Soil horizons are the results of pedological processes and classes of soil horizon descriptions are seen as fundamental to soil classification. A fuzzy-sets approach to horizon classes is suggested to deal with the intergrading and multivariate
The A. presents the meeting and its objective: to discuss the various concepts of soil horizons and the role that soil horizons play in soil characterization, classification and mapping. This number of Catena contains selected papers of this meeting.
Principles of soil horizon definition and classification
Soil horizons
The A-B-C system of horizon nomenclature is shown to be unsatisfactory. A set of six principles for establishing horizons is given. A new nomenclature and symbols are proposed for soil horizons. The symbols can be used as map symbols
Genesis of Subsurface horizons of a soil catena in a humid tropical climate (Yaounde, Cameroon)
Dans la région étudiée, le processus de microstructurolyse semble être une condition nécessaire pour la formation, selon le degré de la pente, d'un horizon B cambique, d'un horizon B argillique ou d'un horizon B ferrallitique.
There are many more possibilities for designating horizons and layers in field descriptions than there are when applying the defined diagnostic horizons that are used in Soil Taxonomy. The first set are based on qualitative judgements, the latter
are based on quantitative measurements. The Soil Survey in the United States has found it useful to keep the two kinds of horizon designations separate.
Soil horizon designations; Past use and future prospects
Soil horizons
This paper briefly reviews the history of soil horizon designation use and, in an attempt to promote discussion, presents some possible future developments in the nature and use of these widely used symbols.
Passer à l'avenir. Le rôle des normes et des horizons d'attente
Construction des au-delà et pensée normative avant la postmodernité. Les horizons d'attente. Pour une prise en compte systématique des horizons d'attente. La postmodernité et les nouvelles configurations de l'avenir.
Climatic control of soil acidity in the B horizon of United States soils
Acidité du sol ; Condition climatique ; Etats-Unis ; Géographie physique ; Horizon B ; Lessivage ; Modèle ; Propriété physico-chimique ; Pédogenèse
Corrélation de l'acidité des sols, horizon B, et des variables climatiques. Etude réalisée sur 53 sols des Etats-Unis. Mise en évidence de l'importance du lessivage sur l'évolution du pH.
The pedological development in a sandy loamy soil in Northern Jutland, Denmark, has been described. The profile was strongly leached, a clay migration has taken place, and a marked Bt-horizon was developed. The Bt-horizon was later slightly
degradated. In the eluvial horizon to this Bt-horizon a podzol has been formed, in which a new clay migration has taken place. (Ed.).
Evolution de l'horizon migratoire de Glasgow et d'Edinburgh, de 1851 à 1951. Cet horizon semble s'être étendu à travers le temps. Théorie et méthodologie (mesure de l'horizon migratoire), analyse de régression. (Vnm).
A new system of horizon notation for New Zealand soils
Soil horizons
A new system of horizon notation for New Zealand soils based on that used in England and Wales is outlined. Like the latter, it gives specific definitions of the letter combinations used to label the most commonly occurring horizons, but it differs
Place of horizons in the new french Référentiel Pédologique
Soil horizons
The Référentiel Pédologique is based on four basic notions: Soil Mantles, Solums, Reference Horizons and References. Two major innovations have been introduced: 1) the real objects under investigation are Soil Mantles; 2) the system
is not hierarchical but typological. This system permits one to deal not only with vertical sequences of horizons but also with topo-sequences and soil-systems.
INTERPRETATION GENETIQUE D'UN HORIZON PEDOLOGIQUE PROFOND FERRO-ARGILIQUE EN FORET DE FONTAINEBLEAU
L'ETUDE D'UN HORIZON OCRE ARGILEUX, SITUE SUR CALCAIRE, A LA BASE D'UN DEPOT DE SABLES SOUFFLES, A PERMIS DE DETERMINER L'ORIGINE COMPLEXE DE CET HORIZON: UNE PEDOGENESE ANCIENNE, COMPRENANT UNE DECARBONATATION ET LA FORMATION DE GOETHITE, AVANT LE
DEPOT DES SABLES SOUFFLES| UNE ACCUMULATION D'ARGILE SUR L'HORIZON ARGILEUX PREEXISTANT, PAR SUITE DU LESSIVAGE DES SABLES SOUFFLES, A PARTIR DU WURM.