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1

Denitrification rate in soils as affect by their redox conditions

100%
Stepniewska Z., Bennicelli R. P., Weiss U., Wlodarczyk T., Stahr K.
Journal of Water and Land Development
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2000
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nr 04
The aim of the study was to investigate the influence of soil redox resistance on denitrification rate in soil material of 9 profiles from Poland and Germany. The soil samples from particular horizons were incubated under water saturation, in closed bottles, in an atmosphere of gaseous nitrogen containing 3 % acetylene at a temperature of 20°C for 5 days. The values of redox potential, pH, and the evolution of carbon dioxide and nitrous oxide were measured after 12, 24, 48, and 120 hours. The rate of nitrous oxide evolution in relation to native carbon mineralization, redox potential and soil reaction is discussed. Denitrification rate showed maximum at pH 6.3-7.3 and Eh 150-300 mV. It was positively correlated with redox resistance (t400).
2

A contribution to the assessment of potential denitrification in arable mineral soils of Poland

100%
Glinski J., Stepniewska Z., Stepniewski W., Ostrowski J., Szmagara A.
Journal of Water and Land Development
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2000
|
nr 04
The main mechanism responsible for N20 production in agroecosystems is denitrification of nitrates (V) under hypoxic conditions, which occur e.g., after intensive precipitation or at high ground water level. The calculations of potential denitrification were performed for surface horizons from 672 soil profiles representing 25 main soil units of Polish soils. A proposal of the assessment of potential denitrification rate on the basis of the nitrate content, humus horizon thickness, its bulk density and of previously investigated soil redox resistance in the form of indicators tm and tm is presented. The proposal is based on the assumption that denitrification is linear with time and is illustrated for the temperature of 20°C. It was shown, that the highest potential denitrification would occur in Rendzic Leptosols and in the soils developed from loess i.e. Phaeozem, Cambisol and Luvisol, while the lowest <5 kg ha-1d-1 N - in Luvisols developed from loose sands, loams and skeleton loams. Evaluation of spatial distribution of the potential denitrification rate at current nitrate content in mineral soils of Poland has been attempted in the form of a map.
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