Haplocryand IS
Typic Haplocryand medial, amorphic), Iceland — This deep Andisol profile (Thingvallasveit soil) has formed in volcanic ash and eolian material in southwestern Iceland. The soil lacks distinct horizonation. Soil structure is weak and the volcanic ash particles are mostly silt- and sand-sized, making these soils highly susceptible to wind erosion. However as is the case with many Andisols, organic matter levels are relatively high — the top 60 cm of this profile contains 70-80 g/kg organic carbon. (Image from University of Idaho) (Notes and photo downloaded from: www.uidaho.edu/cals/soil-orders/andisols)
Haplocryands are the Cryands that do not have a melanic epipedon or a layer that meets the depth, thickness, and organic-carbon requirements for a melanic epipedon. They have, on undried samples, a 1500 kPa water retention of less than 100 percent, by weighted average, throughout 60 percent or more of the upper 60 cm of the andic materials. They also have a 1500 kPa water retention of 30 percent or more on undried samples or of 15 percent or more on air-dried samples, by weighted average, throughout 60 percent or more of the upper 60 cm of the andic materials. Characteristically, Haplocryands have a thin O horizon, an umbric epipedon, and a cambic horizon. The Haplocryands in the United States generally developed in late-Pleistocene or Holocene deposits. Most formed under coniferous forest vegetation.
Cryands are the more or less well drained Andisols of cold regions. These soils are moderately extensive. They formed in the western part of North America and the northeastern part of Asia above 49o north latitude and in mountains south of that latitude. Most of the soils formed under coniferous forest vegetation. Characteristically, Cryands have a thin O horizon and a cambic horizon. The epipedon ranges from ochric to melanic. The Cryands in the United States generally developed in late-Pleistocene or Holocene deposits.
For additional information about U.S. Soil Taxonomy, visit:
www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...
Haplocryand IS
Typic Haplocryand medial, amorphic), Iceland — This deep Andisol profile (Thingvallasveit soil) has formed in volcanic ash and eolian material in southwestern Iceland. The soil lacks distinct horizonation. Soil structure is weak and the volcanic ash particles are mostly silt- and sand-sized, making these soils highly susceptible to wind erosion. However as is the case with many Andisols, organic matter levels are relatively high — the top 60 cm of this profile contains 70-80 g/kg organic carbon. (Image from University of Idaho) (Notes and photo downloaded from: www.uidaho.edu/cals/soil-orders/andisols)
Haplocryands are the Cryands that do not have a melanic epipedon or a layer that meets the depth, thickness, and organic-carbon requirements for a melanic epipedon. They have, on undried samples, a 1500 kPa water retention of less than 100 percent, by weighted average, throughout 60 percent or more of the upper 60 cm of the andic materials. They also have a 1500 kPa water retention of 30 percent or more on undried samples or of 15 percent or more on air-dried samples, by weighted average, throughout 60 percent or more of the upper 60 cm of the andic materials. Characteristically, Haplocryands have a thin O horizon, an umbric epipedon, and a cambic horizon. The Haplocryands in the United States generally developed in late-Pleistocene or Holocene deposits. Most formed under coniferous forest vegetation.
Cryands are the more or less well drained Andisols of cold regions. These soils are moderately extensive. They formed in the western part of North America and the northeastern part of Asia above 49o north latitude and in mountains south of that latitude. Most of the soils formed under coniferous forest vegetation. Characteristically, Cryands have a thin O horizon and a cambic horizon. The epipedon ranges from ochric to melanic. The Cryands in the United States generally developed in late-Pleistocene or Holocene deposits.
For additional information about U.S. Soil Taxonomy, visit:
www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...