HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (8) Citing Articles via Google Scholar Google Scholar Articles by Bachmann, J. Articles by van der Ploeg, R. R. Search for Related Content PubMed Articles by Bachmann, J. Articles by van der Ploeg, R. R. Agricola Articles by Bachmann, J. Articles by van der Ploeg, R. R.

DIVISION S-1 - NOTES

Comparison of the thermal properties of four wettable and four water-repellent soils

^a Str. 2, 30419 Hannover, Germany
^b Dept. of Agronomy, Iowa State Univ., Ames, IA 50011
^c Soil and Fertilizer Institute, Hebei Academy of Agricultural Sciences, Hebei, China

* Corresponding author (rhorton{at}iastate.edu)

Water repellency is a widespread phenomenon, but its effect on most physical soil properties is still unknown. The present study deals with the thermal conductivity and volumetric heat capacity of wettable and water-repellent (hydrophobic) sandy and silty soils. Thermal conductivity and volumetric heat capacity were determined by heat pulse measurements. Heat pulse measurements were made on samples of eight soils (four pairs of wettable soil and the corresponding water-repellent counterpart). Water repellency either was caused by soil organic matter showing natural repellency or induced by chemical treatment of wettable soils with dichlorodimethylsilane (C₂H₆SiCl₂). Thermal conductivity was also predicted with the models of de Vries and of Campbell. Almost all measured conductivities were larger than those predicted by the de Vries model. For the wettable soils, most of the conductivities in the soil water saturation range between 0.20 and 0.75 differed by more than 0.5 W m^-1 K^-1. The hydrophobic soils however, showed only in the range around a saturation degree of 0.20 to 0.50 values that deviated more than 0.5 W m^-1 K^-1 from the predictions. The Campbell model underestimated the conductivity at low saturation for wettable and hydrophobic soil, but overestimated it at high saturation for the wettable soil. Thermal conductivity for either dry or water-saturated soil was predicted satisfactorily by both models. It was found further that soil wettability had no systematic impact on heat capacity. It is concluded that soil thermal conductivity decreased as soil hydrophobicity increased, whereas the volumetric heat capacity was not affected by soil wettability.

This article has been cited by other articles:

				S. Lu, T. Ren, Y. Gong, and R. Horton An Improved Model for Predicting Soil Thermal Conductivity from Water Content at Room Temperature Soil Sci. Soc. Am. J., January 1, 2007; 71(1): 8 - 14. [Abstract] [Full Text] [PDF]