Soil Physical Properties and Processes

Sadeghi, Morteza; Babaeian, Ebrahim; Arthur, Emmanuel; Jones, Scott B.; Tuller, Markus

doi:10.1002/9781119304418.ch7

Cited by 4 publications

(3 citation statements)

References 206 publications

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“…at a given matric potential, the water content obtained via wetting is commonly below that retained via drying). To explain this phenomenon, mechanisms such as the ink-bottle effect, differences in advancing and receding liquid-solid contact angles, entrapped air and swelling and shrinking are generally accepted (Sadeghi, Babaeian, Arthur, Jones, & Tuller, 2018;Tuller & Or, 2005b). Based on these mechanisms, several models were developed to account for soil water retention hysteresis in the wet region (Kool & Parker, 1987;Pedroso & Williams, 2010;Rudiyanto et al, 2015;van Dam, Wösten, & Nemes, 1996;Zhuang, Bezerra Coelho, Hassanizadeh, & van Genuchten, 2017).…”

Section: Introductionmentioning

confidence: 99%

Clay content and mineralogy, organic carbon and cation exchange capacity affect water vapour sorption hysteresis of soil

Arthur

Tuller

Møldrup

et al. 2019

European J Soil Science

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The hysteretic behaviour of the dry region (<−1.5 MPa) of the soil water characteristic, which is of the essence for accurate characterization and modelling of bio‐physicochemical soil processes under dry conditions, is well documented. However, knowledge about how to best quantify water vapour sorption hysteresis and about the effects of soil properties on dry‐region hysteretic behaviour is limited. To overcome this knowledge gap, we proposed a new method for quantifying sorption hysteresis and evaluated its applicability based on measured sorption isotherms of four source clay minerals and 147 soil samples. Furthermore, the effects of clay mineralogy, clay content, soil organic carbon (SOC) and cation exchange capacity (CEC) on the magnitude of sorption hysteresis were investigated. For the clay minerals, kaolinite did not exhibit hysteretic behaviour, illite showed some hysteresis, whereas Na‐ and Ca‐smectite exhibited strong hysteretic behaviour. The average hysteresis, corrected for clay and SOC contents, was strongly reflective of the dominant clay mineralogy of the soil samples. For the soil samples with low SOC content, the average hysteresis significantly increased with increasing clay content (R2 = 0.92), except for the kaolinite‐rich samples (R2 = 0.35). The SOC‐rich samples that exhibited illitic clay mineralogy and similar soil texture showed a significant increase in average hysteresis with increasing organic carbon content (R2 = 0.93). For all soil samples combined, the CEC was the strongest indicator for the magnitude of water vapour sorption hysteresis. Highlights A new index for quantification of soil vapour sorption hysteresis was proposed Large SOC and clay content increased sorption hysteresis For soil samples, dominant clay mineralogy controlled the magnitude of hysteresis Cation exchange capacity was the best predictor of hysteresis for all soil types

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Section: Introductionmentioning

confidence: 99%

Clay content and mineralogy, organic carbon and cation exchange capacity affect water vapour sorption hysteresis of soil

Arthur

Tuller

Møldrup

et al. 2019

European J Soil Science

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“…In practice, however, it is not possible to attain complete dry or saturated conditions. There is always a residual moisture content, θ r , present under dry conditions, and it is virtually impossible to completely de‐air soil as air bubbles remain entrapped in dead‐end pores and cavitation nuclei are held tightly in crevices of rough particle surfaces (Sadeghi et al, 2018). To account for residual moisture, relative saturation is commonly defined as

S_{e} = \frac{θ_{v} - θ_{r}}{θ_{s} - θ_{r}}

Under wet conditions, due to air entrapment in the soil pores, the maximum attainable S e ranges from about 0.94 to 0.97 (−) for fine‐textured (i.e., clay) and coarse‐textured (i.e., sand) soils, respectively.…”

Section: Definition Of Smmentioning

confidence: 99%

“…The subsequent increase in regulations and paperwork related to radioactive devices has made NPs impractical for most users. Additional information about the practical and theoretical aspects of neutron scattering for SM measurements are provided in Sadeghi, Babaeian, et al (2018).…”

Section: Ground‐based Point Measurements and Sensor Networkmentioning

confidence: 99%

Ground, Proximal, and Satellite Remote Sensing of Soil Moisture

Babaeian

Sadeghi

Jones

et al. 2019

Reviews of Geophysics

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365

205

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Soil moisture (SM) is a key hydrologic state variable that is of significant importance for numerous Earth and environmental science applications that directly impact the global environment and human society. Potential applications include, but are not limited to, forecasting of weather and climate variability; prediction and monitoring of drought conditions; management and allocation of water resources; agricultural plant production and alleviation of famine; prevention of natural disasters such as wild fires, landslides, floods, and dust storms; or monitoring of ecosystem response to climate change. Because of the importance and wide‐ranging applicability of highly variable spatial and temporal SM information that links the water, energy, and carbon cycles, significant efforts and resources have been devoted in recent years to advance SM measurement and monitoring capabilities from the point to the global scales. This review encompasses recent advances and the state‐of‐the‐art of ground, proximal, and novel SM remote sensing techniques at various spatial and temporal scales and identifies critical future research needs and directions to further advance and optimize technology, analysis and retrieval methods, and the application of SM information to improve the understanding of critical zone moisture dynamics. Despite the impressive progress over the last decade, there are still many opportunities and needs to, for example, improve SM retrieval from remotely sensed optical, thermal, and microwave data and opportunities for novel applications of SM information for water resources management, sustainable environmental development, and food security.

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