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Spatial Variability of Field-Measured Denitrification Gas Fluxes¹

ABSTRACT

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.

¹ Contribution from the Dep. of Land, Air and Water Resources, Univ. of California, Davis, CA 95616.

² Research Assistant and Professor of Soil Science, respectively, Dep. of Land, Air and Water Resources, Univ. of California, Davis, CA 95616. Present address of senior author is Dep. of Soil Science, Faculty of Agriculture, Univ. of Maiduguri, Maiduguri, Borno-State, Nigeria.

Received for publication October 7, 1983. Accepted for publication May 21, 1984.

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