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Fig. 3. Variation in pH (standard units) and exchangeable Ca, Mg, and Al (cmol_c kg ^–1) in the Oa/A horizon at each of the four study sites, and for all sites combined. The value for the 1967 pits represents a single measurement. The bars represent the mean and standard error of measurements for the 1997 pits (n = 4 per site) and pin-blocks (n = 10 per site, per year). DD, Dewdrop, FC, Fools Creek; HC, Hearts Content; NB, North Branch.