Udivitrand, Alfic
A representative soil profile of an Alfic Udivitrand from Idaho. (Photo provided by P. McDaniel.)
Alfic Udivitrands are like Typic Udivitrands, but they have an argillic or kandic horizon that has both an upper boundary within 125 cm either of the mineral soil surface or of the top of an organic layer with andic soil properties, whichever is shallower, and a base saturation (by sum of cations) of 35 percent or more in some part of the upper 50 cm or in the entire horizon if it is less than 50 cm thick. These soils are moderately extensive in Idaho and Oregon. They commonly support coniferous forest vegetation. Most of the soils are used for timber production, but some have been cleared and are used as cropland.
Udivitrands are the more or less well drained Vitrands that have a udic moisture regime. Characteristically, these soils have an ochric epipedon and a cambic horizon. Some have an argillic horizon. Most of the Udivitrands in the United States developed in Holocene deposits under coniferous forest vegetation.
Vitrands are the more or less well drained, coarse textured Andisols. These are relatively young soils that occur mostly near volcanoes. Most of the Vitrands in the United States are in Oregon, Washington, and Idaho. Vitrands formed mainly under coniferous forest vegetation. Characteristically, Vitrands have an ochric or mollic epipedon and a cambic horizon. Most of the Vitrands in the United States developed in Holocene deposits.
For more information about soils and the Michigan State University-Department of Geography, visit:
project.geo.msu.edu/soilprofiles/
For additional information about soil classification, visit:
www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...
Udivitrand, Alfic
A representative soil profile of an Alfic Udivitrand from Idaho. (Photo provided by P. McDaniel.)
Alfic Udivitrands are like Typic Udivitrands, but they have an argillic or kandic horizon that has both an upper boundary within 125 cm either of the mineral soil surface or of the top of an organic layer with andic soil properties, whichever is shallower, and a base saturation (by sum of cations) of 35 percent or more in some part of the upper 50 cm or in the entire horizon if it is less than 50 cm thick. These soils are moderately extensive in Idaho and Oregon. They commonly support coniferous forest vegetation. Most of the soils are used for timber production, but some have been cleared and are used as cropland.
Udivitrands are the more or less well drained Vitrands that have a udic moisture regime. Characteristically, these soils have an ochric epipedon and a cambic horizon. Some have an argillic horizon. Most of the Udivitrands in the United States developed in Holocene deposits under coniferous forest vegetation.
Vitrands are the more or less well drained, coarse textured Andisols. These are relatively young soils that occur mostly near volcanoes. Most of the Vitrands in the United States are in Oregon, Washington, and Idaho. Vitrands formed mainly under coniferous forest vegetation. Characteristically, Vitrands have an ochric or mollic epipedon and a cambic horizon. Most of the Vitrands in the United States developed in Holocene deposits.
For more information about soils and the Michigan State University-Department of Geography, visit:
project.geo.msu.edu/soilprofiles/
For additional information about soil classification, visit:
www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...