AI Article Synopsis
- Iron oxides interact with soil organic carbon (SOC) to create Fe-bound organic carbon (OC-Fe), which enhances SOC protection and helps combat climate change.
- A meta-analysis of 3,395 soil profiles revealed that global OC-Fe stock in topsoil is 233 PgC, representing about 33% of total SOC.
- Significant OC-Fe deficits were found at the equator and mid-latitudes, suggesting that mineral factors should be included in soil carbon models to enhance predictions and address carbon cycling challenges.
Article Abstract
Iron (Fe) oxides can interact with soil organic carbon (SOC) to form Fe-bound organic carbon (OC-Fe), which strongly promotes SOC protection, mitigating global climate change. However, the global patterns and factors controlling OC-Fe are unclear. Here, we conducted a meta-analysis of 3,395 globally distributed soil profiles to reveal the role of Fe-Al oxides in global soil carbon stabilization and stocks. The global OC-Fe stock in topsoil is 233 PgC, accounting for 33 ± 15% of the total SOC stock. A substantial OC-Fe deficit (difference between OC-Fe and OC-Fe) was observed at the equator and at mid-latitudes. Our findings suggest that mineral factors should be incorporated into soil carbon models to improve model predictions. Although there are uncertainties in current OC-Fe extraction method, the global distribution of OC-Fe and OC-Fe constitutes a vital resource for future research targeting carbon cycling issues and offers innovative strategies for global soil carbon sequestration initiatives.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11605054 | PMC |
| http://dx.doi.org/10.1038/s41467-024-54832-8 | DOI Listing |
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