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Fig. 3. Nitrification potential in soils collected from 10 sites along a fire chronosequence in western Montana as influenced by the addition of charcoal (1% w/w). Error bars represent ± one standard error of the mean (n = 4). Bars with similar letters adjacent to them (for each pair of burned and unburned) are not significant different at P < 0.05 as determined using a Tukey's multiple range test.

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