Study of the soil thermal regime in an area of natural vegetation in the Pampa biome
DOI:
https://doi.org/10.5902/2179460X45319Keywords:
Soil heat flux, Thermal conductivity, Soil TemperatureAbstract
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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