Influence of pH on the release of NO and N2O from fertilized and unfertilized soil |
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| Authors: | W Nägele R Conrad |
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| Institution: | (1) Fakultät für Biologie, Universität Konstanz, Universitätsstr. 10, POB 5560, D-7750 Konstanz, Federal Republic of Germany |
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| Abstract: | Summary NO and N2O release rates were measured in an acidic forest soil (pH 4.0) and a slightly alkaline agricultural soil (pH 7.8) after the pH was adjusted to values ranging from pH 4.0 to 7.8. The total release of NO and N2O during 20 h of incubation was determined together with the net changes in the concentrations of NH
4
+
, NO
2
–
and NO
3
–
in the soil. The release of NO and N2O increased after fertilization with NH
4
+
and/or NO
3
–
; it strongly decreased with increasing pH in the acidic forest soil; and it increased when the pH of the alkaline agricultural soil was decreased to pH 6.5. However, there was no simple correlation between NO and N2O release or between these compounds and activities such as the NO
2
–
accumulation, NO
3
–
reduction, or NH
4
+
oxidation. We suggest that soil pH exerts complex controls, e.g., on microbial populations or enzyme activities involved in nitrification and denitrification. |
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| Keywords: | Denitrification Nitrification Chemodenitrification Ammonium Nitrite Nitrate Nitric oxide Nitrous oxide |
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