Fig. 1. (a) Effect of biochar on the total CO2 emission and the CO2 release from mineralization of organic carbon at the end of the incubation: (CT − CS)/CS × 100%, where CT-CO2 release of
biochar-amended soil; Cs-CO2 release of control soil. Positive (CT − CS)/CS means increased CO2 release after biochar application, and negative (CT − CS)/CS suggests suppression of CO2
release. (b) Effect of biochar on the inorganic carbon/total carbon (IC/TC) mineralized (%) for six soils on the early stage (7th day) and the end (100th day) of the incubation.