Deciphering the Intricate Control of Minerals on Deep Soil Carbon Stability and Persistence in Alaskan Permafrost

ABSTRACT Understanding the fate of organic carbon in thawed permafrost is crucial for predicting climate feedback. While minerals and microbial necromass are known to play crucial roles in the long‐term stability of organic carbon in subsoils, their exact influence on carbon persistence in Arctic pe...

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Bibliographic Details
Published in:Global change biology 2024-10, Vol.30 (10), p.e17552-n/a
Main Authors: Guo, Yi‐Xuan, Yu, Guang‐Hui, Hu, Shuijin, Liang, Chao, Kappler, Andreas, Jorgenson, Mark Torre, Guo, Laodong, Guggenberger, Georg
Format: Article
Language:English
Subjects:
Alaska
Arctic region
Arctic Regions
Biomarkers
Biopolymers
Carbon
Carbon - analysis
Carbon 13
Carbon isotopes
carbon radioisotopes
Climate
Climate prediction
Control stability
Correlation
Correlation coefficient
Correlation coefficients
Destabilization
Functional groups
global change
Infrared spectra
Infrared spectroscopy
Iron
microbial necromass
microbial residues
Microorganisms
mineral binding sites
Minerals
Minerals - analysis
Moisture
Moisture content
nanozyme
necromass
Organic carbon
Organic soils
Permafrost
Peroxidase
Polysaccharides
Predictive control
protective effect
Radiocarbon dating
Radiometric dating
reactive minerals
Saccharides
Soil
Soil - chemistry
Soil aggregates
Soil analysis
soil carbon accrual
Soil Microbiology
Soil microorganisms
soil organic carbon
Soils
Stability
Subsoils
Synchrotron radiation
μ‐FTIR
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Summary:ABSTRACT Understanding the fate of organic carbon in thawed permafrost is crucial for predicting climate feedback. While minerals and microbial necromass are known to play crucial roles in the long‐term stability of organic carbon in subsoils, their exact influence on carbon persistence in Arctic permafrost remains uncertain. Our study, combining radiocarbon dating and biomarker analyses, showed that soil organic carbon in Alaskan permafrost had millennial‐scale radiocarbon ages and contained only 10%–15% microbial necromass carbon, significantly lower than the global average of ~30%–60%. This ancient carbon exhibited a weak correlation with reactive minerals but a stronger correlation with mineral weathering (reactive iron to total iron ratio). Peroxidase activity displayed a high correlation coefficient (p 
ISSN:1354-1013
1365-2486
1365-2486
DOI:10.1111/gcb.17552