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

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Glinski J., Stepniewska Z., Stepniewski W., Ostrowski J., Szmagara A.

Journal of Water and Land Development

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.

Ograniczanie wyników

1 Journal of Water and Land Development

1 Glinski J.

1 Ostrowski J.

1 Stepniewska Z.

1 Stepniewski W.

1 Szmagara A.

1 2000

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