Global stocks and capacity of mineral-associated soil organic carbon.

Autor: Georgiou K; Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94551, USA. georgiou1@llnl.gov.; Department of Earth System Science, Stanford University, Stanford, CA, 94305, USA. georgiou1@llnl.gov., Jackson RB; Department of Earth System Science, Stanford University, Stanford, CA, 94305, USA.; Woods Institute for the Environment, Stanford University, Stanford, CA, 94305, USA.; Precourt Institute for Energy, Stanford University, Stanford, CA, 94305, USA., Vindušková O; Department of Biology, University of Antwerp, Antwerp, 2000, Belgium.; Institute for Environmental Studies, Charles University, Prague, 128 01, Czech Republic., Abramoff RZ; Laboratoire des Sciences du Climat et de l'Environnement, Gif-sur-Yvette, F-91191, France.; Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA., Ahlström A; Deptartment of Physical Geography and Ecosystem Science, Lund University, Lund, SE-22100, Sweden., Feng W; Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 10081, China., Harden JW; Department of Earth System Science, Stanford University, Stanford, CA, 94305, USA.; U.S. Geological Survey, Menlo Park, CA, 94035, USA., Pellegrini AFA; Department of Plant Sciences, University of Cambridge, Cambridge, CB2 3EA, UK.; Cambridge Conservation Institute, University of Cambridge, Cambridge, CB2 3EA, UK., Polley HW; Agricultural Research Service, U.S. Department of Agriculture, Temple, TX, 76502, USA., Soong JL; Department of Ecosystem Science and Sustainability, Colorado State University, Fort Collins, CO, 80523, USA.; Granular, Inc, San Francisco, CA, 94103, USA., Riley WJ; Climate and Ecosystem Sciences, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA., Torn MS; Climate and Ecosystem Sciences, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.; Energy and Resources Group, University of California, Berkeley, Berkeley, CA, 94720, USA.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2022 Jul 01; Vol. 13 (1), pp. 3797. Date of Electronic Publication: 2022 Jul 01.
DOI: 10.1038/s41467-022-31540-9
Abstrakt: 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.
(© 2022. The Author(s).)
Databáze: MEDLINE
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