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Ratio of predicted to observed annual soil respiration (SRannual) in relation to site aridity, as expressed by (A) the ratio of precipitation to potential evapotranspiration (P/PET) and (B) the number of dry months (P/PET<1). Symbols as in Fig. 4. Regression equations and statistics for (A): SRannual predicted/observed =−0.601 Ln(P/PET)+1.278, R2=0.82, p<0.001; for (B): SRannual predicted/observed =1.92 10−3 x2.823+0.908, where x is the number of months with P/PET<1 (R2=0.78, p<0.001).
