Figure 5. Boxplot of slope b under different land use conditions. The slope b was calculated from multiple years of low-frequency concentration and discharge data and high-frequency data averaged to daily values so the focus here is not event-based C-Q (see Detailed Methods). The gray dashed lines are thresholds separating flushing (b>0.1) and dilution patterns (b<-0.1) from the chemostatic pattern, using b = 0.1 and =0.1 as thresholds (Herndon et al., 2015; Hoagland et al., 2017). The gray numbers are the fractions of flushing, chemostatic, and dilution patterns. Two-sample t -tests were performed for statistical analysis: the single star marker indicates statistical significance at the level of 0.05, and the double star maker indicates statistical significance at the level of 0.01.