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Fig. 1. (A) Initial NH4+ and NO3– pools, and (B) percentage of 15N recovery in the labeled pools 15 min (T0) after 15N injection in the intact cores. Means (bars for standard errors; n = 4) of either NH4+ or NO3– pools without letter or with the same letter indicate no significant difference among land use types at each location (One-way ANOVA, Least Significant Difference test at P 
0.05). (n.d. = not detectable). * indicates significant difference between NH4+ and NO3– pools and between 15NH4+ and 15NO3– recoveries at each land use type and location (Independent t test at P 0.05).
