Figure 1.

Mean contents of soil organic carbon (SOC) (a), dissolved organic carbon (DOC) (b), particulate organic carbon (POC) (c), KMnO₄-oxidized organic carbon (EOC) (d), soil inorganic carbon (SIC) (e), and aggregate content ration (f) in the different treatments. Different letters indicate significant differences between the treatments and control (p < 0.05). CK: control; BC: Bacillus clausii; B: biochar; FeB: Fe-modified biochar; BBC: biochar combined with Bacillus clausii; FeBBC: Fe-modified biochar combined with Bacillus clausii.