FIGURE 2.

Dynamics of ¹³C tracer incorporation into extractable organic carbon (EOC; circles; A,C) and microbial biomass carbon (MBC; squares; B,D) from soil of control (closed symbols and solid lines) and drought-treated (open symbols and dashed lines) mesocosms at the peak drought (A,B) and recovery (C,D) labeling campaigns. Error bars show the SE of n = 6 mesocosms. Levels of significance for time after labeling (t; df = 3), drought treatment (D; df = 1) and the interaction of both (D × t; df = 3) were obtained from linear mixed-effects (lme) models using the R package ‘lme4’; ^∗∗∗P_χ² < 0.001, ^∗∗P_χ² < 0.01, ^∗P_χ² < 0.05. Note that the labeling time was 30 min at the recovery labeling compared to 75 min at the peak drought labeling and that the absolute values cannot be compared between the labeling campaigns.