only marginally significantP < 0.1
Concentrations of C and N in soil and microbial biomass In the mixed heath soil, the concentrations of NH + 4 , NO − 3 , DOC, and DON in the soil mesocosms were 43–67% lower than the concentrations in the control mesocosms, although the difference for NH + 4 was only marginally significant (0.05 < P < 0.1, Tukey's HSD; Table 3 ).