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Figure S1 Spatial distribution of major biomes across the globe.

Figure S2 Histograms showing frequency of soil elements.

Figure S3 Histograms showing frequency of soil microbial biomass C, N and P.

Figure S4 Histograms showing frequency of ratios between soil elements.

Figure S5 Histograms showing frequency of ratios between soil microbial biomass C, N and P.

Figure S6 Box and scatter charts showing distributions and magnitudes of C, N and P in microbial biomass and soil and fractions of soil nutrient in soil microbial biomass.

Figure S7 Box and scatter charts showing distributions and magnitudes of C, N and P in microbial biomass and soil and fractions of soil nutrient in soil microbial biomass in 11 major biomes.

Figure S8 Observed versus retrieved climate variables for the sampling sites.

Figure S9 Scatterplot showing soil organic C and soil microbial biomass C along latitude.

Figure S10 Scatterplot showing soil organic N and soil microbial biomass N along latitude.

Figure S11 Scatterplot showing soil organic P and soil microbial biomass P along latitude.

Figure S12 C:N ratios for soil elements and soil microbial biomass along latitude.

Figure S13 C:P ratios for soil elements and soil microbial biomass along latitude.

Figure S14 N:P ratios for soil elements and soil microbial biomass along latitude.

Table S1 The values of parameters describing vertical distribution of soil microbial biomass C and N in soil profile.

Table S2 Values of parameters used to estimate global soil microbial biomass C and N (standard errors in the brackets; N is the numbers of data points used in multiple linear regression).

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