NDLI: The Relationship between Soil Moisture and Soil Water Repellency Persistence in Hydrophobic Soils

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The Relationship between Soil Moisture and Soil Water Repellency Persistence in Hydrophobic Soils

Content Provider	MDPI
Author	Bayad, Mohamed Chau, Henry Wai Trolove, Stephen Moir, Jim Condron, Leo Bouray, Moussa
Copyright Year	2020
Abstract	In this work, we modelled the response of soil water repellency (SWR) persistence to the decrease in moisture in drying soils, and we explored the implication of soil particle size distribution and specific surface area on the SWR severity and persistence. A new equation for the relationship between SWR persistence and soil moisture $(θ)$ is described in this paper. The persistence of SWR was measured on ten different hydrophobic soils using water drop penetration time (WDPT) at decreasing levels of gravimetric water content. The actual repellency persistence showed a sigmoidal response to soil moisture decrease, where $R_{a} (θ) = R_{p} / 1 + e^{δ (θ - θ_{c})}$ . The suggested equation enables one to model the actual SWR persistence $(R_{a})$ using $θ$ , the potential repellency $(R_{p})$ and two characteristic parameters related to the shape of the response curve. The two parameters are the critical soil moisture $θ_{c}$ , where the $R_{a}$ increase rate reaches its maximum, and the parameter $δ$ affecting the steepness of the curve at the inflexion point of the sigmoidal curve. Data shows that both soil carbon and texture are controlling the potential SWR in New Zealand pastures.
Starting Page	2322
e-ISSN	20734441
DOI	10.3390/w12092322
Journal	Water
Issue Number	9
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2020-08-19
Access Restriction	Open
Subject Keyword	Water Water Science and Technology Soil Water Repellency Soil Moisture Soil Carbon Soil Texture
Content Type	Text
Resource Type	Article

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