens, Kristine1, Author              
Bodirsky, Benjamin Leon1, Author              
Dietrich, Jan Philipp1, Author              
Dondini, Marta2, Author
Heinke, Jens1, Author              
Kuhnert, Matthias2, Author
Müller, Christoph1, Author              
Rolinski, Susanne1, Author              
Smith, Pete2, Author
Weindl, Isabelle1, Author              
Lotze-Campen, Hermann1, Author              
Popp, Alexander1, Author              
Affiliations:
1Potsdam Institute for Climate Impact Research, Potsdam, ou_persistent13              
2External Organizations, ou_persistent22              

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 Abstract: Soil organic carbon (SOC), one of the largest terrestrial carbon (C) stocks on Earth, has been depleted by anthropogenic land cover change and agricultural management. However, the latter has so far not been well represented in global C stock assessments. While SOC models often simulate detailed biochemical processes that lead to the accumulation and decay of SOC, the management decisions driving these biophysical processes are still little investigated at the global scale. Here we develop a spatially explicit data set for agricultural management on cropland, considering crop production levels, residue returning rates, manure application, and the adoption of irrigation and tillage practices. We combine it with a reduced-complexity model based on the Intergovernmental Panel on Climate Change (IPCC) tier 2 method to create a half-degree resolution data set of SOC stocks and SOC stock changes for the first 30 cm of mineral soils. We estimate that, due to arable farming, soils have lost around 34.6 GtC relative to a counterfactual hypothetical natural state in 1975. Within the period 1975–2010, this SOC debt continued to expand by 5 GtC (0.14 GtC yr−1) to around 39.6 GtC. However, accounting for historical management led to 2.1 GtC fewer (0.06 GtC yr−1) emissions than under the assumption of constant management. We also find that management decisions have influenced the historical SOC trajectory most strongly by residue returning, indicating that SOC enhancement by biomass retention may be a promising negative emissions technique. The reduced-complexity SOC model may allow us to simulate management-induced SOC enhancement – also within computationally demanding integrated (land use) assessment modeling.

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Language(s): eng - English
 Dates: 2022-11-102022-11-10
 Publication Status: Finally published
 Pages: 25
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.5194/bg-19-5125-2022
PIKDOMAIN: RD2 - Climate Resilience
PIKDOMAIN: RD3 - Transformation Pathways
Organisational keyword: RD2 - Climate Resilience
Organisational keyword: RD3 - Transformation Pathways
Working Group: Land-Use Management
Working Group: Land Use and Resilience
MDB-ID: No data to archive
Research topic keyword: Land use
Research topic keyword: Food & Agriculture
Regional keyword: Global
Model / method: MAgPIE
Model / method: LPJmL
Model / method: Open Source Software
Model / method: PIAM
OATYPE: Gold Open Access
 Degree: -

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Project name : Gefördert im Rahmen des Förderprogramms "Open Access Publikationskosten" durch die Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 491075472.
Grant ID : -
Funding program : Open-Access-Publikationskosten (491075472)
Funding organization : Deutsche Forschungsgemeinschaft (DFG)

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Title: Biogeosciences
Source Genre: Journal, SCI, Scopus, p3, oa
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Publ. Info: -
Pages: - Volume / Issue: 19 (21) Sequence Number: - Start / End Page: 5125 - 5149 Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/journals47
Publisher: Copernicus