Soil temperature dynamics and heat transfer in a soil cropped to rice

Renaud, F. , Scott, H.D. and Brewer, D.W. (2001) Soil temperature dynamics and heat transfer in a soil cropped to rice. Soil Science, 166(12), pp. 910-920.

Abstract

Soil temperature distribution and heat transfer affect crop development as well as water and solute transfers in the vadose zone. The objective of this study was to characterize seasonal soil temperature distribution throughout a rice-growing season in an eastern Arkansas soil typically cropped to rice. Soil temperature (T) measurements and climatic parameters were taken every 30 min throughout the season. T was measured in a layered calloway silt loam (fine-silty, mixed, thermic, Aquic Fragiudalfs) at nine different depths from the soil surface to 1 m. Results indicated that average daily soil T varied throughout the season at all recording depths (e.g., from 14.2 °C to 29.3 °C at 0.14 m and from 13 °C to 24.9 °C at 1 m). Diurnal soil T amplitude was reduced, and T phase shift increased by an additional 3 h at 0.05 m and by 5 h at 0.14 m and 0.26 m (when compared with air temperatures) on field flooding and increased canopy cover. Heat transfer was modeled using the onedimensional Fourier equation, solved using the finite element method of the mathematical software MATLAB. Predicted T (Tp) were in close agreement with measured T (Tm) at all depths in the soil profile when two constant values of thermal diffusivity ([alpha]) were used for the soil profile: [alpha] = 4.58E-7 m2 s-1 in the Ap1 horizon and [alpha] = 4.86E-7 m2 s-1 in the rest of the soil profile. Differences between Tp and Tm were always lower than 1.04 °;C for all periods considered.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Renaud, Professor Fabrice
• Authors: Renaud, F., Scott, H.D., and Brewer, D.W.
• College/School: College of Social Sciences > School of Social & Environmental Sustainability
• Journal Name: Soil Science
• Publisher: Lippincott, Williams & Wilkins
• ISSN: 0038-075X
• ISSN (Online): 1538-9243

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