Fig. 3 Nitrogen dynamics in the soils before (open bars) and after 1 d (shaded bars) and 2 d (black bars) of glucose additions. Dw denotes denitrification of infiltrated NO^-₃, and Dn the coupled nitrification–denitrification. Rates are expressed in mmol m^-2 d^-1, except humic content which is measured as absorbance at 430 nm. Asterisks indicate 5% (*), 1% (**) and 0.1% (***) levels of significance between the different glucose–time treatments

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