Dehydrogenase activity of some hungarian soils as related to their water and aeration status
 
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1
Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, P.O. Box 201, 20-290 Lublin 27, Poland
2
Research Institute for Soil Science and Agricultural Chemistry, Hungarian Academy of Sciences, Herman Otto u. 15, H-1020 Budapest, Hungary
Acceptance date: 2000-01-10
 
Int. Agrophys. 2000, 14(3): 341–354
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ABSTRACT
Four horizons (till the depth of 130 cm) of six typical Hungarian soil profiles (Fluvic Gleysol, Vertic Gleysol and Orthic Solonetz) were investigated in order to determine relation between dehydrogenase activity, oxygen diffusion rate (ODR), redox potential (Eh) as well as Fe+2 content and the soil water status, and to relate them to the soil utilisation and cultivation type. The experiments were performed with the use of undisturbed soil samples preincubated on the water tension plates at 0, 63, 159 and 500 hPa at room temperature. All the investigated parameters varied widely in the tested soils. Dehydrogenase activity and reduced iron content decreased but ODR and Eh values increased with increasing soil water tension. A close relationship between oxygenation indicators (ODR, Eh and Fe+2) and dehydrogenase activity was found. The most sensitive oxygenation parameter for describing the relationship between enzyme activity and soil aeration status appeared to be ODR. The studied soils showed a significant decrease of Eh as well as tendency to diminish their ODR, dehydrogenase activity and reduced iron content due to deep-loosening cultivation.
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