Potential extracellular enzyme activity at a soil depth of 0–10 cm in control and fertilized plots measured in 2012.

<p>Significant differences among nitrogen (N) treatments are indicated by different letters. AG = α-glucosidase; BG = β-1,4-glucosidase; CB = β-D-cellobiosidase; XS = xylosidase; NAG = N-acetyl-glucosaminidase; AP = acid phosphatase; LAP = leucine aminopeptidase.