Study of the soil thermal regime in an area of ​​natural vegetation in the Pampa biome




Soil heat flux, Thermal conductivity, Soil Temperature


This study analyzes the thermal variability of soil in a natural pasture area in the Pampa biome in southern Brazil.  The dataset was collected at the experimental site located in Santa Maria - RS (SMA). The hybrid model is based on an analytical solution of the heat conduction equation and in experimental data. Soil thermal properties, thermal conductivity (), and thermal diffusivity () were estimated for different combinations of the clearness index and soil moisture. The  values obtained in this study are the lowest in dry conditions and the highest ones in wet conditions. From the average daily cycles, the hysteresis phenomenon is more pronounced between soil heat flux () and global solar radiation for all clearness index ranges. The present analysis identified better relations between  and temperature soil temperature at 0,05 m and air temperature. Hysteresis exhibit the same behavior when data are classified by soil moisture. The results obtained here can be used in models that intend to represent the behavior of energy exchange between the soil-surface atmosphere.


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Author Biographies

Lidiane Buligon, Universidade Federal de Santa Maria, Santa Maria, RS

Doutora em Física, Universidade Federal de Santa Maria

Tamíres Zimmer, Universidade Federal de Santa Maria, Santa Maria, RS

Mestre em Física, Universidade Federal de Santa Maria

Vanessa de Arruda Souza, Universidade Federal de Santa Maria, Santa Maria, RS

Doutora em Sensoriamento Remoto, Universidade Federal do Rio Grande do Sul

Débora Regina Roberti, Universidade Federal de Santa Maria, Santa Maria, RS

Doutorado em Física, Universidade Federal de Santa Maria


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How to Cite

Buligon, L., Zimmer, T., Souza, V. de A., & Roberti, D. R. (2020). Study of the soil thermal regime in an area of ​​natural vegetation in the Pampa biome. Ciência E Natura, 42, e9.

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