Mechanisms for soil moisture effects on activity of nitrifying bacteria
Article Abstract:
Analysis of the influence of cytoplasmic dehydration and diffusional limitations on the rate of nitrification in soil by two independent techniques reveals that both diffusional limitation of substrate supply and adverse physiologic effects due to cell dehydration are responsible for the decrease in the activity of nitrifying bacteria at low soil moisture. For soil water potentials higher than -0.6 MPa, substrate limitation is the dominant inhibiting factor, while for soil water potentials less than -0.6 MPa, adverse physiological effect is the major inhibiting factor.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1995
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Nitrogen transformations in wetland soil cores measured by 15N isotope pairing and dilution at four infiltration rates
Article Abstract:
The water infiltration rate (IR) through wetland soil cores affects the proportion of 30N2, 29N2, 15NO3- and 15NH4+ dissolved in the outflow water, but the total nitrogen level is unaffected. The removal of nitrate is more at a low IR and less at a high IR. The nitrate removal is balanced by the release of ammonium and dissolved organic nitrogen. A high IR increases the bioavailability of the dissolved organic matter. The nitrogen cycling is measured by infiltrating aqueous 15NO3- through soil cores and detecting the nitrogen forms in the outflow water.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1996
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