Title: Revisiting ferrolysis processes in the formation of Planosols for rationalizing the soils with stagnic properties in WRB
Authors: Van Ranst, E ×
Dumon, M
Tolossa, A.R
Cornelis, J.-T
Stoops, G
Vandenberghe, R.E
Deckers, Seppe #
Issue Date: 2011
Publisher: Elsevier Scientific Pub. Co.
Series Title: Geoderma vol:163 issue:3-4 pages:265-274
Abstract: Planosols have been recognized as a Major Soil Group right from the beginning in the legend of the FAO/Unesco
Soil Map of the World. Also in WRB system it maintained that position at Reference Soil Group level on
the account that a major pedogenetic process, ferrolysis, is underlaying the severe stagnic properties that
characterize this group. With the introduction of Stagnosols in WRB in 2006, it appears that a serious overlap
has been introduced at Reference Soil Group level. This paper aims to throw new light on the genesis of
Planosols, drawing from new soil surveys conducted in the south-western Ethiopian highlands. Representative
soil profiles were sampled and analyzed for their physico-chemical, mineralogical and micromorphological
properties, and a hypothesis has been forwarded to explain the formation of these Planosols. The conclusion is
that it is highly unlikely that ‘ferrolysis’ can be called upon to explain the genesis of Planosols in the Ethiopian
highlands, and an alternative geogene hypothesis is put forward to explain the formation of these duplex soils.
As Ethiopia is one of the mainstays of Planosols, it is suggested that WRB rethinks its strategy on soils with
stagnic properties as there is room for rationalization in view of a generally felt overlap between Planosols and
Stagnosols. WRB could rationalize by sub-dueing either the Planosols or the Stagnosols to a lower level
ISSN: 0016-7061
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division Soil and Water Management
× corresponding author
# (joint) last author

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