Summary
The addition of exogenous organic carbon (C) to soil can either accelerate or retard the soil organic carbon (SOC) mineralization, i.e., the priming effect (PE), which plays a crucial role in SOC sequestration and thus is significant in the context of global warming. However, the influence of exogenous organic C quality on PE remains poorly understood, potentially limiting our understanding of SOC dynamics. Thus, we conducted a global meta-analysis to reveal the effect of exogenous organic C quality on PE through compiling a data set of 2031 experiment trials. Our results revealed that the addition of organic C significantly enhanced SOC decomposition by 46.23 % in agricultural soils. Labile C compounds induced a stronger PE than both intermediate and recalcitrant C compounds. Organic C ma
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