3.3 Climate and burn extent effects
We found a lack of significance of climate on the effect size for nitrate (lmer : p-value < 0.05; Fig. 3, Table S3) suggesting a limited effect of climate on nitrate concentrations post-fire. Similarly to time-since-fire, the variability significantly differed across climate classifications for nitrate (Levene’s test; F-value: 2.89, df: 7,88, p-value: < 0.05, Fig. S11). Cold semi-arid and hot-mediterranean, represented as BSk and Csa respectively, displayed higher variability compared to the other climate classifications (Fig. S11). Likewise, we found no significant effect of climate on the effect size for DOC (lmer : p-value: > 0.05; Fig. 3, Table S4). However, we did find evidence to support that the variability across climate guilds was significantly different from each other, as Csa (Hot-Mediterranean) showed the greatest variability (Levene’s test: F-value: 66.81, df: 4, 44, p-value: < 0.05, Fig. S12). Even though burn percentages ranged from ~ 2% to 100%, burn percentage did not significantly influence nitrate (lmer : p-value > 0.05; Fig. 4, Table S5) or DOC (lmer : p-value: > 0.05; Fig. 4, Table S6).