Figure 2.

Model estimated effects of MAT on microbial respiration without and with substrate addition; (a) and (b) for the dataset from this study; (c) and (d) for the dataset from Bradford et al. [18]; (e) and (f) for the dataset from Dacal et al. [31]; microbial respiration rates (points) were estimated using the unstandardized coefficients from models given in Table 1, by increasing MAT and incubation temperature values in the regression equation systematically from the lowest to highest values observed in each study, and the values of the other variables (microbial biomass and soil texture) were held as the averages across all sites; the shaded areas show the standard deviation of potential soil microbial respiration rates at each incubation temperature (T).