Summary
ABSTRACT Afforestation has been well documented to enhance soil organic carbon (SOC) pools. However, the capacity of soils to mitigate global warming depends critically on SOC persistence, which is fundamentally governed by the accumulation of non‐labile SOC fractions following afforestation. Here, we employed physical fractionation of organic carbon via size/density separation. SOC and its two functionally distinct fractions, particulate organic carbon (POC) and mineral‐associated organic carbon (MAOC), were quantified in corn–soybean rotation fields and pine plantation forests located in two geological backgrounds: clasolite and limestone areas in southwest Guangxi Province, China. The plantation forests were established in former corn–soybean fields 30–40 years ago. Bulk SOC and MAOC co
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