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Macroaggregate disintegration mediates forest gap impacts on MAOC decrease in karst ecosystems
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DOI：10.1016/j.geoderma.2025.117661.png)
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Abstract
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• The study combined aggregate fractionation with biomarker analysis to trace C sources and stability. • Physical breakdown of macroaggregates is the primary mechanism of MAOC loss. • Microbial necromass depletion, not plant inputs, is the critical driver of this C loss. • Protecting soil structure is key to mitigating C loss under increasing forest disturbances.
Keywords:
Forest gap
Mineral-associated organic carbon
Plant-derived carbon
Iron-associated organic carbon
Soil aggregates
Stability mechanisms
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