Influence of oxygen on denitrification and aerobic respiration in soil |
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Authors: | L Kroeckel H Stolp |
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Institution: | (1) Lehrstuhl für Mikrobiologie, Universität Bayreuth, Postfach 3008, D-8580 Bayreuth, Federal Republic of Germany |
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Abstract: | Summary The influence of the partial pressure of oxygen on denitrification and aerobic respiration was investigated at defined P02 values in a mull rendzina soil. The highest denitrification and respiration rates obtained in remoistened, glucose- and nitrate-amended soil were 43 1 N20 h–1g–1 soil and 130 1 O2 h–1g–1 soil, respectively. At -55 kPa matric water potential, corresponding to 40% water saturation, N20 was produced only below P02 40 hPa. The K
m, for O2 was 3.0 x 10–6 M. Formation of N2O and consumption of O2 occurred simultaneously with half maximum rates at P02 6.7–13.3 hPa. Nitrite accumulated in soil below 40 hPa and increased with decreasing pO2. The upper threshold for N20 formation in amended soil was P02 33–40 hPa (39-47 M O2). |
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Keywords: | Denitrification Aerobic respiration P02 Rendzina soil Water potential |
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