Lixisol

Lixisol

▪ FAO soil group
 one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO) (soil). Lixisols develop on old landscapes in a tropical climate with a pronounced dry season. Their age and mineralogy have led to low levels of plant nutrients and a high erodibility, making agriculture possible only with frequent fertilizer applications, minimum tillage, and careful erosion control. Perennial crops are thus more suitable for these soils than root or tuber crops. They occupy just under 3.5 percent of the continental land area on Earth, mainly in east-central Brazil, India, and West Africa.

      Lixisols are defined by the presence of a subsurface layer of accumulated kaolinitic clays (kaolinite), where at least half of the readily displaceable ions are calcium, magnesium, sodium, or potassium, but they are also identified by the absence of an extensively leached layer below the surface horizon (uppermost layer). They are related to the Oxisol order of the U.S. Soil Taxonomy. Related FAO soil groups originating in tropical climates and also containing layers with clay accumulations are Acrisols (Acrisol) and Nitisols (Nitisol).

* * *


Universalium. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Lixisol — Lixisols are soils with subsurface accumulation of low activity clays and high base saturation. [ [http://www.fao.org/ag/agl/agll/wrb/soilres.stm WRB Map of World Soil Resources] ] They develop under intensive tropical weathering conditions. [… …   Wikipedia

  • Lixisol — Verbreitung von Lixisolen Lixisole sind Böden mit einer Akkumulation von Tonmineralen geringer Austauschkapazität und hoher Basensättigung.[1] Lixisole weisen verschiedene Bodenhorizonte auf: unter einem A Horizont einen Auswaschungshorizont (E… …   Deutsch Wikipedia

  • World Reference Base — Die World Reference Base for Soil Resources (Abkürzung WRB) ist eine Bodenklassifikation, die als internationales Kommunikationsmittel für den Fachbereich Boden geschaffen wurde. Sie ist mehr oder weniger weltweit gültig, um Informationen über… …   Deutsch Wikipedia

  • World Reference Base for Soil Resources — La World Reference Base for Soil Resources (WRB: acrónimo (en inglés) Base referencial mundial para recursos de suelos), es el estándar internacional taxonómico de sistema de Clasificación de suelos respaldado por la International Union of Soil… …   Wikipedia Español

  • Acrisol — ▪ FAO soil group  one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO) (soil). Acrisols form on old landscapes that have an undulating topography and a humid tropical climate. Their natural… …   Universalium

  • Alisol — ▪ FAO soil group  one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO) (soil). Alisols are highly acidic, poorly drained soils prone to aluminum toxicity and water erosion. Liming and fertilization …   Universalium

  • Nitisol — ▪ FAO soil group  one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO) (soil). Occupying 1.6 percent of the total land surface on Earth, Nitisols are found mainly in eastern Africa at higher… …   Universalium

  • FAO Soil Classification System — ▪ Table Soil classification system of the Food and Agriculture Organization   soil group  abbrevi ation defining  characteristics name derivation percent of Earth s land area See as table: Soils defined by parent material   Andosol AN volcanic… …   Universalium

Share the article and excerpts

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