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ANDO [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-10-12

English

Subject field(s)
  • Soil Science
  • Geology
DEF

A black or dark brown soil formed from volcanic material, with an A horizon rich in organic material.

OBS

The upper A horizon of these soils is dark owing to the presence of organic matter ... This is a low-density friable layer and it overlies a more compact B horizon in which there has been little appreciable change in the content of clay. ... In humid temperate regions they may alter to form podzols and in the humid tropics they may form grumusols.

French

Domaine(s)
  • Science du sol
  • Géologie
DEF

Sol noir produit par l'altération des roches volcaniques (cendres), riche en matière organique et en constituants amorphe (appelés allophanes).

OBS

Ces sols ont un pouvoir d'absorption très élevé, un horizon A relativement épais, friable, riche en matière organique. Ils ont une faible densité relative et sont peu collants. Ils peuvent avoir un horizon (B) sans mouvement visible d'argile. Ils se forment sous des conditions humides ou subhumides.

Spanish

Campo(s) temático(s)
  • Ciencia del suelo
  • Geología
DEF

Suelo negro formado por la alteración de rocas volcánicas, ricas en materia orgánica y en componentes amorfos.

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Record 2 2001-05-03

English

Subject field(s)
  • Soil Science
CONT

andic = horizons containing significant amounts of allophane, imogolite, ferrihydrite or aluminum-humus complexes. That is, soils derived from volcanic ash. Pragmatically, these horizons have low bulk densities (e.g. 0.9 g/cm3), contain volcanic glass, and are thixotropic (particles readily re-arrange when wet and physically disturbed.)

CONT

Ando soils originating from volcanic ash are ... characterized by thick black A horizons, high values of organic carbon contents and high degrees of humification of soil humic acids.

French

Domaine(s)
  • Science du sol
DEF

Se dit d'un sol [...] ayant les propriétés des andosols.

Spanish

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