Influence of rock fragments on hydraulic properties of Ultisols in Ratchaburi Province, 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.

Research Center/Unit :

TERRA Teaching and Research Centre - TERRA
BIOSE - Ingénierie des Bio‐Systèmes - ULiège

Disciplines :

Earth sciences & physical geography

Author, co-author :

Khetdan, Channarong

Chittamart, Natthapol

Tawornpruek, Saowanuch

Kongkaew, Thanuchai

Onsamrarn, Wattanai

Garré, Sarah ; Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes

Language :

English

Title :

Influence of rock fragments on hydraulic properties of Ultisols in Ratchaburi Province, Thailand

Publication date :

September 2017

Journal title :

Geoderma Regional

eISSN :

2352-0094

Publisher :

Elsevier

Volume :

Pages :

21-28

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://doi.org/10.1016/j.geodrs.2017.04.001

Funders :

KU Leuven - Katholieke Universiteit Leuven

Available on ORBi :

since 05 December 2017

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