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Global stocks and capacity of mineral-associated soil organic carbon

المخزونات العالمية وقدرة الكربون العضوي في التربة المرتبط بالمعادن
Authors: Katerina Georgiou; Robert B. Jackson; Olga Vindušková; Rose Abramoff; Anders Ahlström; Wenjie Feng; J. W. Harden; +5 Authors

Global stocks and capacity of mineral-associated soil organic carbon

Abstract

AbstractSoil 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.

Countries
United Kingdom, France, Belgium, United States
Keywords

Carbon sequestration, 550, Permafrost, /704/106/47/4113, Carbon Dynamics in Peatland Ecosystems, Digital Soil Mapping Techniques, Oceanography, Agricultural and Biological Sciences, Soil, Soil water, Carbon fibers, Climate change, Minerals, Ecology, Forestry Sciences, Q, Total organic carbon, article, Life Sciences, Composite number, Geology, Agriculture, /704/106/694/682, Soil carbon, Chemistry, /704/47/4113, CESD-Soil Quality, Physical Sciences, Environmental chemistry, Engineering sciences. Technology, Composite material, /141, Carbon Sequestration, Environmental Engineering, Life on Land, Science, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Veterinary and Food Sciences, Soil Science, /704/106/694/1108, 333, Environmental science, Article, Digital Soil Mapping, [SDU] Sciences of the Universe [physics], Global Soil Information, Soil Carbon Sequestration, Biology, Soil science, Agricultural, Soil organic matter, FOS: Environmental engineering, Soil Properties, FOS: Earth and related environmental sciences, Materials science, Carbon, Carbon dioxide, [SDU]Sciences of the Universe [physics], FOS: Biological sciences, Environmental Science, [SDU.STU] Sciences of the Universe [physics]/Earth Sciences, Soil Carbon Dynamics and Nutrient Cycling in Ecosystems, /119, Climate Change Impacts and Adaptation, Environmental Sciences

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