Gelisol


Gelisol

soil
 one of the 12 soil orders of the U.S. Soil Taxonomy (soil). Gelisols are perennially frozen soils of the Arctic and Antarctic regions, but they are also found at extremely high elevations in the lower latitudes. They are fragile, easily eroded soils, and their location near the polar ice caps makes them important indicators of the early signs of global warming. Covering approximately 13 percent of the total continental land area on Earth, Gelisols are found primarily in Russia and Canada, with minor occurrences in Alaska in the United States, and in Antarctica.

      Gelisols are characterized by the presence of permafrost (soil temperature below 0 °C [32 °F]) for at least two years in succession within two metres (about six feet) of the land surface. The permafrost layer may have a high organic carbon content, like Histosols (Histosol), or may exhibit substantial vertical mixing of the soil owing to cycles of freezing and thawing, resulting in structures similar to those found in Vertisols (Vertisol). In climates with significant precipitation and periods of annual warming, the soil distribution may be highly discontinuous. Gelisols with thick surface organic layers predominate in the Low Arctic, whereas those that exhibit pronounced vertical mixing are common in the High and Middle Arctic, where they are identified by hilly terrain and a landscape patterned with polygon-shaped cracking. Gelisols differ from Entisols (Entisol), Histosols, Inceptisols (Inceptisol), and Vertisols solely by the additional presence of permafrost.

* * *


Universalium. 2010.

Look at other dictionaries:

  • Gelisol — Als Gelisol bezeichnet man gemäß der USDA Bodenklassifikation leicht bis gemäßigt saure Böden der nördlichen Polarregion, die sich dadurch auszeichnen, dass sie selbst im Sommer ab einer Tiefe von weniger als zwei Metern gefroren sind. Man findet …   Deutsch Wikipedia

  • gélisol — ● gélisol nom masculin Sol soumis au gel, constitué d un mollisol en surface et d un pergélisol en profondeur …   Encyclopédie Universelle

  • gelisol — gelisól s. n. Trimis de siveco, 10.08.2004. Sursa: Dicţionar ortografic …   Dicționar Român

  • Gelisols — Gelisol a Gelisol profile Used in: USDA soil taxonomy Profile: OAC …   Wikipedia

  • Paleopedological record — The paleopedological record is, essentially, the fossil record of soils. The paleopedological record consists chiefly of paleosols buried by flood sediments, or preserved at geological unconformities, especially plateau escarpments or sides of… …   Wikipedia

  • Soil Tax — Als USDA Bodenklassifikation bezeichnet man eine Klassifikation von Böden, die das amerikanische Landwirtschaftsministerium (US Department of Agriculture, USDA Natural Resources Conservation Service, NRCS) herausgegeben hat. Sie stellt neben der… …   Deutsch Wikipedia

  • Soil Taxonomy — Als USDA Bodenklassifikation bezeichnet man eine Klassifikation von Böden, die das amerikanische Landwirtschaftsministerium (US Department of Agriculture, USDA Natural Resources Conservation Service, NRCS) herausgegeben hat. Sie stellt neben der… …   Deutsch Wikipedia

  • Сезонномёрзлый слой —         (a. seasonally frozen layer; н. jahreszeitgemaβ gefrorene Schicht; ф. gelisol saisonnier, merzlota saisonniere; и. estrato de congelacion temporal) верх. горизонт горн. пород (грунтов), образующийся в осенне зимнее время вследствие… …   Геологическая энциклопедия

  • Сезонноталый слой —         (a. seasonally thawed layer; н. saisonbedingt aufgetaute Schicht; ф. merzlota saisonniere, gelisol saisonnier; и. estrato deshelado temporal) верх. горизонт горных пород (грунтов), образующийся в весенне летнее время вследствие сезонного… …   Геологическая энциклопедия

  • Clasificación de suelos — Colores de suelos. La clasificación de suelos es una categorización sistemática de suelos basado en características distintivas y en criterios de uso. Una clasificación de suelos es muy dinámica, en si mismo de la estructura del sistema, a las… …   Wikipedia Español


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.