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Fig. 4. Net nitrification rates (NR) and NO-3–N concentrations determined in soils stored at 4°C for 1 to 3 d following field collection in plots comprised of 50% or more basal area of a single species. RS = red spruce; BF = balsam fir; AB = American beech; YB = yellow birch; SM = sugar maple; PB = paper birch. Species with the same letter designations for each parameter are not significantly different (p > 0.05), using least significant differences multiple range test. Coefficients of variation (CV) values are tabulated.
