Fig. 4
Percent changes in microbial necromass C under different magnitudes (upper) and durations (lower) of N addition. a, d Total microbial necromass C, b, e fungal necromass C, and c, f bacterial necromass C. Error bars represent the 95% bootstrap confidence intervals that were calculated by weighted effect sizes. The responses of these variables to different magnitudes and durations of N addition are considered significant (P < 0.05) if the 95% bootstrap confidence intervals do not overlap with zero. The between-group heterogeneities (Qb) and the probabilities (P) of the effects of N addition on microbial necromass C across different magnitudes and durations are shown in each panel