Department of Soil Science and Agrochemistry, Northwestern University of Agriculture, Yangling, Shaanxi, China.
Nitrous oxide production and denitrification in Scottish arable soils
Article first published online: 28 JUL 2006
Journal of Soil Science
Volume 42, Issue 3, pages 351–367, September 1991
How to Cite
ARAH, J. R. M., SMITH, K. A., CRICHTON, I. J. and LI, H. S. (1991), Nitrous oxide production and denitrification in Scottish arable soils. Journal of Soil Science, 42: 351–367. doi: 10.1111/j.1365-2389.1991.tb00414.x
- Issue published online: 28 JUL 2006
- Article first published online: 28 JUL 2006
- (Received 25 January 1991; accepted 4 April 1991)
Nitrous oxide (N2O) emissions and concentrations in the soil atmosphere were measured at a number of sites of differing soil type in south-east Scotland between 1985 and 1988. Concentrations followed log-normal distributions and were significantly affected by soil type, tillage treatment, and nitrate application rate. The shape of the profiles suggested significant consumption in the upper 5 cm, making calculations of emission rates using Fick's Law unsatisfactory. Emission rates measured using closed flux chambers were at least one order of magnitude smaller from heavier-textured arable soils than from lighter ones.
Denitrification fluxes measured by field application of the acetylene inhibition technique were lowest in a clay loam, and highest in an alluvial sandy loam; this was attributed to a failure to achieve a satisfactory distribution of acetylene in the heavier soil. Denitrification rates in soil cores generally exceeded measured surface fluxes; incubation at decreased oxygen concentrations typical of those measured in the field produced a further significant increase. Core incubation should be used as an alternative to in situ field measurement only if the oxygen concentration in the incubation vessels is adjusted to mimic that in the field; otherwise denitrification rates may be significantly underestimated.