Details
| Original language | English |
|---|---|
| Pages (from-to) | 342-349 |
| Number of pages | 8 |
| Journal | Soil Science Society of America Journal |
| Volume | 76 |
| Issue number | 2 |
| Publication status | Published - 2012 |
Abstract
Soil wettability is strongly affected by the soil water content. In turn, wettability infl uences water distribution in soil pores and thereby soil water retention characteristics. In this study, soil water desorption curves (SWDC) for naturally occurring hydrophilic sand, loam, and silt loam samples and for corresponding artifi cially hydrophobized sand, loam, and silt loam samples were measured in the pF range from 0 to 4.2. Moisture-dependent wettability was described with the contact angle (CA) method and the water drop penetration time (WDPT) test. One objective was to directly measure the phenomenological CA of the soils at different water contents and to compare the results with that from the WDPT test. A second objective was to show differences of soil water desorption curves for the hydrophilic materials as compared to the silanized hydrophobic materials. All experiments were done on soil samples with time-stable water repellency to study directly the impact of water content without further time dependent factors. Soil wettability as a function of water content was generally comparable, indicating that CA and WDPT could be used to indicate the moisture-dependent wettability. The SWDCs were separated into three domains. Domain I was characterized by the Wenzel wetting regime, and Domains II and III were described by the Cassie-Baxter wetting regime. Water repellency showed insignifi cant impacts on the SWDCs in Domains I and III, but it reduced soil water retention capacity in Domain II, which was supported by the monotonical increase of CA from zero to a maximum as soil water content decreased to a critical point near the permanent wilting point. Water repellency had clear and important infl uences on soil water desorption curves.
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
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In: Soil Science Society of America Journal, Vol. 76, No. 2, 2012, p. 342-349.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Moisture-dependent wettability of artifi cial hydrophobic soils and its relevance for soil water desorption curves
AU - Liu, Hui
AU - Ju, Zhaoqiang
AU - Bachmann, Jörg
AU - Horton, Robert
AU - Ren, Tusheng
N1 - Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2012
Y1 - 2012
N2 - Soil wettability is strongly affected by the soil water content. In turn, wettability infl uences water distribution in soil pores and thereby soil water retention characteristics. In this study, soil water desorption curves (SWDC) for naturally occurring hydrophilic sand, loam, and silt loam samples and for corresponding artifi cially hydrophobized sand, loam, and silt loam samples were measured in the pF range from 0 to 4.2. Moisture-dependent wettability was described with the contact angle (CA) method and the water drop penetration time (WDPT) test. One objective was to directly measure the phenomenological CA of the soils at different water contents and to compare the results with that from the WDPT test. A second objective was to show differences of soil water desorption curves for the hydrophilic materials as compared to the silanized hydrophobic materials. All experiments were done on soil samples with time-stable water repellency to study directly the impact of water content without further time dependent factors. Soil wettability as a function of water content was generally comparable, indicating that CA and WDPT could be used to indicate the moisture-dependent wettability. The SWDCs were separated into three domains. Domain I was characterized by the Wenzel wetting regime, and Domains II and III were described by the Cassie-Baxter wetting regime. Water repellency showed insignifi cant impacts on the SWDCs in Domains I and III, but it reduced soil water retention capacity in Domain II, which was supported by the monotonical increase of CA from zero to a maximum as soil water content decreased to a critical point near the permanent wilting point. Water repellency had clear and important infl uences on soil water desorption curves.
AB - Soil wettability is strongly affected by the soil water content. In turn, wettability infl uences water distribution in soil pores and thereby soil water retention characteristics. In this study, soil water desorption curves (SWDC) for naturally occurring hydrophilic sand, loam, and silt loam samples and for corresponding artifi cially hydrophobized sand, loam, and silt loam samples were measured in the pF range from 0 to 4.2. Moisture-dependent wettability was described with the contact angle (CA) method and the water drop penetration time (WDPT) test. One objective was to directly measure the phenomenological CA of the soils at different water contents and to compare the results with that from the WDPT test. A second objective was to show differences of soil water desorption curves for the hydrophilic materials as compared to the silanized hydrophobic materials. All experiments were done on soil samples with time-stable water repellency to study directly the impact of water content without further time dependent factors. Soil wettability as a function of water content was generally comparable, indicating that CA and WDPT could be used to indicate the moisture-dependent wettability. The SWDCs were separated into three domains. Domain I was characterized by the Wenzel wetting regime, and Domains II and III were described by the Cassie-Baxter wetting regime. Water repellency showed insignifi cant impacts on the SWDCs in Domains I and III, but it reduced soil water retention capacity in Domain II, which was supported by the monotonical increase of CA from zero to a maximum as soil water content decreased to a critical point near the permanent wilting point. Water repellency had clear and important infl uences on soil water desorption curves.
UR - http://www.scopus.com/inward/record.url?scp=84863266613&partnerID=8YFLogxK
U2 - 10.2136/sssaj2011.0081
DO - 10.2136/sssaj2011.0081
M3 - Article
AN - SCOPUS:84863266613
VL - 76
SP - 342
EP - 349
JO - Soil Science Society of America Journal
JF - Soil Science Society of America Journal
SN - 0361-5995
IS - 2
ER -