Abstract
Developing soil macro-porosity could be considered to be a direct effect of physical, chemical and eco-pedological processes where the soil matrix has contact with coarse elements. Hence, macro-porosity acquires a special importance affecting the liquid phase as well as the gas phase, and therefore the soil thermal properties as well. The aim of this research is to evaluate the effect of the coarse elements on the total thermal resistivity (Rho) for a sandy soil. The experiment was carried out with several gravel masses (kggravels·kgsoil-1) mixed with soil, and repacked in a soil column device. The method used for measuring the thermal resistivity was the heat pulse, based on ASTM D5334-08. The water content (θ) was determined using capacitor probes (FDR probes). The experimental device was maintained inside a thermal chamber for controlling a minimal thermal drift. The Rho(θ) relationship presented higher variability when 35% of coarse elements were added and the water content was close to saturation.
Highlights
Developing soil macro-porosity could be considered to be a direct effect of physical, chemical and eco-pedological processes where the soil matrix has contact with coarse elements
A relação Rho(θ) neste tipo de solos apresentou uma elevada variabilidade nos valores de resistividade térmica quando a percentagem de elementos grosseiros era de aproximadamente de 35% e o teor de água perto das condições de saturação
García-Rodríguez (1985) presentó estudios cualitativos en relación a la masa, tamaño y profundidad donde se encuentran estos fragmentos del material parenteral no meteorizados y formando parte de la matriz suelo
Summary
Siguiendo a FAO (2006) y debido a las condiciones edafogénicas del propio suelo, los elementos gruesos se pueden encontrar desde muy pocos (sobre un 2%) a fracción dominante (> 80%) dentro del perfil edáfico. Flint y Childs (1984) y Espeby (1989) comentan en sus trabajos los efectos que producen los elementos gruesos sobre la estructura y la porosidad del suelo, así como un aumento de la heterogeneidad y anisotropía del medio (Ingelmo et al 1994). Finalmente, una tercera variable que afectará a la resistividad térmica será la densidad aparente del suelo. El objetivo de este trabajo es evaluar la influencia que pueden presentar los elementos gruesos sobre la resistividad térmica (Rho) de un suelo arenoso, pero debido a que existen numerosas variables que afectan a esta propiedad, y que en si mismas tienen su propia Rho, se dividió el ensayo en dos objetivos operativos, (i) caracterizar la resistividad térmica global del suelo a estudiar en función de la variable contenido hídrico, y (ii) determinar la influencia de elementos gruesos de un mismo tamaño sobre la resistividad térmica global del suelo
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