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Transcript

  • 1.
    • Rachael Kiowski
    • Grace Lawson
    • Amber Stacy
  • 2.
    • Entisols are defined as soils that do not show any profile development other than an A horizon
    • Have no diagnostic horizons, and most are basically unaltered from their parent material, which can be unconsolidated sediment or rock
    • Are the 2nd most abundant soil order (after Inceptisols), occupying ~16% of the global ice-free land area
  • 3.
    • Resistant or unweatherable parent materials - sand, iron oxide, aluminum oxide, kaolinite clay
    • Erosion - common on shoulder slopes; other kinds also important
    • Deposition - continuous, repeated deposition of new parent materials by water, wind, colluvium, mudflows, other means
  • 4.
    • Cool climate - not cold enough in winter for permafrost
    • Dry climate
    • Flooding or saturation
    • Shallow depth to bedrock - rock may be resistant to weathering, such as quartzite or ironstone
    • Toxic parent materials - serpentine soil, mine soils, sulfidic clays
  • 5.  
  • 6.  
  • 7.  
  • 8.
    • Aquents
      • Widely distributed
      • Known as the ‘Wet Entisols’
      • Supports vegetation that tolerates periodic to permanent wetness
      • Poor drainage
  • 9.
    • Arents
      • Do not have distinct horizons due to plowing
      • Important irrigation crop production soils in California
      • Mostly used for crops, urban land, & pastures
      • Some are used as wildlife habitats
  • 10.
    • Fluvents
      • Free draining Entisols in recent water-deposited sediments on flood plains, fans, & deltas along rivers & streams
      • Stratification common
  • 11.
    • Fluvents, continued…
      • Most are frequently flooded unless protected by dams or levees
      • Largest areas occur in flood plains along the Mississippi River
      • Most used as rangeland, forests, pastures, & wildlife habitat
      • Some can be used as cropland
  • 12.
    • Orthents
      • Mainly present in the Western States
      • Commonly on recently eroded surfaces
      • Shallow depth
      • Mostly used for rangeland, pastures & wildlife habitat
  • 13.
    • Psamments
      • Widely distributed
      • Sandy in all layers
      • Among most productive rangeland in arid & semiarid climates
      • Some can be nearly bare due to erosion
      • Provides poor support for vehicles
  • 14.
    • Common landscapes include
      • flood plains of rivers & streams
      • sand dunes
      • steep mountains
      • mined
      • other disturbed lands
    • Can also be found on older more stable landscapes
  • 15.
    • Entisols often have use limitations & can be easily degraded due to:
      • flooding
      • steep slopes
      • arid conditions
    • Entisols along river floodplains are often intensively farmed & are some of the most agriculturally productive soils in the world
  • 16.
    • Entisols are the most abundant soil order.
    • Entisols are defined as?
    • What are 3 causes of delayed or absent development?
    • What are the 5 main suborders of Entisols?
    • Entisols are what percentage of global ice-free land area?
  • 17.
    • Brady, Nyle C.; Ray R. Weil. The Nature & Properties of Soils. Chapter 3. Section 3.5 Entisols (Recent: Little if Any Profile Development). Pgs 90-92.
    • USDA Natural Resources Conservation Service
      • http://soils.usda.gov/technical/classification/orders/entisols.html
      • http://soils.usda.gov/technical/classification/or ders/entisols_map.html