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Fig. 6. Measured NO-3concentrations on an areal basis versus NO-3 predicted from multiple regression models in the form of Eq. [1] with 
= 2, using (a) landscape factors, (b) landscape factors and soil chemical properties, and (c) landscape factors, soil chemical properties, and microbial process rates. Regression coefficients (ai) shown for each independent variable (Ai) in order of decreasing importance to overall model. El = elevation (m); S = Southness; BF = balsam fir basal area; StM = striped maple basal area; BA = total basal area (m2 ha-1); C/N = kg C kg -1 N on areal basis; Mr = net N mineralization rate (kg N ha-1 d-1); * signifies p < 0.05; ** signifies p < 0.01; *** signifies p < 0.001.
