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A New Perspective on Soil Thermal Properties

^a Dep. of Agronomy, Iowa State Univ., Ames, IA 50011, USA
^b Hebei Academy of Agricultural Sciences, 598 W. Heping Road, Shijiazhuang, Hebei 050051, PRC

View larger version (19K): [in a new window]   Fig. 1. Volume fractions of water (), solids (vs), and air (na) for 59 packed columns of four medium-textured soils.

View larger version (30K): [in a new window]   Fig. 2. Thermal conductivity (), heat capacity (C), and thermal diffusivity () versus volume fractions of water (), solids (vs), and air (na) for four medium-textured soils.

View larger version (18K): [in a new window]   Fig. 3. Modeled thermal conductivity using de Vries model versus measured thermal conductivity for 59 samples of four soils. Solid line is the 1:1 line.

View larger version (18K): [in a new window]   Fig. 4. Thermal conductivity as a function of (a) water content and (b) air-filled porosity. Circles are measured data. Solid lines represent maximum expected thermal conductivity values based on de Vries model. Dashed lines represent minimum expected thermal conductivity values based on de Vries model.

View larger version (17K): [in a new window]   Fig. 5. Modeled heat capacity versus measured heat capacity using additive model for heat capacity. Solid line is the 1:1 line.