Nitrogen addition-driven soil organic carbon stability depends on the fractions of particulate and mineral-associated organic carbon

Nitrogen (N) deposition greatly affects soil carbon (C) fractions, triggering changes in soil organic carbon (SOC) persistence and functionality. However, the responses of soil C fractions to N deposition remain unclear on a global scale. Here, we conducted a meta-analysis of 69 publications and explored the response of C fractions (particulate organic carbon, POC; mineral-associated organic carbon, MOC) to N addition. Our findings reveal that N addition significantly increases the particulate organic carbon (POC) and mineral-associated organic carbon (MOC) pools (32.3