In a laboratory incubation experiment, nitrification potential, methane oxidation, N2O and CO2 release were studied in the organic soil layer (0-10 cm) of field lysimeters containing reestablished soil profiles from a 100-year-old Scots pine (Pinus sylvestris) forest of Norway. The experiment was designed as a full factorial (3 factors; N fertilisation rates, soil acidification, and plants), with three replicates. The more acidic irrigation (pH 3) significantly reduced nitrification potential and N2O fluxes, methane oxidation and CO2 release. We concluded that the reduction in soil N2O release by severe acid deposition is partly due to reduction in nitrification potential. The highest N2O fluxes were observed in the combination of fertilised planted and less acidic pH treatment. N fertilisation (90 kg N ha-1 y-1 with NH4NO3) increased soil N2O release by a factor of 8 and decreased CH4 oxidation by 60–80% . Plant effects on soil nitrification potential and methane oxidation rates are discussed.
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- Nitrification and Methane Oxidation in Forest Soil: Acid Deposition, Nitrogen Input and Plant Effects
B. K. Sitaula
J. I. B. Sitaula
L. R. Bakken
- Springer Netherlands