Fig. 3From: Different responses of soil respiration and its components to nitrogen and phosphorus addition in a subtropical secondary forestEffects of nitrogen and phosphorus additions on soil enzyme activity in 2014 and 2015. Vertical bars represent the standard error of the mean (n = 4). CK, control; N, nitrogen addition; P, phosphorus addition; NP, both nitrogen and phosphorus addition. Two-way ANOVA shows the effects of N and P addition on soil enzymes activityBack to article page