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The Influence of Organic Carbon on Nitrogen Transformations in Five Wetland Soils

Dep. of Limnology, Ecology Building, Lund Univ., S-223 62 Lund, Sweden

View larger version (32K): [in a new window]   Fig. 1 Design of the soil–water flow-through system

View larger version (31K): [in a new window]   Fig. 2 Nitrogen transformation rates in five soils. Rates are expressed in mmol m-2 d-1, except humic content, which is measured as absorbance at 430 nm. Different letters denote significant differences between soils (P < 0.05)

View larger version (53K): [in a new window]   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