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).