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In both the World Reference Base for Soil Resources (WRB) [1] and the USDA soil taxonomy, [2] a Histosol is a soil consisting primarily of organic materials. They are defined as having 40 centimetres (16 in) or more of organic soil material starting within 40 cm from the soil surface.
The World Reference Base for Soil Resources (WRB) defines "sapric" (sa) as a histosol having less than one-sixth (by volume) of the organic material consisting of recognizable plant tissue within 100 cm of the soil surface. [4]
A soil family category is a group of soils within a subgroup and describes the physical and chemical properties which affect the response of soil to agricultural management and engineering applications. The principal characteristics used to differentiate soil families include texture, mineralogy, pH, permeability, structure, consistency, the ...
This soils usually contain high organic matter content, exceeding 75% with dry low bulk density around 0.2 mg/m 3 (0.0 gr/cu ft). [ 4 ] Areas of tropical peat are found mostly in South America (about 46% by area) [ 5 ] although they are also found in Africa, Central America, Asia and elsewhere around the tropics.
The following other wikis use this file: Usage on be.wikipedia.org Балотныя глебы; Usage on ca.wikipedia.org Histosòl; Usage on da.wikipedia.org
The concentration of SOM in soils generally ranges from 1% to 6% of the total mass of topsoil for most upland soils. Soils whose upper horizons consist of less than 1% of organic matter are mainly limited to deserts , while the SOM content of soils in low-lying, wet areas can be as great as 90%.
Most fossil soils, before the development of terrestrial vegetation in the Silurian, are entisols that show no distinct soil horizons. Entisols are common in the paleopedological record ever since the Silurian; however, unlike other soil orders ( oxisol , ultisol , gelisol , etc) they do not have value as indicators of climate.
The USDA soil taxonomy [16] and the Chinese soil taxonomy [17] call these soils Spodosols. [18] The Canadian system of soil classification matches Podzols with soils under the Podzolic order (e.g. Humo-Ferric Podzol). [19] [20] The Australian Soil Classification [21] uses the term Podosols. The Brazilian Soil Classification System [22] calls ...