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

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

doi:10.3390/w12092322

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

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Department of Soil and Physical Sciences, Lincoln University, Christchurch 7647, New Zealand

AgroBioSciences Program, Mohammed VI Polytechnic University, Benguerir 43150, Morocco

The New Zealand Institute for Plant & Food Research Limited, Private Bag 140, Havelock North 4157, New Zealand

Author to whom correspondence should be addressed.

Water 2020, 12(9), 2322; https://doi.org/10.3390/w12092322

Received: 25 July 2020 / Revised: 13 August 2020 / Accepted: 14 August 2020 / Published: 19 August 2020

(This article belongs to the Special Issue Soil Water Repellency)

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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. View Full-Text

Keywords: soil water repellency; soil moisture; soil carbon; soil texture

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Bayad, M.; Chau, H.W.; Trolove, S.; Moir, J.; Condron, L.; Bouray, M. The Relationship between Soil Moisture and Soil Water Repellency Persistence in Hydrophobic Soils. Water 2020, 12, 2322. https://doi.org/10.3390/w12092322

AMA Style

Bayad M, Chau HW, Trolove S, Moir J, Condron L, Bouray M. The Relationship between Soil Moisture and Soil Water Repellency Persistence in Hydrophobic Soils. Water. 2020; 12(9):2322. https://doi.org/10.3390/w12092322

Chicago/Turabian Style

Bayad, Mohamed, Henry W. Chau, Stephen Trolove, Jim Moir, Leo Condron, and Moussa Bouray. 2020. "The Relationship between Soil Moisture and Soil Water Repellency Persistence in Hydrophobic Soils" Water 12, no. 9: 2322. https://doi.org/10.3390/w12092322

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