Denitrification in intact subsoil cores

  • Castle K
  • Arah J
  • Vinten A
  • 20


    Mendeley users who have this article in their library.
  • 13


    Citations of this article.


Intact, unamended subsoil cores taken from two contrasting field sites were incubated in the laboratory at 12 7C under aerobic (21% O2) and anaerobic (1.15.5% O2) conditions. Denitrification of 15N-NO3 P diffusing into the cores across a semi-permeable membrane was estimated by: (1) direct observation of 15Nlabelled N2 and N2O, and (2) mass balance following sectioning at the end of the experiment. The in situ denitrification potential (rates where the supply of NO3 P is not limited by diffusion) was estimated using a finitedifference approximation to a diffusion reaction equation based on comparison of time and depth profiles of NO3 P and BrP in the incubated cores. Potentials between 0.2 and 2.5 mg N kgP1 dayP1 were obtained under low O2 and natural C concentrations. These results indicate the potential for denitrification in glacial till subsoils to reduce NO3 P leaching to ground or surface waters to levels unlikely to result in a pollution hazard. The major product of NO3 P reduction in these subsoils was observed to be N2, rather than the greenhouse gas and catalyst of stratospheric O3 removal, N2O.

Author-supplied keywords

  • Denitrification
  • Natural carbon concentrations
  • Nitrogen-15
  • Nitrous oxide
  • Subsoil

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free