Fig. 1. (a) Gross N immobilization rate (GI) vs. respiration rate (R). (b) Gross N mineralization rate (GM) vs. respiration rate (R). (c) Net N mineralization rate (NMD) vs. respiration rate (R). (d) gross N mineralization rate vs. respiration rate (R) divided by the C to N ratio (Z) of the plant materials. The regressions are based on data from all three incubation periods. Error bars show standard error (n = 3).