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Soil Science Society of America Journal Abstract -

Spatial Variability of Field-Measured Denitrification Gas Fluxes1


This article in SSSAJ

  1. Vol. 48 No. 6, p. 1214-1219
    Received: Oct 7, 1983
    Accepted: May 21, 1984

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  1. O. A. Folorunso and
  2. D. E. Rolston2



The structure and magnitude of the spatial variability of N2O and N2O + N2 fluxes were investigated along 12 transects of a Yolo loam (Typic Xerorthents) field site. The field-measured N2O and N2O + N2 fluxes were In-normally distributed and exhibited large spatial variability. Calculated coefficients of variation ranged from 161 to 508% for the N2O + N2 fluxes and 282 to 379% for the N2O fluxes. Analysis of autocorrelograms and partial autocorrelograms showed that in only 1 transect out of the 12 did the N2O and N2O + N2 fluxes reveal any spatial dependence indicative of an autore-gressive process. Thus, the denitrification flux values for this field site are considered to be spatially independent. With a knowledge of the frequency distribution and variances of the measured gas fluxes, it was calculated to require from 156 to 4117 N2O + N2 flux measurements and 350 N2O flux measurements to estimate the “true” mean flux within ±10% of the estimated mean on a 3 by 36 m experimental plot.

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