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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Vydáno v:	Nature communications Ročník 13; číslo 1; s. 3797
Hlavní autoři:	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.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	London Nature Publishing Group UK 01.07.2022 Nature Publishing Group Nature Portfolio
Témata:	704/106/47/4113 704/106/694/1108 704/106/694/682 704/47/4113 Agricultural and Veterinary sciences Agricultural management Agriculture, Forestry and Fisheries Carbon carbon cycle Carbon sequestration climate and Earth system modeling Climate change Climate change mitigation Earth Sciences ENVIRONMENTAL SCIENCES Estimates GEOSCIENCES Humanities and Social Sciences Jordbruk, skogsbruk och fiske Lantbruksvetenskap och veterinärmedicin Markvetenskap Mineralogy Minerals multidisciplinary Organic carbon Permafrost Science Science (multidisciplinary) Sciences of the Universe soil Soil analysis Soil layers soil organic carbon Soil profiles Soil properties Soil Science Soils Storage capacity
ISSN:	2041-1723, 2041-1723
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Shrnutí:	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. Mineral-organic associations play a key role in soil carbon preservation. Here, Georgiou et al. produce global estimates of mineral-associated soil carbon, providing insight into the world’s soils and their capacity to store carbon
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23 USDA, National Institute of Food and Agriculture (NIFA) LLNL-JRNL-825882 European Union Horizon 2020 AC05-00OR22725; AC52-07NA27344; 793485; 834169; 2018-67012-27982; AC02-05CH11231 USDOE Office of Science (SC), Biological and Environmental Research (BER) USDOE Laboratory Directed Research and Development (LDRD) Program European Union's Horizon 2020
ISSN:	2041-1723 2041-1723
DOI:	10.1038/s41467-022-31540-9