Abstract
Determination of actual soil water content, matrix potential and water repellency in sandy soil during a dehydration experiment
Highlights
Soil water repellency (SWR) has been observed in forest soils under different climatic conditions, soil types and vegetation covers (Doerr et al, 2000)
It has been proposed that the origin of natural SWR is caused by organic compounds released from different plant species and sources, due to waxes and other organic substances in their tissues
A large number of authors have indicated a variety of factors influencing SWR, such as soil moisture content (SMC) (Chau et al, 2014; Ferreira et al, 2016), incidence of fires (DeBano, 2000; Mataix-Solera and Doerr, 2004), presence of fungi and bacteria species (Schaumann et al, 2007), soil texture and structure (Urbanek et al, 2007; Giovannini and Lucchesi, 1983), surface roughness (Shirtcliffe et al, 2006), aggregation (Jordán et al, 2011; Mataix-Solera et al, 2011; Zavala et al, 2010), organic matter content and chemical composition (Atanassova and Doerr, 2010), acidity, soil type and mineralogy of the clay fraction (Dlapa et al, 2004; Mataix-Solera et al, 2008; Zavala et al, 2009), microbiology (Jex et al, 1985; Savage et al, 1969), and soil organic carbon content (Wijewardana et al, 2016)
Summary
Soil water repellency (SWR) has been observed in forest soils under different climatic conditions, soil types and vegetation covers (Doerr et al, 2000). Under high SMC, SWR is reduced, and a critical soil moisture threshold exists above which the soil becomes wettable. This threshold ranges from 5% (sandy soils) to >30% (clay soils) (Bodí et al, 2012; Poulenard et al, 2004; Regalado and Ritter, 2005). As the soil dries out, SWR tends to be restored, which causes intra-annual, short-term variations in SWR driven by SMC (Keizer et al, 2008). The temperature both in situ and in the laboratory con-
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