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Denitrification and C, N mineralization as function of temperature and moisture potential in organic and mineral horizons of an acid spruce forest soil
Author(s) -
Menyailo Oleg V.,
Huwe Bernd
Publication year - 1999
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/(sici)1522-2624(199910)162:5<527::aid-jpln527>3.0.co;2-#
Subject(s) - mineralization (soil science) , environmental chemistry , denitrification , chemistry , moisture , nitrogen cycle , soil science , soil water , environmental science , nitrogen , organic chemistry
The influence of temperature (T) and water potential (ψ) 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 N 2 O emitted from organic soil was 10 times larger than from the mineral one. The maximum of N 2 O emission was in both soils at the highest water potential 0 MPa and at 20°C. CO 2 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‒ψ variations, while in mineral soil it was positive. Net nitrification in organic soil was negative only at the maximum water potential and temperature (0 MPa, 28°C). The highest rate was between 0 and −0.3 MPa and between 20 and 28°C. In mineral soil NO 3 − accumulated at all T‒ψ variations with a maximum at 20 o C and −0.3 MPa. We concluded that in organic soil the immobilization of NH 4 + is the dominant process in the N‒cycling. Nevertheless, decreasing of total N mineralized at 0 MPa and 20—28 o C can be explained by denitrification.