Deep-soil DOM responses to warming and N addition

This dataset was generated from a 15-year in situ field warming experiment at the Luancheng Agro-Ecosystem Experimental Station, North China Plain, China. A 2 × 2 factorial design with warming (+1.5°C, infrared heating), nitrogen addition, and three replicates was used to examine dissolved organic matter (DOM) responses across soil depths, with emphasis on deep soil (80–100 cm). The dataset includes DOM concentration and spectral properties (EEM-FRI, FTIR), soil inorganic N, microbial biomass carbon, respiration, enzyme activities, rhizosphere metabolomics, and Fe-based proxy indices of mineral protection.