Fig. 4. Mean annual riparian ground water denitrification rates versus weighted average soil carbon content at (a) 65 cm and (b) 150 cm below the soil surface. Spearman rank correlations between denitrification rates and the weighted average of % C in samples from horizons at (a) 55 to 75 cm and (b) 140 to 160 cm below the soil surface were not significant. Error bars signify ±1 SE (n = 6).