, Volume 14, Issue 3, pp 369-380

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

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Abstract

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.

Contribution from the Agricultural Research Service, US Department of Agriculture in cooperation with N.Y. State College of Agriculture, Cornell University, Ithaca, No. 1205. CBRI Contribution No. 966.