Molecular Insights into Soil Amendments Regulating Selenium and Cadmium Bioavailability in a Soil-Rapeseed System: Synergistic DOM Transformation and Microbial Metabolic Reprogramming

)-mediated Se/Cd immobilization. These findings demonstrate that amendments regulate Se/Cd bioavailability through DOM-microbe-metabolite interactions. Amendment selection should be based on the Se/Cd bioavailability in the target soil.