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PLS 366 > Soil Orders > Flashcards

Soil Orders Flashcards

1
Q

only A horizon over C, found on or within parent materials, poor climatic conditions, considered other soils

A

Entisols (ent)

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2
Q

immature, ochric, no Bt, resistant parent material

A

Inceptisols (ept)

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3
Q

young, high porosity, formed from volcanic ash, highly productive soils, wind and erosion problems, Melanic, low bulk density

A

Andisols (and)

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4
Q

short wet periods, little leaching of cations, low OM, salt accumulations

A

Aridisols (id)

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5
Q

frozen, permafrost, little development

A

Gelisols (el)

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6
Q

must have >30% expanding clays, high expansion and contraction, self mising, big cracks, deep A, poor horizonation

A

Vertisols (ert)

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7
Q

Mollic epipedon, >50% base saturation, very fertile and productive

A

Mollisols (oll)

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8
Q

ochric or umbric (acidic mollic), well developed A, (E) B, C, Bt, >35% base saturation, generally forested soils

A

Alfisols (alf)

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9
Q

ochric or umbric, Bt, well developed horizon hoizons, acidic,

A

Ultisols (ult)

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10
Q

high sand content, ochric, usually have E, Bhs or Bs, highly leaches, very acidic, low base saturation, very infertile, forested areas (sand +pine) = ?

A

Spodosols (od)

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11
Q

very highly weathered, tropicl, ochric or umbric, oxic subsurface horizons, low activity 1:1 clays, Fe and Al oxides, Bo, very low % base saturation

A

Oxisols (ox)

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12
Q

organic soil, histic, 12-18% organic matterial, saturated part of year, high water and nutrient holding capacity, low bulk density

A

Histosols (ist)

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13
Q

ent

A

Entisols

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14
Q

ept

A

Inceptisols

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15
Q

and

A

Andisols

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16
Q

el

A

Gelisols

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17
Q

id

A

Aridisols

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18
Q

ert

A

Vertisols

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19
Q

oll

A

Mollisols

20
Q

alf

A

Alfisol

21
Q

ult

A

Ultisols

22
Q

od

A

Spodosols

23
Q

ox

A

Oxisols

24
Q

ist

A

Histosols

25
Q

moisture regime - saturated w/ water for sufficient periods of the year

A

Aquic

26
Q

moisture regime - humid climate, no water constraints

A

Udic

27
Q

moisture regime - part of the growing season may be dry, plants might have problems finding water

A

Ustic

28
Q

moisture regime - dry, desert, very limited growing season

A

Aridic

29
Q

moisture regime - Mediterranean style, cool wet winter and dry hot summers

A

Xeric

30
Q

temperature regime - < 8 degrees C, cool summer

A

Cryic

31
Q

temperature regime - > 8 degrees C, warmer in summer

A

Frigid

32
Q

temperature regime - 10-15 degrees C

A

Mesic

33
Q

temperature regime - 15-22 degrees C

A

Thermic

34
Q

Entisols (ent)

A

only A horizon over C, found on or within parent materials, poor climatic conditions, considered other soils

35
Q

Inceptisols (ept)

A

immature, ochric, no Bt, resistant parent material

36
Q

Andisols (and)

A

young, high porosity, formed from volcanic ash, highly productive soils, wind and erosion problems, Melanic, low bulk density

37
Q

Aridisols (id)

A

short wet periods, little leaching of cations, low OM, salt accumulations

38
Q

Gelisols (el)

A

frozen, permafrost, little development

39
Q

Vertisols (ert)

A

must have >30% expanding clays, high expansion and contraction, self mising, big cracks, deep A, poor horizonation

40
Q

Mollisols (oll)

A

Mollic epipedon, >50% base saturation, very fertile and productive

41
Q

Alfisols (alf)

A

ochric or umbric (acidic mollic), well developed A, (E) B, C, Bt, >35% base saturation, generally forested soils

42
Q

Ultisols (ult)

A

ochric or umbric, Bt, well developed horizon hoizons, acidic,

43
Q

Spodosols (od)

A

high sand content, ochric, usually have E, Bhs or Bs, highly leaches, very acidic, low base saturation, very infertile, forested areas (sand +pine) = ?

44
Q

Oxisols (ox)

A

very highly weathered, tropicl, ochric or umbric, oxic subsurface horizons, low activity 1:1 clays, Fe and Al oxides, Bo, very low % base saturation

45
Q

Histosols (ist)

A

organic soil, histic, 12-18% organic matterial, saturated part of year, high water and nutrient holding capacity, low bulk density

PLS 366 (11 decks)

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