Reference : Influence of rock fragments on hydraulic properties of Ultisols in Ratchaburi Provinc...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/216664
Influence of rock fragments on hydraulic properties of Ultisols in Ratchaburi Province, Thailand
English
Khetdan, Channarong [> >]
Chittamart, Natthapol mailto [> >]
Tawornpruek, Saowanuch [> >]
Kongkaew, Thanuchai [> >]
Onsamrarn, Wattanai [> >]
Garré, Sarah mailto [Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes >]
Sep-2017
Geoderma Regional
Elsevier
10
21-28
Yes
International
2352-0094
[en] loamy-skelletal soil ; rock fragment content ; tensio-infiltrometer ; hydraulic characteristics ; Thailand
[en] In Thailand, stony soils are mainly located in hillside areas. Even though they have physical limitations for agricultural use and they are exposed to a risk for soil erosion, they continue to be used for crop production. A good understanding of the hydraulic characteristics of soils containing an important fraction of rock fragments is crucial for soil and water management in these areas. The objective of this study was to investigate the influence of different rock fragment contents on effective hydraulic properties of skeletal soil with a clay content lower than 35% using measurements of the water retention curve and the hydraulic conductivity. A tension infiltrometer was used to determine the field hydraulic conductivity at four pressure heads (h) of 0, − 30, − 60 and − 120 mm. Soil water retention was determined on a pressure plate between − 33 and − 1500 kPa. Finally, the Hydrus-1D was used to predict soil moisture dynamics using the obtained effective hydraulic parameters. The results show a decreasing water retention capacity with increasing rock fragment content. The saturated hydraulic conductivity decreased with increasing stone contents from 0 to 20%, but then increased for increasing stone content. Contradicting behavior can be observed using field and lab measurements, clearly exposing the need for a better understanding of the functioning of stony soils.
TERRA Teaching and Research Centre - TERRA ; Ingénierie des bio‐systèmes - BIOSE
OT project KULeuven
http://hdl.handle.net/2268/216664
10.1016/j.geodrs.2017.04.001
http://doi.org/10.1016/j.geodrs.2017.04.001

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