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Soil Geography

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S=f(o, cl, r, p, t) o=organisms. cl=climate. r=relief. p ... mesic Lithic Xerorthent. http://soils.ag.uidaho.edu/soilorders. The Mollisol Order. mollis, soft ... – PowerPoint PPT presentation

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Title: Soil Geography


1
Soil Geography
  • Sources
  • http//soils.ag.uidaho.edu/soilorders
  • http//www.geo.wvu.edu/kite/2002SoilsHandout.htm

2
Theoretical Model of Soil
  • The Jenny equation (1941)
  • Sf(o, cl, r, p, t)
  • oorganisms
  • clclimate
  • rrelief
  • pparent material
  • ttime

3
Soil Textures
4
Texture Families
5
Entisol Order
  • recent
  • Soils of recent origin
  • Floodplains
  • Steep, rocky
  • Having only an A horizon

6
Entisol Suborders
7
  • loamy-skeletal, mixed,
  • superactive, nonacid,
  • mesic Lithic Xerorthent
  • http//soils.ag.uidaho.edu/soilorders

8
The Mollisol Order
  • mollis, soft
  • Formed under influence of grassland.
  • Insufficient precipitation to leach the soil.
  • Long-term addition of organic materials from
    plant roots.
  • Deep, dark colored surface horizon.
  • Fertile soils.

9
Palouse Series Haploxeroll
A AB BW1 BW2
10
Mollisols in the U.S.
11
Mollisol Suborders
12
Cryoll Landscape
13
  • fine-loamy, mixed,
  • superactive
  • Pachic Argicryoll
  • http//soils.ag.uidaho.edu/soilorders

14
Argixeroll Landscape
15
  • loamy-skeletal, mixed,
  • superactive, mesic
  • Lithic Argixeroll
  • http//soils.ag.uidaho.edu/soilorders

16
Alfisol Order
  • Moderately leached forest soils.
  • Clay accumulation in subsurface horizon.
  • Fertile soils.

17
Alfisol Landscape
18
  • fine-loamy, mixed,
  • superactive
  • Typic Haplocryalf
  • http//soils.ag.uidaho.edu/soilorders

19
Spodosol Order
  • od, spodos, wood ashes.
  • Acid soils with subsurface accumulation of humus
    and Al Fe oxides.
  • Highly leached E horizon.

20
Spodosol Landscape
  • http//soils.ag.uidaho.edu/soilorders

21
  • medial over loamy,
  • Andic Haplocryod
  • http//soils.ag.uidaho.edu/soilorders

22
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23
Inceptisol Order
  • ept, inceptum, beginning
  • Minimal horizon development.
  • Steep slopes, young geomorphic surfaces,
    resistant parent materials.

24
Inceptisol Suborders
25
Inceptisol Landscape
26
  • loamy-skeletal, mixed,
  • active
  • Xeric Dystrocryept
  • http//soils.ag.uidaho.edu/soilorders

27
  • loamy-skeletal, mixed,
  • superactive
  • Humic Eutrocryept
  • http//soils.ag.uidaho.edu/soilorders

28
Andisol Order
  • Primarily soils formed in volcanic ash.
  • Dominated by glass and weathering products of
    glass.
  • High water-holding capacity.
  • Will fix large quantities of phosphorus.

29
Andisol Suborders
30
Volcanic Glass
31
  • ashy over sandy-skeletal
  • frigid
  • Typic Vitrixerand
  • http//soils.ag.uidaho.edu/soilorders

32
Histosol Order
  • ist, histos, tissue
  • Mainly organic materials
  • Restricted drainage to inhibit decomposition of
    plant materials
  • High carbon, wetlands

33
Haplosaprist Landscape
34
  • euic, frigid
  • Typic Haplosaprist
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