ekS - Instytut Agrofizyki im. Bohdana Dobrzańskiego PAN w Lublinie ...

14. INDEX OF FIGURES
Fig. 1. Hardware setup for simultaneous measurement of soil water
content and electrical conductivity using Time Domain
Reflectometry method .........................................................................16
Fig. 2. Relation between the soil refractive index, n, and its water
content, θ, for mineral and organic soil samples as well as their
mixtures. A - experimental data, B - regression n(θ). .........................18
Fig. 3. Relations between the refractive index, n = ε , and volumetric
water content, θ, and related regression lines......................................20
Fig. 4. Relative refractive index, n = ε , as the function of water content
for selected wood types .......................................................................21
Fig. 5. Bulk electrical conductivity, EC a-TDR , of the investigated soil
samples obtained using TDR pulse attenuation method
accordingly to Eq. (3), versus reference data, EC a-4p , determined
using four-electrode reference method................................................23
Fig. 6. Comparison of the bulk electrical conductivity of the investigated
soils, EC a-TDR , with the reference data, EC a-4p , after correction
accordingly do the polynomial of Fig. 5 .............................................24
Fig. 7. Frequency dispersion of the real part, ε’, and module, k, of the
complex dielectric constant of the electrolyte for different
conductivities.......................................................................................27
Fig. 8. Frequency dispersion of the real part, ε’, of the complex dielectric
constant and the loss angle, δ, for the electrolyte for its various
electrical conductivities, EC w ..............................................................29
Fig. 9. The relation n(θ ) for soil samples moistened by KCl solutions of
different electrical conductivities, EC w ...............................................32
Fig. 10. TDR interpretation of soil as a tree phases medium in dielectric
mixing model α ...................................................................................33
Fig. 11. Determination of the dielectric constant of soil solid phase using
extrapolation and three-phase soil dielectric mixing model α. ...........37
Fig. 12. Relation between the soil relative dielectric constant, ε, and soil
volumetric water content, θ, for the investigated mineral soils.
The solid line represents the empirical model (31) calculated for
the average bulk density of the soil samples 1.42 [gcm -3 ]...................38
Fig. 13. Comparison of soil relative dielectric constants of the investigated
soil samples measured by TDR method (horizontal axis) and
144