Summary
This study elucidates the mechanisms by which organic soil amendments enhance carbon storage by increasing the availability of short-range-ordered minerals that bind and stabilise organic carbon. Through analysis of three long-term field experiments (spanning 23–170 years) combined with controlled microcosm studies and isotopic labelling, the authors demonstrate that root exudates—particularly citric acid—promote SRO mineral formation, which then act as nucleation sites for persistent carbon retention. The findings suggest that soil organic amendment practices create a positive feedback loop for carbon sequestration, with potential applications for enhancing soil carbon management.
UK applicability
These findings are relevant to UK soil carbon enhancement strategies, particularly for organic farming systems and agricultural carbon sequestration initiatives. The long-term field experiments provide evidence applicable to temperate climates, though UK-specific field validation would strengthen recommendations for domestic practice and policy.
Key measures
Mineral availability (particularly SRO phases), soil carbon storage, root exudate composition (citric acid), mineral transformation rates, and isotopic labeling of carbon retention
Outcomes reported
The study quantified how organic amendments increase mineral availability and promote formation of short-range-ordered (SRO) mineral phases, and demonstrated the role of root exudates in this process. The research provided evidence that SRO minerals act as nucleation sites for carbon retention in soil.
Topic tags
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