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


ALLEN, R. G. et al. Allen_FAO1998. Irrigation and Drainage Paper No. 56, FAO, p. 300, 1998.

AN, K. et al. Estimation from Soil Temperature of Soil Thermal Diffusivity and Heat Flux in Sub-surface Layers. Boundary-Layer Meteorology, v. 158, n. 3, p. 473–488, 2016.

CARSLAW, HORATIO SCOTT AND JAEGER, J. C. Conduction of heat in solids. 2d ed. ed. [s.l.] Oxford: Clarendon Press, 1959.

HEUSINKVELD, B. G. et al. Surface energy balance closure in an arid region: Role of soil heat flux. Agricultural and Forest Meteorology, v. 122, n. 1–2, p. 21–37, 2004.

HORTON, R.; WIERENGA, P. J.; NIELSEN, D. R. Evaluation of Methods for Determining the Apparent Thermal Diffusivity of Soil Near the Surface1. Soil Science Society of America Journal, v. 47, n. 1, p. 25, 1983.

KUYE, A.; JAGTAP, S. S. Analysis of solar radiation data for Port Harcourt, Nigeria. Solar Energy, v. 49, n. 2, p. 139–145, 1992.

MARTHEWS, T. R.; MALHI, Y.; IWATA, H. Calculating downward longwave radiation under clear and cloudy conditions over a tropical lowland forest site: An evaluation of model schemes for hourly data. Theoretical and Applied Climatology, v. 107, n. 3–4, p. 461–477, 2012.

NIU, S.; LUO, Y.; FEI, S.; MONTAGNANI, L.; BOHRER, G.; JANSSENS, I. A.; GIELEN, B.; RAMBAL, S.; MOORS, E.; MATTEUCCI, G. Seasonal hysteresis of net ecosystem exchange in response to temperature change: patterns and causes. Global Change Biology, Wiley Online Library, v. 17, n. 10, p. 3102–3114, 2011.

OTUNLA, T. A.; OLADIRAN, E. O. Evaluation of soil thermal diffusivity algorithms at two equatorial sites in West Africa. Annals of Geophysics, v. 56, n. 1, 2013.

PEEL, MURRAY C; FINLAYSON, BRIAN L; MCMAHON, T. A. Updated world map of the Köppen-Geiger climate classification. Hydrology and Earth System Sciences, v. 4, p. 439–473, 2007.

PREVEDELLO, C. L. Física do solo com problemas resolvidos-2Ed. [S.l.: s.n.], 2015.

RUBERT, G. C. et al. Evapotranspiration of the Brazilian Pampa biome: Seasonality and influential factors. Water (Switzerland), v. 10, n. 12, p. 1–18, 2018.

WANG, L.; GAO, Z.; HORTON, R. Comparison of six algorithms to determine the soil apparent thermal diffusivity at a site in the loess plateau of China. Soil Science, v. 175, n. 2, p. 51–60, 2010.

ZHENG, H. et al. Hysteresis responses of evapotranspiration to meteorological factors at a diel timescale: Patterns and causes. PLoS ONE, v. 9, n. 6, p. 1–10, 2014.

ZUECCO, G. et al. A versatile index to characterize hysteresis between hydrological variables at the runoff event timescale. Hydrological Processes, v. 30, n. 9, p. 1449–1466, 2016.



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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