Fig. 3

Response of SOC and MBC to a sustained doubling of C inputs in the two-pool microbial model with and without density-dependent microbial turnover. a Percent change of modeled SOC following a 2× step increase in total C inputs. b Percent change of modeled MBC following a 2× step increase in total C inputs. The value of the parameter β depicts the strength of density-dependent microbial turnover, where β = 1 corresponds to no density-dependence and β = 2 to a strong density-dependence