Nitrogen Transformations in Wetland Soil Cores Measured by (sup15)N Isotope Pairing and Dilution at Four Infiltration Rates.

Applied and Environmental Microbiology
R StepanauskasL Leonardson

Abstract

The effect of water infiltration rate (IR) on nitrogen cycling in a saturated wetland soil was investigated by applying a (sup15)N isotope dilution and pairing method. Water containing [(sup15)N]nitrate was infiltrated through 10-cm-long cores of sieved and homogenized soil at rates of 72, 168, 267, and 638 mm day(sup-1). Then the frequencies of (sup30)N(inf2), (sup29)N(inf2), (sup15)NO(inf3)(sup-), and (sup15)NH(inf4)(sup+) in the outflow water were measured. This method allowed simultaneous determination of nitrification, coupled and uncoupled denitrification, and nitrate assimilation rates. From 3% (at the highest IR) to 95% (at the lowest IR) of nitrate was removed from the water, mainly by denitrification. The nitrate removal was compensated for by the net release of ammonium and dissolved organic nitrogen. Lower oxygen concentrations in the soil at lower IRs led to a sharper decrease in the nitrification rate than in the ammonification rate, and, consequently, more ammonium leaked from the soil. The decreasing organic-carbon-to-nitrogen ratio (from 12.8 to 5.1) and the increasing light A(inf250)/A(inf365) ratio (from 4.5 to 5.2) indicated an increasing bioavailability of the outflowing dissolved organic matter with increa...Continue Reading

References

Jan 1, 1982·Antonie van Leeuwenhoek·J M TiedjeJ A Robinson
Mar 1, 1982·Microbiological Reviews·R Knowles
Oct 1, 1979·Applied and Environmental Microbiology·M K Firestone, J M Tiedje
Feb 1, 1983·Applied and Environmental Microbiology·T NishioA Hattori
Dec 1, 1986·Applied and Environmental Microbiology·E A DavidsonT O Perry
Nov 1, 1994·Applied and Environmental Microbiology·N O JørgensenR B Coffin

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Citations

Apr 9, 2011·Applied Microbiology and Biotechnology·Meng Li, Ji-Dong Gu
Mar 15, 2006·Applied and Environmental Microbiology·T E DavidssonL Leonardson

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