Fig. 2. The influence of experimental NO3– deposition and site on the activity of (A) phenol oxidase and (B) peroxidase, (C) the concentration of soluble phenolics, and (D) the activity of ß-glucosidase. Enzyme activities are least square means, which are adjusted for differences in soil water content. Asterisk represents significance (p > 0.05) and error bars represent standard error of the mean (n = 18).