The Relationship between Soil Moisture and Soil Water Repellency Persistence in Hydrophobic Soils: Fid-Bau Portal

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

Mohamed Bayad / Henry Wai Chau / Stephen Trolove / Jim Moir / Leo Condron / Moussa Bouray

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.

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

Mohamed Bayad / Henry Wai Chau / Stephen Trolove / Jim Moir / Leo Condron / Moussa Bouray

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.

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

Mohamed Bayad / Henry Wai Chau / Stephen Trolove / Jim Moir / Leo Condron / Moussa Bouray

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.

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Titel:

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

Beteiligte:

Mohamed Bayad (Autor:in) / Henry Wai Chau (Autor:in) / Stephen Trolove (Autor:in) / Jim Moir (Autor:in) / Leo Condron (Autor:in) / Moussa Bouray (Autor:in)

Erschienen in:

Water, Vol 12, Iss 9, p 2322 (2020)

Erscheinungsdatum:

2020

ISSN:

DOI:

https://doi.org/10.3390/w12092322

Medientyp:

Aufsatz (Zeitschrift)

Format:

Elektronische Ressource

Sprache:

Unbekannt

Schlagwörter:

soil water repellency , soil moisture , soil carbon , soil texture , Hydraulic engineering , TC1-978 , Water supply for domestic and industrial purposes , TD201-500

Metadata by DOAJ is licensed under CC BY-SA 1.0

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