固碳
土壤碳
环境科学
土壤水分
碳纤维
永久冻土
总有机碳
土壤科学
气候变化
土壤有机质
地质学
环境化学
二氧化碳
生态学
化学
材料科学
海洋学
复合数
复合材料
生物
作者
Katerina Georgiou,Robert B. Jackson,Olga Vindušková,Rose Abramoff,Anders Ahlström,Wenjie Feng,J. W. Harden,Adam F. A. Pellegrini,H. Wayne Polley,Jennifer L. Soong,William J. Riley,M. S. Torn
标识
DOI:10.1038/s41467-022-31540-9
摘要
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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