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Global stocks and capacity of mineral-associated soil organic carbon

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 r...

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Autores principales: Georgiou, Katerina, Jackson, Robert B., Vindušková, Olga, Abramoff, Rose Z., Ahlström, Anders, Feng, Wenting, Harden, Jennifer W., Pellegrini, Adam F. A., Polley, H. Wayne, Soong, Jennifer L., Riley, William J., Torn, Margaret S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9249731/
https://www.ncbi.nlm.nih.gov/pubmed/35778395
http://dx.doi.org/10.1038/s41467-022-31540-9
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author Georgiou, Katerina
Jackson, Robert B.
Vindušková, Olga
Abramoff, Rose Z.
Ahlström, Anders
Feng, Wenting
Harden, Jennifer W.
Pellegrini, Adam F. A.
Polley, H. Wayne
Soong, Jennifer L.
Riley, William J.
Torn, Margaret S.
author_facet Georgiou, Katerina
Jackson, Robert B.
Vindušková, Olga
Abramoff, Rose Z.
Ahlström, Anders
Feng, Wenting
Harden, Jennifer W.
Pellegrini, Adam F. A.
Polley, H. Wayne
Soong, Jennifer L.
Riley, William J.
Torn, Margaret S.
author_sort Georgiou, Katerina
collection PubMed
description 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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spelling pubmed-92497312022-07-03 Global stocks and capacity of mineral-associated soil organic carbon Georgiou, Katerina Jackson, Robert B. Vindušková, Olga Abramoff, Rose Z. Ahlström, Anders Feng, Wenting Harden, Jennifer W. Pellegrini, Adam F. A. Polley, H. Wayne Soong, Jennifer L. Riley, William J. Torn, Margaret S. Nat Commun Article 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. Nature Publishing Group UK 2022-07-01 /pmc/articles/PMC9249731/ /pubmed/35778395 http://dx.doi.org/10.1038/s41467-022-31540-9 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Georgiou, Katerina
Jackson, Robert B.
Vindušková, Olga
Abramoff, Rose Z.
Ahlström, Anders
Feng, Wenting
Harden, Jennifer W.
Pellegrini, Adam F. A.
Polley, H. Wayne
Soong, Jennifer L.
Riley, William J.
Torn, Margaret S.
Global stocks and capacity of mineral-associated soil organic carbon
title Global stocks and capacity of mineral-associated soil organic carbon
title_full Global stocks and capacity of mineral-associated soil organic carbon
title_fullStr Global stocks and capacity of mineral-associated soil organic carbon
title_full_unstemmed Global stocks and capacity of mineral-associated soil organic carbon
title_short Global stocks and capacity of mineral-associated soil organic carbon
title_sort global stocks and capacity of mineral-associated soil organic carbon
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9249731/
https://www.ncbi.nlm.nih.gov/pubmed/35778395
http://dx.doi.org/10.1038/s41467-022-31540-9
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