Figure 7. Activities of β-1,4-N-acetylglucosaminidase (NAG) and phenol oxidase (PO) in the 0–5, 5–10, 10–20 cm soil layers in plots of contrasting forest types during the growing seasons in 2011 and 2012.

Error bars represent 1 SE (n = 3). Different letters above the error bars indicate significant differences among forest types for each sampling time (P < 0.05).