Menyailo, OV; Huwe, B: Denitrification and C, N mineralization as function of temperature and moisture potential in organic and mineral horizons of an acid spruce forest soil, Journal of Plant Nutr. Soil Sci., 162, 527-531 (1999)
Abstract:
The influence of temperature (T) and water potential (PSI) on the denitrification potential, C and N mineralization and nitrification were studied in organic and mineral horizons of an acid spruce forest soil. The amount of N2O emitted from organic soil was 10 times larger than from the mineral one. The maximum of N2O emission was in both soils at the highest water potential 0 MPa and 20°C. CO2 production in the organic soil was 2 times higher than in mineral soil. Net ammonification in organic soil was negative for most of the T-PSI variations, while in mineral soil it was positive. Net nitrification in organic soil was negative only at the maximum water potential and temperature (0MPa, 28°C). The highest rate was between 0 and -0.3 MPa and between 20 and 28°C. In mineral soil NO3- accumulated at all T-y variations with a maximum at 20°C and -0.3 MPa. We concluded that in organic soil the immobilization of NH4+ is the dominant process in the N-cycling. Nevertheless, decreasing of total N mineralized at 0 MPa and 20-28°C can be explained by denitrification.
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