Figure 3

Soil microbial biomass C (MBC) in 0–5, 5–10, 10–20 cm soil layers in plots of contrasting forest types and stand age classes 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/stand age classes for each sampling time (P < 0.05).