Relationship between soil water retention model parameters and structure stability

Eurasian Journal of Soil Science

Amrakh Mamedov¹  Guy J.Levy²  Imanverdi Ekberli³  Coşkun Gülser³  Ilknur Gümüş⁴  Ummuhan Çetin⁴ 

[1] Institute of Soil Science and Agrochemistry and Institute of Botany, ANAS, Baku, Azerbaijan ;Institute of Soil, Water and Environmental Sciences, ARO, The Volcani center, Bet Dagan, Israel ;Ondokuz Mayis University, Faculty of Agriculture, Department of Soil Science and Plant Nutrition, Samsun, Turkey ;Selcuk University, Faculty of Agriculture, Department of Soil Science and Plant Nutrition, Konya, Turkey ;

关键词: Structure stability;    water retention;    pore size;    stability index;    model;   

DOI  :  10.18393/ejss.2016.4.314-321

来源: DOAJ

【 摘 要 】

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 (low matric potential, 0-50 cm, macropores > 60 µm) that were obtained by the high energy moisture characteristic (HEMC) method. The S-shaped water retention curves were characterized by the modified van Genuchten model that provided: (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 (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.

【 授权许可】

Unknown