soil taxonomy and classification. order suborder great group sub group family series 12 19,000 soil...
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Soil Taxonomy and Classification
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Order
Suborder
Great group
Sub group
Family
Series
12
19,000
Soil Taxonomy HierarchySoil Taxonomy Hierarchy
63
250
1400
8000
KingdomPhylumClassOrder FamilyGenusSpecies
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Diagnostic Surface HorizonsDiagnostic Surface Horizons
Epipedons
MollicUmbricOchricHisticMelanicPlaggenAnthropic
Very common
Human-derived
“specialized”
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Vegetationestablished
O.M. accumulation
time
Organic Matter AccumulationOrganic Matter Accumulation
Histic
Mollic, Umbric
ochric
Parentmaterial
tmax = 3000 yrs
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Diagnostic Sub-surface Horizons
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Diagnostic SubsurfaceDiagnostic Subsurface HorizonsHorizons
Clays Organic Matter Oxides
FormationTranslocation
Transformation
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Organic Matter Clays Oxides
smectites
Subsurface HorizonsSubsurface Horizons
Kaolinite
Also: salts, carbonates, sulfides
Dark colorsMetals (Fe, Al)
IronAluminum
FormationTranslocation
Transformation
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Diagnostic Subsurface Diagnostic Subsurface HorizonsHorizons
AlbicArgillicSpodic OxicKandicCambicSombricsulfuric
NatricAgricCalcic GypsicSalicDuripanFragipanPlacic
Subordinate Distinctions
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Diagnostic Subsurface HorizonsDiagnostic Subsurface Horizons
Albic (white) Horizon
Light-colored (Value > 6 moist )Elluvial (E master horizon*)Low in clay, Fe and Al oxidesGenerally sandy texturedLow chemical reactivity (low CEC)Typically overlies Bh or Bt horizons
albic
*not all E horizons are albic horizons
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Argillic Horizon
Illuvial accumulation of silicate clays Illuvial based on overlying horizonClay bridgesClay coatings
Diagnostic Subsurface HorizonsDiagnostic Subsurface Horizons
Bt horizon
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Diagnostic Subsurface Clay HorizonsDiagnostic Subsurface Clay Horizons
Argillic Horizon Kandic Horizon
Activity of ClaysHigh Low
Illuviation of clayNecessary Not Necessary
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Diagnostic Subsurface HorizonsDiagnostic Subsurface Horizons
Spodic Horizon
Spodic
• Illuvial accumulation of organic matter and aluminum (+/- iron)• Dark colored (value, chroma < 3)• Low base saturation (acidic)• Formed under humid acid conditions
Bh horizon
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Elluviation (E horizon and A horizons)
Organic matter Clays
Spodic horizon
Bh horizon Bt horizon
Argillic horizon
Elluviation and IlluviationElluviation and Illuviation
A
E
Bh
A
Bt
E
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Diagnostic Subsurface HorizonsDiagnostic Subsurface Horizons
Oxic horizon
• Highly weathered (high temperatures, high rainfall)
- High in Fe, Al oxides- High in low-activity clays (kaolinite < smectite < vermiculite)
activity
Bo horizon
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Surface Horizons:Mollic- thick, dark colored, high %B.S., structureUmbric – same, but lower B.S.Ochric – pale, low O.M., thinHistic – High O.M., thick, wet, dark
Sub-Surface Horizons:Argillic – illuvial accum. of clay (high activity)Kandic – accum. of clay (low activity)Spodic – Illuvial O.M. accumulation (Al and/or Fe)Oxic – highly weathered, kaolinite, Fe and Al oxidesAlbic – light colored, elluvial, low reactivity
Diagnostic Horizons
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Soil TaxonomySoil Taxonomy
Diagnostic EpipedonsDiagnostic Subsurface horizons
Moisture RegimesTemperature Regimes
AgeTextureDepth
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Order
Suborder
Great group
Sub group
Family
Series
12
19,000
Soil OrdersSoil Orders
Soil forming processes, presence orAbsence of major diagnostic horizonsSimilar genesis
63
250
1400
8000
Grasslands – thick, dark epipedons
High %B.S.
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Soil OrdersSoil Orders
Entisols
Histosols Inceptisols Andisols Gelisols
Aridisols Vertisols
Alfisols Mollisols
Ultisols Spodosols
Oxisols
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Soil OrdersSoil Orders
Entisol HistosolInceptisol AlfisolUltisolSpodosolMollisol
OxisolAndisolGelisolAridisolVertisol
Ent- Hist- Incept- Alf- Ult-Spod-Moll-
Ox-And- Gel- Arid-Vert-
RecentHistic (organic)InceptionTelevision alienUltimate Spodos (wood ash)Mollis (soft)
oxideAndo (black)Gelid (cold)Arid (dry)Verto (turn)
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Soil Orders in FloridaSoil Orders in Florida
E
Bt
C
A
C
O
C
Bw
C
Bw
E
Bh
C
Bt
E
•Entisols – little development, usually A-C horizons, ochric epipedon •Inceptisols – A little more development, Bw horizons, ochric, umbric epipedon•Alfisols – Argillic/Kandic horizon (Bt) less than 2 m, base saturation is > 35%•Ultisols – Argillic/Kandic horizon (Bt) less than 2 m, base saturation is < 35%•Mollisols – Mollic epipedon, dark, high organic matter•Spodosols – Spodic horizon (Bh), ochric, umbric epipedon •Histosols – Organic soil, histic epipedon
0
2
A A AA
A
C
Entisols Inceptisols Alfisols Ultisols SpodosolsMollisols Histosols
met
ers
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EntisolsEntisolsYoung SoilsWeaklly developedSandy or clayeyOchric EpipedonA – C profiles
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Taxonomic Peculiarity
2 meters(200 cm)
A horizon
C horizon
Bt
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Entisols
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InceptisolsInceptisols
Little DevelopmentOchric, Histic, or Umbric epipedonOne or more subsurface horizonsWeakly developedContains many unweathered minerals
Bw horizon
Ap horizon
C horizon
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HistosolsHistosols• Peat or muck• > 20% organic matter• Agriculturally valuable• Sometimes used as fuel• Often over impermeable material
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Histosols
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Alfisols
A horizon
E horizon
Bt horizon (argillic, kandic) base saturation > 35%
Mollic/Umbric/Ochric epipedon
Btg horizon
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Ultisols
A horizon
E horizon
Bt horizon Mollic/umbric/Ochric epipedonArgillic or Kandic horizonBase saturation < 35%
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Ultisols and Alfisols
Mixed Hardwood Forests
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Spodosols
Associated with acidic vegetation
Subsoil accumulation of organic matterwith aluminum and/or iron
Formed under Wet acidic conditions
Poorly or Very poorly drained
Pine Flatwoods
State Soil of Florida
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Spodosols
Pine Flatwoods (wet, acidic)
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Mollisols
Mollic Epipedon
High organic matterThick surface horizonHighly productive
Many with argillicPoorly-drainedSurface % B.S. > 50%
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Mollisols
Grasslands
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Soil OrdersSoil Orders
Entisols
Histosols Inceptisols Andisols Gelisols
Aridisols Vertisols
Alfisols Mollisols
Ultisols Spodosols
Oxisols
slight
Strong
Weathering anddevelopment
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Geographic DistributionGeographic Distribution
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Spodosols 8.4 million acres
Entisols 7.5
Ultisols 6.9
Alfisols 4.6
Histisols 4.0
Inceptisols 1.0
Mollisols 1.0
Florida Soil Orders
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Order
Suborder
Great group
Sub group
Family
Series
12
19,000
Soil TaxonomySoil Taxonomy
Soil forming processes / diagnostic horizons
Genetic similarity: Wetness, climate, vegetation63
250
1400
8000
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Wet
Dry
Moisture ConditionsMoisture Conditions
Aquic – poor aeration, reduced ironUdic- dry < 90 total days
Ustic - limited but is present Aridic- moist <90 total daysXeric - dry
cold
Hot
Temperature ConditionsTemperature Conditions
Cryic – icy coldFrigid – lower than 8oCMesic – between 8 and 15oCThermic – between 15 and 22oCHyperthermic - > 22oC
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Suborder Examples
Suborders
Temperature, moisture, diagnostic horizons
Aquod very wet spodosolUdult wet ultisolUdoll wet mollisolXeroll dry mollisolOchreptUmbreptalboll
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Order
Suborder
Great group
Sub group
Family
Series
12
19,000
Soil TaxonomySoil Taxonomy
Soil forming processes / diagnostic horizons
Soil moisture conditions, diagnostic horizon
Arrangement of Diagnostic horizons
63
250
1400
8000
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Great Groups
Based on diagnostic horizonsand their arrangements orother features like age, color, texture
Arg - argillic horizon presentPale - oldKand - kandic horizon presentHapl - minimum horizonationquartzi – quartz sandHum - humid
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Suborder Great Group
Udult paleudult
Aquoll argiaquoll
Udalf paleudalf
Udult hapludult
Order
Ultisol
Mollisol
Alfisol
Ultisol
Greater Specificity
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Sub group
Expresses the core concept of the great group
Moisture, sandiness, depth, color
Typic hapludultGrossarenic quartzipsamment
Typic shallow sandArenic deeper sandGrossarenic deep sandAquic
ordersuborderGreatgroup
Subgroup
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Families
Properties important to growth of plant roots
Particle size mineralogy temperature oC
SandyLoamyFine loamyClayey
SiliceousKaoliniticSmectiticOxidic
Frigid < 8Mesic 8-15Thermic 15-22Hyperthermic > 22
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Series
Horizon number, order, thickness, texture, structure, Color, Organic matter, pH, accumulations
Mollisol Aquoll Argiaqoll typic Argiaquoll typic argiaquoll Brookston loamy siliceous Cordova
Westland
Order Sub-order G. Group Sub-group Family Series
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Apopka loamy, siliceous, hyperthermic grossarenic paleudult
Ledwith fine, smectitic, hyperthermic mollic albaqualf
Surrency loamy, siliceous, thermic, arenic paleaquult
Pomona sandy, siliceous, hyperthermic, ultic, haplaquod
paleudult
albaqualf
paleaquult
haplaquod
order Subordergreat groupsub-groupfamily
Alachua County
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paleudult
albaqualf
Great group suborder order
Alachua County
Great group suborder order