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Calibration and Field Test of Soil Heat Flux Plates¹

ABSTRACT

Soil heat flux plates were calibrated in the laboratory in steady-state conditions and checked in the field vs. the soil temperature gradient thermal conductivity measurements of heat flux density. Good agreement was obtained after correcting for the flux divergence in the layer of soil where the temperature gradient was measured. Soil heat flux density measurements in a bare soil indicated that the heat storage in a 5-cm layer of soil above the flux plates contributes significantly to the diurnal soil heat flux wave.

¹ Contribution of the Department of Soil and Water Sciences, University of Wisconsin, Madison. Published with the permission of the Director of the University of Wisconsin Agr. Exp. Sta. This work was supported in part by the National Science Foundation, Atmospheric Sciences Section, NSF Grant GP2404 and USDA Hatch Funds.

² Research Assistant and Professor, respectively.

Received for publication October 24, 1967. Accepted for publication December 26, 1967.