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Fig. 1. Effects of vegetation type and topographic position on average (+1 SE) gross rates of production and immobilization of NH₄⁺–N and NO₃^––N in surface soils (0–15 cm). Differences among means were significant only for NO₃^––N production; bars capped by a common lowercase letter were not significantly different (Tukey HSD test, ${alpha}$ set at 0.05).