Fulvudand
A soil profile of a Fulvudand in Washington State. This soil formed in material weathered from basalt bedrock with an admixture of volcanic ash in roughly the upper 50 cm. This profile has an umbric epipedon extending from the surface to a depth of about 25 cm. Below this epipedon is a cambic horizon that extends to about 120 cm. The left side of the profile exhibits natural soil structure; the right side of the profile has been smoothed. (Soil Survey Staff. 2015. Illustrated guide to Soil Taxonomy. U.S. Department of Agriculture, Natural Resources Conservation Service, National Soil Survey Center, Lincoln, Nebraska)
Fulvudands have a surface layer that meets the depth, thickness, and organic-carbon requirements for a melanic epipedon but is lighter in color. Characteristically, Fulvudands have a thin O horizon, an umbric (humus-rich with low base saturation) epipedon, and a cambic (minimal soil development) subsoil horizon. The Fulvudands in the United States generally developed in late-Pleistocene deposits. Most formed under coniferous forest vegetation.
For additional information about soil classification, visit:
www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...
Fulvudand
A soil profile of a Fulvudand in Washington State. This soil formed in material weathered from basalt bedrock with an admixture of volcanic ash in roughly the upper 50 cm. This profile has an umbric epipedon extending from the surface to a depth of about 25 cm. Below this epipedon is a cambic horizon that extends to about 120 cm. The left side of the profile exhibits natural soil structure; the right side of the profile has been smoothed. (Soil Survey Staff. 2015. Illustrated guide to Soil Taxonomy. U.S. Department of Agriculture, Natural Resources Conservation Service, National Soil Survey Center, Lincoln, Nebraska)
Fulvudands have a surface layer that meets the depth, thickness, and organic-carbon requirements for a melanic epipedon but is lighter in color. Characteristically, Fulvudands have a thin O horizon, an umbric (humus-rich with low base saturation) epipedon, and a cambic (minimal soil development) subsoil horizon. The Fulvudands in the United States generally developed in late-Pleistocene deposits. Most formed under coniferous forest vegetation.
For additional information about soil classification, visit:
www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...