Reference : Dynamic of soil drying close to saturation: What can we learn from a comparison betwe...
Scientific journals : Article
Life sciences : Agriculture & agronomy
http://hdl.handle.net/2268/210394
Dynamic of soil drying close to saturation: What can we learn from a comparison between X-ray computed microtomography and the evaporation method?
English
Parvin, Nargish mailto [Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes >]
Beckers, Eléonore mailto [Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes >]
Plougonven, Erwan mailto [Université de Liège > Department of Chemical Engineering > Génie chimique - Procédés et développement durable >]
Léonard, Angélique mailto [Université de Liège > Department of Chemical Engineering > Génie chimique - Procédés et développement durable >]
Degré, Aurore mailto [Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes >]
10-May-2017
Geoderma
Elsevier Science
302
Yes (verified by ORBi)
International
0016-7061
[en] Soil water retention curve ; X-ray CT ; Evaporation method
[en] The soil water retention curve (SWRC) is a unique relationship between water content and soil water potential.
SWRC in near saturation gives the dimension of soil macroporosity which plays an important role in water
translocation into soil. Thus, the accurate measurement of SWRC is crucial. The aim of this study is to compare
SWRC obtained through two different methods: X-ray computed microtomography (X-ray CT) and evaporation
method by HYPROP device. Three different depths (0–10, 25–30 and 45–60 cm) are considered for soil
sampling. The results showed significant differences in SWRC between the techniques. The SWRC from X-ray CT
showed more volumetric water content at 25–30 cm (0.044) and 45–60 cm (0.024) than evaporation at
saturation (0 kPa) in cases where the macroporosity was higher. Macropores may have connections with
neighbouring pores of smaller sizes. Hence we assume that these pores can be observed through X-ray CT but
cannot be evaluated by evaporation. As macropores with narrow opening do not evaporate at very low tension.
These pores therefore got empty at relatively higher tension. Consequently, SWRC near saturation appeared
rather flatter with the evaporation method where the X-ray CT presented deviation. Accordingly, interpretation
of macro pores from SWRC through evaporation method would give comparatively smaller volume of
macropores than they really are. Pore morphology and other hydraulic functions of soil, for example, mean
connection surface of pores, hydraulic conductivity, and the efficiency of water conducting macropores also
support the X-ray CT findings.
http://hdl.handle.net/2268/210394
10.1016/j.geoderma.2017.04.027

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