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

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Presentation transcript:

Aridic Haploxerert Ap Bss2 BC C Bss1 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 Ap Bss2 BC C Bss1 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.

Aridic Haploxerert Ap Bss2 BC C Bss1 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.

Aridic Haploxerert Ap Bss2 BC C Bss1 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?

Wedge-shaped peds Slickensides

Aridic Haploxerert Ap Bss2 BC C Bss1 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 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?

TYPIC CALCIUDOLLS Ap A BA Bk C 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 A BC Bs Bhs E 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

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

Calcic Haploxerept A BA Bk1 2Bk2 2C Bw 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 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