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Aridic Haploxerert

Ap. Bss1. Bss2. BC. C. Aridic Haploxerert. List key properties Order , Suborder , Great group , Subgroup Which diagnostic horizons and key criteria did you identify? Epipedon , Diagnostic subsurface horizons , Other characteristics

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Aridic Haploxerert

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  1. Ap Bss1 Bss2 BC C Aridic Haploxerert List key properties • Order, Suborder, Great group, Subgroup Which diagnostic horizons and key criteria did you identify? • Epipedon, Diagnostic subsurface horizons, Other characteristics Customize soil properties that demonstrate the diagnostic criteria Soil Forming Processes

  2. Ap Bss1 Bss2 BC C Aridic Haploxerert • List key properties • Vertisols: (p. 33) • High clay content (> 30% in Ap and to 50 cm) • Within 100 cm: slickensides/wedge-shaped peds 25 cm thick layer • Cracks that open and close periodically. • Xerert: (p. 287) • Frigid, mesic, or thermic temp. regime • Moisture regime inferred from temporal pattern of cracking (because control section concept does not work in these cracking soils). • Open > 60 days consecutive in summer • Closed > 60 consecutive in winter. • Haploxerert: (p. 297) • Minimum horizon development. • No duripan, calcic, or petrocalcic horizon within 100 cm of mineral soil surface. • Aridic Haploxerert: (p. 298) • No bedrock or salts. • Cracks: Open > 180 days consecutive.

  3. Ap Bss1 Bss2 BC C Aridic Haploxerert • Diagnostic horizons and features • Epipedon – none required, but can be mollic or ochric. • Subsurface – none required, but cambic and calcic horizons are common. • Other –Slickensides and/or wedge-shaped peds produced by shrink-swell processes.

  4. Ap Bss1 Bss2 BC C Aridic Haploxerert • Soil forming processes dominated by: • Shrink-swell churning, which limits the expression of horizons • Low leaching, high base environment favors production and accumulation of smectite minerals such as montmorillonite • Additions • Organic debris to surface and into cracks. • Removals • Minimal due to low leaching (climate and low Ksat). • Transfers • Cracks & churning redistribute material from surface. • Transformations • Production of smectite minerals?

  5. Slickensides Wedge-shaped peds

  6. Ap Bss1 Bss2 BC C List key properties • Order, Suborder, Great group, Subgroup Which diagnostic horizons and key criteria did you identify? • Epipedon, Diagnostic subsurface horizons, Other characteristics Customize soil properties that demonstrate the diagnostic criteria Soil Forming Processes Aridic Haploxerert • Key Criteria • Vertisols: ( Key to Soil Orders on p. 33) • High clay content (> 30% in upper 18 cm or Ap horizon and to 50 cm) • Within 100 cm: slickensides or wedge-shaped peds in a layer 25 cm or more thick • Cracks that open and close periodically • Xerert: ( Key to Suborders of Vertisols on p. 287) • Frigid, mesic, or thermic soil temperature regime • Moisture regime inferred from temporal pattern of cracking (because control section concept does not work in these cracking soils) • Open > 60 days consecutive in summer • Closed > 60 consecutive in winter • Haploxerert: ( Key to Great Groups on p. 297) • Minimum horizon development • No duripan, calcic, or petrocalcic horizon within 100 cm of mineral soil surface • Aridic Haploxerert: ( Key to Subgroups on p. 298) • No hard bedrock, high salinity, or high sodium • Cracks: Open > 180 days consecutive • Diagnostic horizons and features • Epipedon – none required, but could be mollic or ochric • Subsurface – none required, but cambic and calcic are common • Slickensides and/or wedge-shaped peds produced by shrink-swell processes • Soil forming processes dominated by: • Shrink-swell churning, which limits the expression of horizons • Low leaching, high base environment favors production and accumulation of smectite minerals such as montmorillonite • Additions • Organic debris to surface and into cracks • Removals • Minimal due to low leaching (climate and low Ksat) • Transfers • cracks & churning redistribute material from surface • Transformations • production of smectite minerals?

  7. Ap A BA Bk BC C List key properties • Order, Suborder, Great group, Subgroup Which diagnostic horizons and key criteria did you identify? • Epipedon, Diagnostic subsurface horizons, Other characteristics Customize soil properties that demonstrate the diagnostic criteria Soil Forming Processes TYPIC CALCIUDOLLS

  8. A E Bhs Bs BC List key properties • Order, Suborder, Great group, Subgroup Which diagnostic horizons and key criteria did you identify? • Epipedon, Diagnostic subsurface horizons, Other characteristics Customize soil properties that demonstrate the diagnostic criteria Soil Forming Processes TYPIC HAPLOCRYODS

  9. Oxyaquic Udifluvent List key properties • Order, Suborder, Great group, Subgroup Which diagnostic horizons and key criteria did you identify? • Epipedon, Diagnostic subsurface horizons, Other characteristics Customize soil properties that demonstrate the diagnostic criteria Soil Forming Processes ^Au ^ABu 2^Cu 3^C 4Cg

  10. Calcic Haploxerept A BA Bw Bk1 2Bk2 2C List key properties • Order, Suborder, Great group, Subgroup Which diagnostic horizons and key criteria did you identify? • Epipedon, Diagnostic subsurface horizons, Other characteristics Customize soil properties that demonstrate the diagnostic criteria Soil Forming Processes

  11. A1 A2 E Bw Bt1 Bt2 Bt3 Bt4 List key properties • Order, Suborder, Great group, Subgroup Which diagnostic horizons and key criteria did you identify? • Epipedon, Diagnostic subsurface horizons, Other characteristics Customize soil properties that demonstrate the diagnostic criteria Soil Forming Processes TYPIC KANDIUDULTS

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