Fig. 2. Depth distribution of soil organic C, N, and C/N ratio. Each master horizon was analyzed in a separate ANOVA. Error bars are 95% confidence limits of the least square mean (1.96SEM) back–transformed to original scale. Identical lower case letters indicate that master horizons in different soil orders are not significantly different at the 95% probability level. Estimates represent group medians on original scale (Parkin and Robinson, 1994).