Relationship between soil water retention model parameters and structure stability

Authors : Amrakh Mamedov, Imanverdi Ekberli, Coşkun Gülser, Ilknur Gümüş, Ummuhan Çetin, Guy J Guy Levy

Pages : 314-321

Doi:10.18393/ejss.2016.4.314-321

View : 50 | Download : 13

Publication Date : 2016-09-09

Article Type : Research Paper

Abstract :Studying and modeling the effects of soil properties and management on soil structure and near saturation water retention is vital for the development of effective soil and water conservation practices. The contribution of soil intrinsic properties and extrinsic conditions to structure stability was inferred, in quantitative terms, from changes in water retention curves near saturation insert ignore into journalissuearticles values(low matric potential, 0-50 cm, macropores > 60 µm); that were obtained by the high energy moisture characteristic insert ignore into journalissuearticles values(HEMC); method. The S-shaped water retention curves were characterized by the modified van Genuchten model that provided: insert ignore into journalissuearticles values(i); the model parameters α and n, which represent the location of the inflection point and the steepness of the water retention curve, respectively; and insert ignore into journalissuearticles values(ii); the soil structure index, SI=VDP/MS, where VDP is the volume of drainable pores, and MS is the modal suction. Model parameters, claculated by the soil-HEMC model, were related to soil properties and hence soil water retention properties were linked to measured characteristics in several field and laboratory experiments. Soil SI increased exponentially with the increase in α and the decrease in n, while the relationship between SI and α/n was linear. An improved description of the water retention and its link to pore and apparent aggregate size distribution, by using the model parameters α and n, could potentially assist in the selection of management practices for obtaining the most suitable type of soil structure depending on the desired soil function. 
Keywords : Structure stability, water retention, pore size, stability index, model

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