HEAT FLUX IN SANDY SOIL AND ITS RELATIONS WITH SOIL AND AIR TEMPERATURE

Document Type : Research articles.

Authors

Soil, Water and Environment Agriculture Research Center, Giza

Abstract

A heat flux plate was installed at 0.05m depth and thermo
wires were installed at 0.05 and 0.3m depths in sandy soil with
grasses of the surface at Ismailia Agriculture Research Station.
Data of soil heat flux (G) (W/m2) and soil temperatures were
recorded every fifteen mints to represent 96 readings/day and air
temperatures (oC) were recorded every one hour. Finally, twenty
four values for soil heat flux, soil temperatures were calculated
and air temperature were recorded along a year. The objectives
must study the soil heat flux at 0.05m depth and its relation to soil
and air temperature. Also to calculate heat flux at 0.3m depth and
determined the relation between G at 0.05m and G at 0.3m.
The obtained results showed that soil heat flux values
(W/m2) at 0.05 m depth were higher at the day time with their
peaks were at the mid day. The values became negative at night
and early morning in the months of December, January, February
and March, while the values became positive and low at early
morning in the other months.
Soil heat flux had been affected by both soil and air
temperatures. The temperatures of air were more effective than
soil temperatures of all months except for May and June. While, in
March both temperatures had more or less similar effect on soil
heat flux.
The correlation coefficients and regression equations were
significant between soil heat flux and either soil or air
temperatures during the tested period.
The values of calculated soil heat flux (G) at 0.30 m depth
were less than those of measured soil heat flux (G) at 0.05 m,inspite of the significant values of correlation and regression between each other.

 

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Fayoum Journal of Agricultural Research and Development
Volume 31, Issue 1
January 2017
Pages 15-30

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