Soil organic carbon (SOC) sequestration is the transfer of CO2 from the atmosphere into soil organic matter. It, therefore, relies on photosynthesis and plant-derived carbon (C) input, which usually occurs through biomass production. Janzen et al. (2022) reminded us that when calculating SOC sequestration potential, we should recognise the source of C input to the soil as estimated by Net Primary Production (NPP). Indeed, increasing plant biomass production via NPP has been discussed as the most important driver of many SOC sequestration strategies (Soussana et al., 2019).
BM, JP, and PS acknowledge the support of the Australian Research Council (ARC) Discovery project DP200102542, Forecasting Soil Conditions. BM, BH, L-SK, JL, CR, J-FS are members of the scientific and technical committee of the 4 per mille initiative. BM and DA are members of the GLADSOILMAP research consortium supported by LE STUDIUM Institute for Advanced Research Studies, France. AMcB acknowledges the support of an ARC Laureate Fellowship on Soil Security.