Vacuum drying water-repellent sandy soil: Anoxic conditions retain original soil water repellency under variable soil drying temperature and air pressure

Wong, Enoch V.S.; Ward, Phil; Murphy, Daniel V.; Leopold, Matthias; Barton, Louise

doi:10.1016/j.geoderma.2020.114385

Cited by 7 publications

(6 citation statements)

References 40 publications

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“…We also found that SWR positively correlated with soil aggregate stability and SOC (Figure 6). SWR can limit soil water absorption rate, which favors reducing soil water infiltration rate and air pressure in soil (Shillito et al., 2020; Wong et al., 2020). It can prevent damage from rapid water infiltration to enhance soil aggregate stability and then promote the accumulation of SOC (Lamparter et al., 2009; Zheng et al., 2016).…”

Section: Discussionmentioning

confidence: 99%

“…We also found that the effect of tillage management on yield in 2018 was consistent with the overall trend (2003-2018) (Figure S2), which indicates that this result under the climate condition in this study may be applicable to most years in the long-term tillage experiment. Hence, we used air-dried soil samples to measure SWR according to most previous studies that also used dried soil samples (Behrends et al, 2019;Wang & Wallach, 2020;Wong et al, 2020), especially for the sorptivity method. Detailed information about the device can be found in Li et al (2021).…”

Section: The Characteristics Of Soil Water Repellencymentioning

confidence: 99%

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Factors governing soil hydrological function under long‐term tillage practices: Insight into soil water repellency

Liu

et al. 2023

Soil Science Soc of Amer J

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Drought is increasingly common due to frequent occurrences of extreme weather events, which further increases soil water repellency (SWR). It could reinforce the effect of SWR on soil functions under conservation tillage systems. However, the relationship between SWR and soil hydrological function is still unclear. We studied the impacts of SWR and soil structure on soil hydrological function. Three treatments were conducted in a long-term tillage experiment: conventional tillage (CT), reduced tillage (RT), and no-tillage (NT). Tillage, soil depth, and growth period had significant influences on SWR, soil structure (i.e., penetration resistance [PR], total porosity [TP], and mean weight diameter [MWD]), and soil hydrological functions (i.e., water storage, least limiting water range [LLWR], and plant available water). Compared to CT, NT and RT increased the water repellency index (RI) in 0-20 cm by 13.8%-40.1% and 6.5%-18.2% during the growth period. RI played a prominent role in increasing soil water storage compared to soil TP, PR, MWD, and SOC. PR was the most critical influence on LLWR compared to other variables. A structural equation model revealed that SWR directly affected soil hydrological function, whereas the effect of SWR (0.24) was smaller than that of soil structure (0.67). In addition, soil structure had a direct influence on SWR, indicating that the effect of SWR could be regulated by soil structure. Overall, this study showed a link between SWR and soil hydrological function and provides deeper fundamental insights into the role of SWR on the sustainability of conservation tillage.

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Section: Discussionmentioning

confidence: 99%

Section: The Characteristics Of Soil Water Repellencymentioning

confidence: 99%

Factors governing soil hydrological function under long‐term tillage practices: Insight into soil water repellency

Liu

et al. 2023

Soil Science Soc of Amer J

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“…The threshold soil water content for the water‐repellent sandy soil was determined by first examining how SWR responded to a range of soil water contents. Five replicates of ~34.0 g of soil in glass Petri‐dishes (90.0 mm diameter, 15.0 mm depth) were vacuum dried (relative humidity reached ~1%) under anoxic conditions at 20.0°C and 1.3 kPa using the technique described in Wong et al (2020). The soil samples were exposed to one of seven levels of relative humidity (10–100%) using different saturated salt solutions (ZnCl 2 , 10% relative humidity; MgCl 2 , 34%; NaBr, 59%; NaCl, 75%; K 2 HPO 4 , 90–95%; KH 2 PO 4 , 97%; distilled water, 100%; O'Brien, 1948) to generate a range of soil water contents, and then incubated in desiccators in a temperature‐controlled room at 20.0 ± 1.0°C for 6 days.…”

Section: Methodsmentioning

confidence: 99%

“…Water‐repellent sandy soil (51.4 mg; <2.0 mm sieved) was analysed for monolayer gravimetric water content by obtaining the water adsorption isotherm using a dynamic vapour sorption automated moisture sorption instrument (DVS, Surface Measurement Systems, London, United Kingdom). A dry mass of soil was achieved by drying at 20.0°C under a continuous flow of dry N 2 (10.0 ml min −1 ) in the DVS for 3 h. Low temperature and N 2 drying were selected to avoid the effects of temperature and aeration on SWR (Wong et al, 2020). The water‐repellent soil was exposed to an increasing relative humidity or partial pressure, P / P 0 (e.g., 10% relative humidity is equivalent to partial pressure of 10%/100% or 0.10 P / P 0 ) to generate a water adsorption isotherm.…”

Section: Methodsmentioning

confidence: 99%

Condensation of capillary water and decreased surface energy cause increased soil water repellency in sandy soil

Wong

Ward

Leopold

et al. 2022

European J Soil Science

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Predicting soil water availability to crops in water‐repellent sandy soil is complicated as soil water repellency (SWR) responds non‐linearly to soil water content. Others have hypothesised that the development of a monolayer of water molecules results in SWR increasing before SWR declines with a further increase in soil water content. In a previous study, we found that SWR increases when above 0.28–0.86% threshold soil water content. Thus, our objective was to determine the underlying mechanisms responsible for why SWR increases when above a certain threshold soil water content in a sandy soil. A water adsorption isotherm was constructed by exposing a water‐repellent sandy soil to increasing relative humidity (dynamic vapour sorption technique) to evaluate if the development of a monolayer of water molecules was responsible for the increased SWR response. The increased SWR when above 0.66% threshold soil water content was found to coincide with the capillary condensation of water in the soil. The inverse gas chromatography technique was used for the first time in soil particles' surface energy analysis to investigate why SWR increases when above the threshold soil water content by determining the total, dispersive (non‐polar), and specific surface (polar) energy of the soil at two relative humidities (0% and 90%). Wettable sandy soil (98% soil organic carbon removed) was included as a control to further assess if soil organic carbon in the water‐repellent soil influences the surface energy of the soil. The mean of total, dispersive, and specific surface energy decreased for both wettable and water‐repellent sandy soils when exposed to 90% relative humidity, suggesting that there was limited effect of soil carbon on the increased SWR when above the threshold soil water content since most organic carbon was removed from the wettable soil. We also investigated if there is any difference in the surface energy heterogeneity when exposed to 90% relative humidity to gain insight into surface chemistry heterogeneity of the soil particles' surfaces. Exposing soils to 90% relative humidity decreased the heterogeneity of the total and dispersive surface energy of both wettable and water‐repellent sandy soil indicating a more uniform surface chemistry than when exposed to 0% relative humidity. Highlights Examined why soil water repellency (SWR) in a sandy soil increases at low soil water content. Explored underlying mechanisms via water adsorption isotherm and surface energy of a sandy soil. Increased SWR coincided with capillary water condensation and is likely due to counterion effects. Quantitative data presented new mechanisms on why SWR increases with increasing soil water content.

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“…At each point, the soil samples were taken at three soil layers (0.00-0.10, 0.10-0.20, and 0.20-0.30 m) using the ring knife method (Xu et al, 2022), and the latitude and longitude coordinates and surrounding environment information were recorded (Figure 1c) (McAlary et al, 2009;Sousa et al, 2022). Soil moisture was obtained using the soil drying method (Wong et al, 2020).…”

Section: In Situ Smmentioning

confidence: 99%

Inversion of soil moisture and its feedback on ecological restoration in arid and semi-arid areas of northwest China

Liu¹,

Yuanyuan²,

Zhou³

et al. 2022

Revista Brasileira De Ciência Do Solo

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Soil moisture (SM) plays an important role in regulating the global water cycle, especially in arid areas, and is one of the main indicators of ecological environmental health. Although traditional methods can accurately measure SM at a single sample site, they are limited in large-scale and dynamic SM monitoring. Therefore, we used the Landsat images as the data source and the soil adjusted vegetation index (SAVI) to build the adjusted SAVI (aSAVI) index by modifying the soil adjustment parameter L and introducing the short-wave infrared band. According to the theory of temperature vegetation dryness index (TVDI) and feature space, we introduced a model, combined the measured SM data (Minqin Basin, China) through a comparative analysis of four vegetation indices (NDVI, SAVI, MSAVI, aSAVI) determine the optimal model. Taking the Minqin Basin as the study area, the spatiotemporal variation characteristics of SM in three sub-regions (the entire study area, irrigated region, and periphery of the irrigated regions) were quantitatively analyzed and compared in four different periods: pre-Comprehensive Treatment Program of the Shiyang River Basin (pre-CTSRB) (2000)(2001)(2002)(2003)(2004)(2005), CTSRB I (2006-2010), CTSRB II (2011-2016), and CTSRB-end (2017-2021) to evaluate the ecological restoration effects of treatment programs from the SM perspective. The results showed that: 1) SM values derived from TVDI inversion and the aSAVI were more accurate, and the model sensitivity decreased with soil depth; 2) the mean value of SM fluctuated across the four periods but decreased slightly over the entire time series. The spatial variations of the SM were characterized by a "descending then ascending" trend. Soil moisture increased in 21.35 % of areas at 0.00-0.10 m in the past 22 years, and 59.66 % at 0.10-0.20 m. There was a negative correlation between the mean variation trend of SM and the percentage of area where SM fell in different periods; 3) the treatment program positively affected the ecological restoration of the Minqin Basin from the SM perspective. The area where SM increased was larger than that of decreasing SM, especially in 0.10-0.20 m soil layer. The increase can promote growth and confer resistance to desertification.

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Vacuum drying water-repellent sandy soil: Anoxic conditions retain original soil water repellency under variable soil drying temperature and air pressure

Cited by 7 publications

References 40 publications

Factors governing soil hydrological function under long‐term tillage practices: Insight into soil water repellency

Factors governing soil hydrological function under long‐term tillage practices: Insight into soil water repellency

Condensation of capillary water and decreased surface energy cause increased soil water repellency in sandy soil

Inversion of soil moisture and its feedback on ecological restoration in arid and semi-arid areas of northwest China

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