Genesis and evolution of the fragipan in Albeluvisols in the Precarpathians in Ukraine

Auteur(s) et Affiliation(s)

NIKORYCH, V.A.

Yuri Fedkovich Chernivtsi National Univ., Dept. of Soil Science, Chernivtsi, Ukraine

SZYMAŃSKI, W.

Jagiellonian Univ., Inst. of Geography and Spatial Management, Dep. of Pedology and Soil Geography, Cracow, Pologne

POLCHYNA, S.M.

Yuri Fedkovich Chernivtsi National Univ., Dept. of Soil Science, Chernivtsi, Ukraine

SKIBA, M.

Jagiellonian Univ., Inst. of Geological Sciences, Dep. of Mineralogy, Petrology and Geochemistry, Cracow, Pologne

Description :
This study aims to: 1) explain the genesis of the fragipan in Albeluvisols in the Precarpathians in Ukraine, basing on micromorphological studies and quantitative mineral composition analyses and 2) propose a model of pan formation and evolution under moderately humid climate conditions. The abundance of clay coatings and clay infillings as well as iron–clay cutans within the studied fragipan indicates that the formation of the pan is related to the translocation of colloids (clay minerals and iron hydroxides) from upper soil horizons. This leads to the filling of voids in the Btx horizon and a decrease in the porosity and hydraulic conductivity of the pan. The enrichment of the fragipan in clay minerals (especially in swelling clay minerals) is responsible for the subsequent degradation of the pan due to wetting and drying, leading to the swelling and shrinking of soil material. Formation and development of bleached tongues are connected with the infiltrating water by vertical cracks.

Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2014, n°. 119, p. 154-165, nombre de pages : 12, Références bibliographiques : 2 p.

Date :
2014

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena

Langue :
Anglais