Water Repellency and Critical Soil Water Content in a Dune Sand

2001 ◽  
Vol 65 (6) ◽  
pp. 1667-1674 ◽  
Author(s):  
Louis W. Dekker ◽  
Stefan H. Doerr ◽  
Klaas Oostindie ◽  
Apostolos K. Ziogas ◽  
Coen J. Ritsema
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Repellency ◽  
Dune Sand

SOIL-WATER CONTENT DEPENDENCY OF WATER REPELLENCY IN SOILS

Soil Science ◽  
2007 ◽  
Vol 172 (8) ◽  
pp. 577-588 ◽  
Author(s):  
Lis W. de Jonge ◽  
Per Moldrup ◽  
Ole H. Jacobsen
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Repellency

scholarly journals Impacts of grass removal on wetting and actual water repellency in a sandy soil

2017 ◽  
Vol 65 (1) ◽  
pp. 88-98 ◽  
Author(s):  
Klaas Oostindie ◽  
Louis W. Dekker ◽  
Jan G. Wesseling ◽  
Violette Geissen ◽  
Coen J. Ritsema
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Soil Profile ◽  
Water Repellency ◽  
Bare Soil ◽  
Soil Profiles ◽  
The Impact ◽  
Water Contents ◽  
Soil Water Contents

Abstract Soil water content and actual water repellency were assessed for soil profiles at two sites in a bare and grasscovered plot of a sand pasture, to investigate the impact of the grass removal on both properties. The soil of the plots was sampled six times in vertical transects to a depth of 33 cm between 23 May and 7 October 2002. On each sampling date the soil water contents were measured and the persistence of actual water repellency was determined of field-moist samples. Considerably higher soil water contents were found in the bare versus the grass-covered plots. These alterations are caused by differences between evaporation and transpiration rates across the plots. Noteworthy are the often excessive differences in soil water content at depths of 10 to 30 cm between the bare and grass-covered plots. These differences are a consequence of water uptake by the roots in the grass-covered plots. The water storage in the upper 19 cm of the bare soil was at least two times greater than in the grass-covered soil during dry periods. A major part of the soil profile in the grass-covered plots exhibited extreme water repellency to a depth of 19 cm on all sampling dates, while the soil profile of the bare plots was completely wettable on eight of the twelve sampling dates. Significant differences in persistence of actual water repellency were found between the grass-covered and bare plots.

Soil Water Repellency and Critical Soil Water Content

2015 ◽  
pp. 97-112 ◽  
Author(s):  
Coen J. Ritsema ◽  
Louis W. Dekker ◽  
Klaas Oostindie ◽  
Demie Moore ◽  
Bernd Leinauer
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Repellency ◽  
Soil Water Repellency

scholarly journals Peatland water repellency: Importance of soil water content, moss species, and burn severity

2017 ◽  
Vol 554 ◽  
pp. 656-665 ◽  
Author(s):  
P.A. Moore ◽  
M.C. Lukenbach ◽  
N. Kettridge ◽  
R.M. Petrone ◽  
K.J. Devito ◽  
...  
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Repellency ◽  
Burn Severity ◽  
Moss Species

Post-fire infiltration modeling – some soil physical considerations

2021 ◽  
Author(s):  
Markus Berli ◽  
Rose M. Shillito ◽  
Jeremy J. Giovando ◽  
Nawa Pradhan ◽  
Jang H. (“Jay”) Pak ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Soil Structure ◽  
Early Stage ◽  
Water Repellency ◽  
Soil Physics ◽  
Unsaturated Hydraulic Conductivity ◽  
Soil Hydraulic Parameters

<p>Wildfires can change watershed hydrologic processes and increase the risks for soil erosion, flooding and debris flow after a fire. While fire-induced changes to the soil have significant effects on infiltration and runoff, the physical mechanisms remain unclear. A growing body of research suggests these mechanisms include soil water repellency (SWR) and the alteration of soil structure. The objective of this study was to relate SWR, soil structure, soil moisture to infiltration using a process-based, soil physics approach to better model infiltration into fire-affected soil, The ultimate goal is to improve the prediction of post-fire runoff with process-based hydrology models. Our research shows the effects of SWR and soil structure on infiltration can be captured by the soil hydraulic parameters of sorptivity and hydraulic conductivity, respectively. SWR reduces sorptivity and controls the early stage of infiltration during a storm. Changes in soil structure affect hydraulic conductivity and later stages of infiltration. Additionally, results show SWR can have an effect on unsaturated hydraulic conductivity but does not significantly affect saturated hydraulic conductivity. The study also highlights the important role soil water content plays for post-fire infiltration since both sorptivity and unsaturated hydraulic conductivity are functions of soil water content.</p>

Water repellency in a New Zealand development sequence of yellow brown sands

Soil Research ◽  
1993 ◽  
Vol 31 (5) ◽  
pp. 641 ◽  
Author(s):  
MG Wallis ◽  
DJ Horne ◽  
AS Palmer
Keyword(s):  
New Zealand ◽  
Carbon Content ◽  
Water Content ◽  
Fulvic Acid ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Repellency ◽  
Organic Carbon Content ◽  
Dune Sands ◽  
Acid Ratio

A series of sands on the west coast of the lower North Island, New Zealand, were studied to investigate the effects of time, topography and vegetation cover upon the development of soil water repellency. Severe repellency was measured with the molarity of ethanol droplet (MED) index in the Waitarere and Motuiti dune phase sands, of age <130 years and c. 500 years respectively. In each dune phase, the dune sands were more repellent than the lower lying soils of the sand plains. Low or zero MED values were measured in the 1600-6000 year old Foxton dune phase sands and 10 000-25 000 year old Koputaroa dune phase sandy loams under either pasture or native bush. There was no consistent relationship between bush or pasture cover and repellency severity in the Foxton and Koputaroa soils, however, the species composition of the pasture and bush differed. The Waitarere sand was the most repellent soil, despite a low organic carbon content. The carbon content profiles of most of the soils did not appear to be related to the respective MED profiles of repellency severity. The MED values of the surface layer from five dune sands were generally related inversely to the fulvic acid (FA) content and proportionally to the humic acid to fulvic acid ratio (HA/FA), which were measured in a previous study. The pH of the five soils ranged from 5.61 to 6.89, with no apparent relationship between pH and MED. A study of soil water content indicated that repellency reduced rainfall infiltration into the Waitarere and Motuiti sands and the Himatangi sand, found on elevated sand plains. The most severely repellent sands had the greater variability in soil water content after rainfall.

Effects of surfactant treatments on the wettability of a water repellent grass-covered dune sand

Soil Research ◽  
2005 ◽  
Vol 43 (3) ◽  
pp. 383 ◽  
Author(s):  
Louis W. Dekker ◽  
Klaas Oostindie ◽  
Stanley J. Kostka ◽  
Coen J. Ritsema
Keyword(s):  
Surface Layer ◽  
Water Content ◽  
Soil Water ◽  
Water Repellency ◽  
Water Repellent ◽  
Dune Sand ◽  
Untreated Soil ◽  
Treated Soil ◽  
Water Contents ◽  
Wetting Rate

The objective of this study was to evaluate the effectiveness of the surfactant formulation Primer®604 for amelioration and management of soil water repellency in grass-covered dune sand. The soil is severely to extremely water repellent to a depth of >0.50 m during dry periods. Primer®604 was applied 12 times between 22 April and 23 November 1999. During that period, soil samples were taken in the untreated and treated plot—8 times in transects and 2 times in soil blocks. A total of 4950 samples were collected for assessment of the actual water repellency and for the spatial and temporal variability of the water content of the soil. Resistance to wetting was determined by measuring the wetting rate of field-moist samples. Measurements of water repellency revealed that applications of Primer®604 resulted in less persistent water repellency in the surface layer to a depth of 0.05 m. No effects were observed deeper in the soil profile, likely due to adsorption of the surfactant material in the surface layer. In the surface layer (0–0.025 and 0.025–0.05 m), the critical soil water content below which the soil is actually water repellent in the field was lowered distinctly by the application of Primer®604, potentially due to coating of water repellent particle surfaces by the surfactant. This suggests that the surface layer (0–0.05 m) in the Primer®604-treated soil can dry to lower water contents than in the untreated soil before water repellency is induced. The thatch layer (0–0.025 m) of the treated soil was often found to have slightly higher water contents than of the untreated soil. The surfactant did not equalise the uneven moisture distribution in the soil below the surface layer (0–0.05 m). Primer®604 applications increased the wetting rate of field-moist samples from the thatch layer. This may result in a more effective wetting of the root-zone during rain events or irrigation, and a reduction in runoff.

Sign in / Sign up

Export Citation Format

Share Document