Thermal conductivity of a Brown Earth soil as affected by biochars derived at different temperatures: Experiment and prediction with the Campbell model
Thermal conductivity of a Brown Earth soil as affected by biochars derived at different temperatures: Experiment and prediction with the Campbell model
Thermal conductivity is a significant heat transfer
property of soil. However, the influence of biochar on this property
is not well known. In this research, the influence of corn straw
biochars prepared at 300, 500 and 700oC on the thermal conductivity
of a Brown Earth (Hapli-Udic Cambisol, FAO) soil and its
prediction using a Campbell model was examined. The outcomes
revealed that the bulk densities of the soil markedly decreased with
increases in the biochar amendment rates of 1, 3, and 5% in linear
patterns. The reduction in bulk density was mainly attributed to an
increase in soil porosity and organic carbon content. With increasing
volumetric water contents (10, 20, 30 and 40%), the thermal
conductivity of the soils significantly increased, whereas those of
soils with biochar amendment were obviously less than that of
the CK and the differences increased with the biochar application
rates. The pyrolysis temperature of biochar exhibited a negligible
effect on the bulk density and thermal conductivity of soils at
large. Combining the linear reduction of bulk density with the biochar
amendment rate into the Campbell model, well-fitting results
for the variation inthermal conductivity versus volumetric water
content were obtained and accurate values could be predicted.
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