Fig. 4. (A) Means with standard errors for 16 mo cumulative release of NH⁺₄ (g N kg^-1 soil N) from mineral soil sampled from pine and aspen stands during the four leaching events (n = 6); (B) Cumulative release of NO^-₃ (g N kg^-1 soil N); (C) Cumulative release of total mineral N (g N kg^-1 soil N).

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