Soil CO₂ concentrations and flux.

<p>Comparison of mean CO₂ concentrations across three depths and flux between and within upland (n = 23) and riparian (n = 9) plots during wet (Weeks 1–3), transition (Weeks 4–6), and dry (Weeks 7–9) periods of the 2013 growing season. Asterisks (*) indicate significant differences between groups (p<0.05, Welch’s ANOVA). Bars indicate standard errors of the mean.