In acidic soils, biochar addition initially (first 7 days) accelerated the
SOC mineralization. The application of the low-temperature-pyrolyzed
biochar induced more drastically positive priming effect than the
high-temperature-pyrolyzed biochar (Fig. 3a). Co-metabolism and liming
effect were considered to be the main reasons for the priming effects
in acidic soils. Since biochar C pyrolyzed at lower temperature
contained higher volatile matter, which was more easily mineralized
and resulted in increased microbial biomass and the simultaneous increase
in enzyme production (Blagodatskaya and Kuzyakov, 2008;
Keith et al., 2011; Kuzyakov et al., 2009). The lag phase and lower priming
effect of 300BC amended soils within 7 days introduced another