Mollisol
Mollisol | |
---|---|
Used in | USDA soil taxonomy |
Parent material | Loess, Limestone |
Climate | Humid continental, semi-arid |
Mollisol is a
Mollisols typically occur in savannahs and mountain valleys (such as Central Asia, and the North American
Though most other soil orders known today were formed at the beginning of the Carboniferous Ice Age 280 million years ago, Mollisols are best known from the paleopedological record as early as the Eocene. Their development is very closely associated with cooling and drying of the global climate that occurred during the Oligocene, Miocene and Pliocene.
Suborders
- Albolls—wet soils; aquic soil moisture regime with an eluvial horizon
- Aquolls—wet soils; aquic soil moisture regime
- Cryolls—cold climate; frigid or cryic soil temperature regime
- Gelolls—very cold climate; mean annual soil temperature < 0 °C
- Rendolls—lime parent material
- Udolls—humid climate; udic moisture regime
- Ustolls—subhumid climate; ustic moisture regime
- Xerolls—Mediterranean climate; xeric moisture regime
Soils which are mostly similar to Mollisols but contain either continuous or discontinuous
Other soils which have a mollic epipedon are classified as
In the World Reference Base for Soil Resources (WRB), Mollisols are split up into Chernozems, Kastanozems and Phaeozems. Shallow or gravelly Mollisols may belong to the Leptosols. Many Aquolls are Gleysols, Stagnosols or Planosols. Mollisols with a natric horizon belong to the Solonetz.[1]
See also
- Pedogenesis
- Pedology (soil study)
- Soil classification
- Soil science
- Soil type
References
- ^ IUSS Working Group WRB (2015). "World Reference Base for Soil Resources 2014, Update 2015" (PDF). World Soil Resources Reports 106, FAO, Rome.
- Brady, N.C. and Weil, R.R. (1996). ‘The Nature and Properties of Soils.’ 11th edition. (Prentice Hall, New Jersey).
- Buol, S.W., Southard, R.J., Graham, R.C., and McDaniel, P.A. (2003). ‘Soil Genesis and Classification.’ 5th edition. (Iowa State University Press - Blackwell, Ames.)
External links
- "Mollisols". USDA-NRCS. Archived from the original on 2006-05-09. Retrieved 2006-05-14.
- "Mollisols". University of Florida. Archived from the original on April 4, 2006. Retrieved 2006-05-14.
- "Mollisols". University of Idaho. Archived from the original on 2006-05-15. Retrieved 2006-05-14.