oxisol


oxisol
/ok"si sawl', -sol'/, n.
a thick, weathered soil of the humid tropics, largely depleted in the minerals that promote fertility, and characteristic of the Amazon and Congo basins.
[1955-60; OX- + -I- + -SOL]

* * *

 one of the 12 soil orders in the U.S. Soil Taxonomy (soil). Oxisols form principally in humid tropical zones under rainforest, scrub and thorn forest, or savanna vegetation on flat to gently sloping uplands. They are typically found on old landscapes that have been subject to shifting cultivation for millennia. Intensive plantation agriculture is possible if lime and fertilizers are applied with careful management to prevent erosion. Oxisols occupy 7 percent of the nonpolar continental land area on Earth, mostly in the equatorial regions of South America and Africa.

      Oxisols are characterized by a thick subsurface layer (the oxic horizon) that contains kaolin (kaolinite)-group clay minerals and metal oxides in a finely textured matrix with very little or no easily weathered silicates. Ferromagnesian parent materials (minerals containing both iron and magnesium) are also thought to be essential, since loss of silica and oxidation of iron are important pathways in Oxisol formation.

      Oxisols differ from Ultisols (Ultisol) in not having a layer of translocated (migrated) clay accumulation and from Vertisols (Vertisol) in not containing significant amounts of swelling clay minerals.

* * *


Universalium. 2010.

Look at other dictionaries:

  • Oxisol — profile Used in: USDA soil taxonomy Profile: OABC …   Wikipedia

  • Oxisol — Un oxisol est un ordre de sol selon la classification des sols du Département de l Agriculture des États Unis (USDA Soil Taxonomy). Ce type de sol se trouve majoritairement comme sol de la forêt tropicale humide, entre 15 25 degrés nord et sud de …   Wikipédia en Français

  • Oxisol — Als Oxisol bezeichnet man gemäß der USDA Bodenklassifikation stark verwitterte tropische Böden, wie man sie häufig in den tropischen Regionen Afrikas und Südamerikas findet, in denen ein stabiles Klima mit hoher Luftfeuchtigkeit herrscht. Nach… …   Deutsch Wikipedia

  • Oxisol — Oxisol,   ein Bodentyp, Latosol …   Universal-Lexikon

  • Oxisol — Perfil de un Oxisol. Los Oxisoles son un orden en la taxonomía de suelos USDA, bien conocidos por su presencia en selvas tropicales húmedas, 15 25º norte y sur del ecuador terrestre. Algunos oxisoles habían sido previamente clasificados como… …   Wikipedia Español

  • oxisol — noun A soil type, containing at all depths no more than ten percent weatherable minerals, and low cation exchange capacity. They are always red or yellowish and best known for their occurrence in tropical rain forest …   Wiktionary

  • oxisol — /ok si sawl , sol /, n. a thick, weathered soil of the humid tropics, largely depleted in the minerals that promote fertility, and characteristic of the Amazon and Congo basins. [1955 60; OX + I + SOL] …   Useful english dictionary

  • Terra preta — Dieser Artikel wurde wegen inhaltlicher Mängel auf der Qualitätssicherungsseite des Portals Geowissenschaften eingetragen. Dies geschieht, um die Qualität der Artikel im Themengebiet Geowissenschaften zu steigern. Bitte hilf mit, die Mängel zu… …   Deutsch Wikipedia

  • Terra Preta de Indio — Terra preta L oxisol (à gauche) et la Terra Preta (à droite) La terre noire (terra preta en portugais) est un sol anthropogénique (c est à dire d origine humaine) d une fertilité exceptionnelle due à des concentrations particulièrement élevées en …   Wikipédia en Français

  • Terra preta — L oxisol (à gauche) et la Terra Preta (à droite) La terre noire (terra preta en portugais) est un type de sol sombre d’origine humaine et d une fertilité exceptionnelle due à des concentrations particulièrement …   Wikipédia en Français


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.