Cited by 979Soil Carbon and Nitrogen DynamicsSoil Geostatistics and MappingSoil erosion and sediment transport

Global stocks and capacity of mineral-associated soil organic carbon

Open access
Georgiou, Katerina, Jackson, Robert B., Vindušková, Olga, Abramoff, Rose Z., Ahlström, Anders, Feng, Wenting, Harden, Jennifer W., Pellegrini, Adam F. A. +4 more·2022·Nature Communications

Abstract

Soil is the largest terrestrial reservoir of organic carbon and is central for climate change mitigation and carbon-climate feedbacks. Chemical and physical associations of soil carbon with minerals play a critical role in carbon storage, but the amount and global capacity for storage in this form remain unquantified. Here, we produce spatially-resolved global estimates of mineral-associated organic carbon stocks and carbon-storage capacity by analyzing 1144 globally-distributed soil profiles. We show that current stocks total 899 Pg C to a depth of 1 m in non-permafrost mineral soils. Although this constitutes 66% and 70% of soil carbon in surface and deeper layers, respectively, it is only 42% and 21% of the mineralogical capacity. Regions under agricultural management and deeper soil layers show the largest undersaturation of mineral-associated carbon. Critically, the degree of undersaturation indicates sequestration efficiency over years to decades. We show that, across 103 carbon-accrual measurements spanning management interventions globally, soils furthest from their mineralogical capacity are more effective at accruing carbon; sequestration rates average 3-times higher in soils at one tenth of their capacity compared to soils at one half of their capacity. Our findings provide insights into the world’s soils, their capacity to store carbon, and priority regions and actions for soil carbon management.

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  • Most agricultural soils-particularly those with a history of degradation-remain far below the SOC saturation threshold.

    “Although SOC saturation represents a theoretical upper limit, most agricultural soils—particularly those with a history of degradation—remain far below this threshold (Georgiou et al., 2022;Georgiou et al., 2025;Sanderman et al., 2017).”

    From Impact of 10 years of adaptive multi-paddock grazing on soil carbon and beef's greenhouse gas footprint in the US Upper Midwest (2026) · cites this paper as Georgiou et al., 2022

    In Results and discussion, the paper reports that agricultural systems averaged 31 ± 2% saturation and that most current and abandoned agricultural lands are considerably below their mineralogical carbon capacity, consistent with the claim about degraded agricultural soils. The qualification is that the paper measures saturation of mineral-associated organic carbon, not total SOC, and its estimated capacity is not an absolute upper limit: some soils exceed it. (LLM, conf=0.84)

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Research works printed but not linked: 2

  1. Torn, M. S., Trumbore, S. E., Chadwick, O. A., Vitousek, P. M. & Hendricks, D. M. Mineral control of soil organic carbon storage and turnover. Nature 3603, 3601–3603 (1997).
  2. Liaw, A. & Wiener, M. Classification and Regression by randomForest. R. N. 2(3), 18–22 (2002).

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Authors
Georgiou, K., Jackson, R. B., Vindušková, O., Abramoff, R. Z., Ahlström, A., Feng, W., Harden, J. W., Pellegrini, A. F. A., Polley, H. W., Soong, J. L., Riley, W. J., & Torn, M. S.
Affiliations
  • Lawrence Livermore National Laboratory (US)
  • Stanford University (US)
  • University of Antwerp (BE)
  • Oak Ridge National Laboratory (US)
  • Lund University (SE)
  • Chinese Academy of Agricultural Sciences (CN)
  • United States Geological Survey (US)
  • University of Cambridge (GB)
  • Agricultural Research Service (US)
  • Colorado State University (US)
  • Lawrence Berkeley National Laboratory (US)
Corresponding author
Georgiou, Katerina
Venue
Nature Communications
Published
2022-07-01
Volume
13
Issue
1
Pages
3797-3797
ISSN
2041-1723 (ISSN-L)
OpenAlex
W4283743401
Cited by
979
References
119
Citations by year
2026: 322 · 2025: 299 · 2024: 213 · 2023: 125 · 2022: 20
FWCI
88.54
Type
journal article
Language
en
Open access
Locations
  • Nature Communications (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, cc-by)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • Lund University Publications (Lund University) (submittedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • Apollo (University of Cambridge) (submittedVersion, cc-by)
  • Apollo
  • Apollo (cc-by)
  • Greater South Information System
Funders
DOE | LDRD | Lawrence Livermore National Laboratory (21-ERD-045)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
  • Physical Sciences › Environmental Science › Environmental Engineering › Soil Geostatistics and Mapping
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil erosion and sediment transport
Keywords
mineral-associated organic carbon, soil organic carbon stocks, carbon storage capacity, carbon sequestration, soil carbon management, agricultural soils, soil depth, carbon-climate feedback
MeSH terms
Agriculture, Carbon, Minerals, Soil, Carbon Sequestration

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