Because they are generally quite young, Andisols typically are very fertile except in cases where phosphorus is easily fixed (this sometimes occurs in the tropics). They can usually support intensive cropping, with areas used for wet rice in Java supporting some of the densest populations in the world. Other Andisol areas support crops of fruit, maize, tea, coffee or tobacco. In the Pacific Northwest USA, Andisols support very productive forests.
Fossil Andisols are known from areas far from present-day volcanic activity and have in some cases been dated as far back as the Mesoproterozoic 1.5 billion years ago.[3][4]
Subordersedit
Aquands – Andisols with a water table at or near the surface for much of the year.
Gelands – Andisols of very cold climates (mean annual temperature <0 °C).
Cryands – Andisols of cold climates.
Torrands – Andisols of very dry climates.
Ustands – Andisols of semiarid and sub humid climates.
Udands – Andisols of humid climates.
Xerands – Temperate andisols with very dry summers and moist winters.
Vitrands – Relatively young andisols that are coarse-textured and dominated by glass.
^IUSS Working Group WRB (2015). "World Reference Base for Soil Resources 2014, Update 2015" (PDF). World Soil Resources Reports 106, FAO, Rome.
^Grunwald, Sabine. . Soil & Water Sciences. University of Florida. Archived from the original on 2006-09-16. Retrieved 2006-05-14.
^. Soil and Land Sciences Division. University of Idaho. Archived from the original on 2009-03-09. Retrieved 2006-05-14.
January 11, 2024
andisol, usda, soil, taxonomy, soils, formed, volcanic, defined, soils, containing, high, proportions, glass, amorphous, colloidal, materials, including, allophane, imogolite, ferrihydrite, world, reference, base, soil, resources, known, andosols, andosolan, p. In USDA soil taxonomy Andisols are soils formed in volcanic ash and defined as soils containing high proportions of glass and amorphous colloidal materials including allophane imogolite and ferrihydrite 1 In the World Reference Base for Soil Resources WRB Andisols are known as Andosols 2 AndisolAndosolan Andisol profileUsed inUSDA soil taxonomy World Reference Base for Soil ResourcesProfileABwCParent materialtephraBecause they are generally quite young Andisols typically are very fertile except in cases where phosphorus is easily fixed this sometimes occurs in the tropics They can usually support intensive cropping with areas used for wet rice in Java supporting some of the densest populations in the world Other Andisol areas support crops of fruit maize tea coffee or tobacco In the Pacific Northwest USA Andisols support very productive forests Andisols occupy about 1 of the global ice free land area Most occur around the Pacific Ring of Fire with the largest areas found in central Chile Ecuador Colombia Mexico the Pacific Northwest US Japan Java and New Zealand s North Island Other areas occur in the Great Rift Valley Kenya Italy Iceland and Hawaiʻi Fossil Andisols are known from areas far from present day volcanic activity and have in some cases been dated as far back as the Mesoproterozoic 1 5 billion years ago 3 4 Suborders editAquands Andisols with a water table at or near the surface for much of the year Gelands Andisols of very cold climates mean annual temperature lt 0 C Cryands Andisols of cold climates Torrands Andisols of very dry climates Ustands Andisols of semiarid and sub humid climates Udands Andisols of humid climates Xerands Temperate andisols with very dry summers and moist winters Vitrands Relatively young andisols that are coarse textured and dominated by glass See also editPedogenesis Pedology soil study Soil classificationReferences edit Andisols National Resource Conservation Service United States Department of Agriculture Archived from the original on 2006 05 09 Retrieved 2006 05 14 IUSS Working Group WRB 2015 World Reference Base for Soil Resources 2014 Update 2015 PDF World Soil Resources Reports 106 FAO Rome Grunwald Sabine Andisols Soil amp Water Sciences University of Florida Archived from the original on 2006 09 16 Retrieved 2006 05 14 Andisols Soil and Land Sciences Division University of Idaho Archived from the original on 2009 03 09 Retrieved 2006 05 14 Retrieved from https en wikipedia org w index php title Andisol amp oldid 1190036983, wikipedia, wiki, book, books, library,
