Boundary-Layer Meteorology

, Volume 14, Issue 3, pp 369-380

First online:

Variations of carbon dioxide, air temperature, and horizontal wind within and above a maize crop

  • R. L. DesjardinsAffiliated withAgrometeorology Research and Service, Chemistry and Biology Research Institute, Agriculture Canada
  • , L. H. AllenJr.Affiliated withU.S. Department of Agriculture
  • , E. R. LemonAffiliated withU.S. Department of Agriculture, Cornell University

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The mean and short-term fluctuations of carbon dioxide concentration, air temperature, and horizontal wind speed were measured simultaneously within and above a maize crop. Although fluctuations were large at each of the 10 measurement heights, the largest were at the 180-cm level, the densest part of the crop. These short-term fluctuations indicated the broad range of environmental conditions to which plants are exposed (and which plants create or modify) in the field. The statistics of the distributions of these meteorological elements are discussed and the deviations from steady-state conditions are examined by determining linear trends. Finally, variance spectra showed the periodicity of the variations of these meteorological elements.