Soil Orders Flashcards Preview

PLS 366 > Soil Orders > Flashcards

Flashcards in Soil Orders Deck (45):
1

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

Entisols (ent)

2

immature, ochric, no Bt, resistant parent material

Inceptisols (ept)

3

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

Andisols (and)

4

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

Aridisols (id)

5

frozen, permafrost, little development

Gelisols (el)

6

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

Vertisols (ert)

7

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

Mollisols (oll)

8

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

Alfisols (alf)

9

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

Ultisols (ult)

10

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

Spodosols (od)

11

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

Oxisols (ox)

12

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

Histosols (ist)

13

ent

Entisols

14

ept

Inceptisols

15

and

Andisols

16

el

Gelisols

17

id

Aridisols

18

ert

Vertisols

19

oll

Mollisols

20

alf

Alfisol

21

ult

Ultisols

22

od

Spodosols

23

ox

Oxisols

24

ist

Histosols

25

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

Aquic

26

moisture regime - humid climate, no water constraints

Udic

27

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

Ustic

28

moisture regime - dry, desert, very limited growing season

Aridic

29

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

Xeric

30

temperature regime - < 8 degrees C, cool summer

Cryic

31

temperature regime - > 8 degrees C, warmer in summer

Frigid

32

temperature regime - 10-15 degrees C

Mesic

33

temperature regime - 15-22 degrees C

Thermic

34

Entisols (ent)

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

35

Inceptisols (ept)

immature, ochric, no Bt, resistant parent material

36

Andisols (and)

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

37

Aridisols (id)

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

38

Gelisols (el)

frozen, permafrost, little development

39

Vertisols (ert)

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

40

Mollisols (oll)

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

41

Alfisols (alf)

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

42

Ultisols (ult)

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

43

Spodosols (od)

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

44

Oxisols (ox)

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

Histosols (ist)

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