where CS is the amount of CO2-C evolved from the control soil, CT is the
total C mineralized from the biochar-amended soil, CB is the amount of C
mineralized from biochar. The positive priming effect means accelerating
of SOC mineralization by biochar. In contrast, negative priming effect
means the suppression of SOC mineralization by biochar.
Cumulative biochar degradation was calculated. Furthermore, to
eliminate the impact of soil SOC content on biochar degradation, the
mineralization rate of biochar as per unit native SOC were used to
describe the degradation of biochar in different soils.