Lecture 5a Soil Taxonomy Purpose of Soil Taxonomy: 1. Organize knowledge about soils 2. Understand...
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Transcript of Lecture 5a Soil Taxonomy Purpose of Soil Taxonomy: 1. Organize knowledge about soils 2. Understand...
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Lecture 5aSoil Taxonomy Purpose of Soil Taxonomy: 1. Organize knowledge about soils 2. Understand relationships among different
soils 3. Establish groups or classes for practical
purposes. a. predicting behavior b. identifying best uses c. estimating productivity d. extending research results
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Soil Taxonomy- 12 Soil Orders
Soils are classified into into six categories based on diagnostic characteristics
The last (largest) category will place the soils into one of the 12 Soil Orders.
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Soil Taxonomy
1) Orders (12)2) Suborders (54)3) Great Groups (211)4) Subgroups (1,100+)5) Family (7,000+)6) Series (a lot!)
Fine-loamy mixed, superactive, mesic Aquic Argiudolls(This is the name of a specific soil in Soil Taxonomy)
This is the name of oneOf the 12 large categories
Mollisol - oll
Oder - root of order
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Orders
Highest and most general of the soil classification system (similar to the phylum in plant taxonomy)
Based on conditions under which the soil developed
Fine-loamy mixed, superactive, mesic Aquic Argiudolls
Orderoll = Mollisols
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Suborders
Grouped by similarities in soil formation such as wetter/dryer soil, colder/warmer soil, etc.
Fine-loamy mixed, superactive, mesic Aquic Argiudolls
SubOrder
Order
Ud = Udic Moisture
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Great Groups (not required to know)
Based on differences between soil horizons
Fine-loamy mixed, superactive, mesic Aquic Argiudolls
GreatGroup
SubOrder
Order
Argi = Clay accumulation
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Sub Groups (not required to know)
Describes a profile characteristic, wetness, sand, tonguing of E, etc.
GreatGroup
Fine-loamy mixed, superactive, mesic Aquic Argiudolls
SubGroup
SubOrder
Order
Aquic = wet soil
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Family (not required to know)
Based on soil properties that affect management and root penetration, such as texture, temperature, and depth
GreatGroup
Fine-loamy, mixed, superactive, mesic Aquic Argiudolls
FamilySubGroup
SubOrder
OrderTexture, clay minerals, CEC, temp,
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Series = Le Sueur – this is where the soils of the week names are from – ie Lester, Clarion, Nashwauk
etc.
Named from the town or landscape feature near where the soil was first recognized (Lester = Lester Prairie, MN. Other examples = Clarion, Nashwauk, Milaca, Port Byron, Zimmerman. Le Sueur for Le Sueur County, MN.)
GreatGroup
Fine-loamy mixed, superactive, mesic Aquic Argiudolls
FamilySubGroup
SubOrder
Order
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Diagnostics Horizons- Used to place soils into one of the 12 Soil Orders
Surface (Epipedon)
Mollic Umbric Histic Ochric
Subsurface• Argillic• Natric• Spodic• Oxic• Cambic• None
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Soil Taxonomy- Diagnostic Surface Epipedons
Mollic Epipedon - thick, dark, soft, surface layer.
Characteristics Thick - greater than 10
inches; High base saturation> 50%;
Mineral soil Soils formed under
prairie vegetation
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Other Epipedons Umbric - like
mollic, but low base saturation
Histic - Organic Soil - saturated with water, > -% organic matter
Ochric - thin, light colored - surface layers that do not fit any of the above
Base Saturation = relative amount of bases (Ca, Mg, K)in the soil,Low %= few, high% = many
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Comparison of Epipedons
Ochric Histic
Mollic
Umbric
thinner
lighter color
more organicmatter
low basesaturation
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Diagnostic Subsurface Horizons Argillic - illuvial
horizon of clay accumulation - Bt
Natric - same as argillic but with > 15% exchangeable sodium (Na) - Btn
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Diagnostic Subsurface Horizons
Spodic - illuvial accumulation of oxides of Al and Fe (sesquioxides) and OM, red or dark red color - only found in acid sandy soils, with high rainfall- generally found below E horizon. Contains a Bhs or Bs horizon or Bhsm
OiEBhsBs
C
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subsurface horizons (cont.)
Oxic - very weathered layer of only Fe and Al oxides and 1:1 clay minerals, low pH and not very fertile (found in tropical soils) Bo
Cambic - slightly altered layer - not weathered enough to be argillic, Bw horizon designation or development of color and or structure
NONE - no diagnostic subsurface horizon present
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Comparison of Subsurface Diagnostic Horizons
Oxic
very weathered
Spodic Cambic
Argillic
Natric
more Al and Fe
less developed
more sodium
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12 Soil Orders - Each Order has a diagnostic epipedon and subsurface horizons – which could be “none”.
WEB SITE for soil orders = www.mines.uidaho.edu/pses/teach_res
Entisol Inceptisol Andisols Spodosols Mollisols Alfisols Ultisols Oxisols Aridisols Vertisols Histosols Gelisols
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Entisol - ent
Recent soils - minimal development, little horizonation, young soils.
12.5% of world, Ochric + none
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Entisol - Idaho
A
R
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Vertisol - ert
Inverted - soils with high clay content,
Large shrink swell potential - gradually invert on themselves, 2.1% of the world,
Mollic or Ochric + none
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Vertisol = Bss at slickenslide
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Inceptisol - ept
Inception - soil shows the beginning of horizon development, little or no illuviation,
15.8% of world, Ochric or Umbric + cambic.
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Inceptisol
Soil Formed in colluvial material in mountains of Idaho.
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Aridisols - id
Arid regions of the world (19%), < 10 in. of rainfall, usually contain carbonates,
Ochric + cambic or argillic or other diagnostic feature.
A
Bw
Bk
C
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Aridisol in Idaho
ABt
BkBkqm
R
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Aridisol - Nevada
AzBzC1
C2
NaCl Salt accumulates on the surface and in the subsurface.
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Mollisols - oll
soils with thick, dark, soft surface - mollic + cambic, natric, argillic or none - high base saturation - soils of the prairie
9% of the world
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Mollisol This mollisol formed in a new
parent material (loess) that buried the original soil -the Btb (b = buried).
Mollisol from Kansas that is developed in Limestone bedrock.
A1A2BwBCR
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Spodosols- od
acid sandy soils with thick E and red Bhs - ochric and spodic -
5.4 % of the world - infertile soils.
OiE
Bhs
Bs
C
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Alfisol -- alf
fertile forested soils with ochric and argillic - high base saturation (> 35%) - forested soils
7% of the world.
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Ultisols - ult
soils more weathered than Alfisols - ochric and argillic - low base saturation < 35% - redder and more acid than Alfisols
8.5% of the world - less fertile than Alfisols
AE
Bt1
Bt2
BC
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Alfisol & Ultisol
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Histosols - ist
peat soils - organic material - histic
0.8% of the world Histic Epipedon.
Oe1
Oe2
Oe3
Oe4
Oa2C
Photo USDA
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Dyad
Describe the Soil Order that is most likely found in your home town.
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Andisols - and
soils from volcanic ash - very light - low bulk density –
1% or the world
Andisol from Idaho
A
Bw
2BC
2C
ABwAbBwb
Ab’
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Oxisols - ox
Soils with Oxic horizon - very weathered - soils of the tropics. low pH - acid soils - high in 1:1 clay minerals
9.2% of world
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OxisolAp1
Ap2
Bo1
Bo2
Bo3
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Oxisol Puerto Rico
ApABo1
Bo2
BC
C
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Gelisol - el
New Order as of 1998 - soils with permafrost (formerly Cryochrepts - or frozen Inceptisols)
Cf - horizon
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Soil Orders USA
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Soil Orders in Minnesota
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Soil Orders – Wisconsin & Northern Illinois
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Soil Suborders of Minnesota Mollisol - Udoll - Boroll - Aquoll - Ustoll Alfisol - Udalf - Boralf - Aqualf Dropped in 1998 Entisol - Orthent - Psamment – Aquent
- Fluvent Inceptisol - Udept - Aquept Spodosol - Orthod Vertisol - Aquert Histosol - Fibrist - Hemist - Saprist
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Suborder definitions Ud - Udic moisture = moist -southern Mn
type climate & Us = Ustic = Dry Bor - Boreas = northern Mn. Climate
(Frigid Temperature regime) Aqu - Aquic moisture = saturated soil -
high water table - Gleyed conditions Orth - true or simple - regular Entisols &
Spodosols Psamm - sand - sandy Entisols Fluv - floodplain –irregular Organic matter
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Udoll - Ustoll - Aquoll
Ustoll
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Udalf - Boralf - Aqualf
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Orthent - Psamment – Aquent - Fluvent
A
Bw
C
Orthent
Not Cambic due to being too sandy
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Fluvent – Soils of the floodplains.
Lots of layers that are deposited when the river floods
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OrthodWisconsin Orthod
A
E
Bhs
Bs
C
Minnesota Orthod
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Udept - Aquept
EUTRUDEPTS
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Aquert
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Fibrist - Hemist - Saprist
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Suborder Map
You need to know the location of the suborders in Minnesota
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