SOILTAXONOMY - Home | NRCS to Identify Hydric Soils. Soil Taxonomy is A basic system of soil...
Transcript of SOILTAXONOMY - Home | NRCS to Identify Hydric Soils. Soil Taxonomy is A basic system of soil...
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Using Using
SOILTAXONOMYSOILTAXONOMYto Identify Hydric Soilsto Identify Hydric Soils
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Soil Taxonomy is
A basic system of soil classification for making and interpreting soil surveys.
Objective: To develop a hierarchical classification
that reflects the relationships between different soils, and between soils and the factors responsible for their character.
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Soil Taxonomy
Procedure:Soils are classified on the basis of:zSoil properties observed in the field (e.g.,
soil horizons, texture, color, pH) andzSoil properties inferred from the
combined data of soil science and other disciplines (e.g., soil temperature and moisture regimes inferred from soil science and meteorology).
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Soil Taxonomy
Series
Family
Sub Group
Great Group
Sub OrderFirst sign of wetness
Order12 Orders
Entisol
Fluvent
Ustic
Fine-loamy, mixed, frigid
Korchea
Mollic
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Fine-loamy, mixed (calcareous), frigid, Mollic Ustifluvent
Korchea SeriesNot Hydric
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Soil Taxonomy
Nature ofNumber Differentiating
Category of Taxa Characteristics
Order 12 Soil-forming processesas indicated by presence orabsence of majordiagnostic horizons
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Soil Orders
zAlfisols
zAndisols
zAridisols
zEntisols
zGelisols
zHistosols
z Inceptisols
zMollisols
zOxisols
zSpodosols
zUltisols
zVertisols
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Taxonomic NamesSoil OrderAlfisolsAndisolsAridisolsEntisolsGelisolsHistosolsInceptisolsMollisolsOxisolsSpodosolsUltisolsVertisols
Names Ends in:-Alf-And-Id-Ent-El-Ist-Ept-Oll-Ox-Od-Ult-Ert
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Entisol Suborders
zAquents(L. Aqua, Water)
Wet Entisols
zFluvents(L. Fluvius, River)
Floodplain Soils
zOrthents(Gr. Orthos, True)
The Common Ones
zPsamments(Gr. Psammons, Sand)
Sandy Soils
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Entisol Great Groups
zSuborderAquents
(Wet Entisols)
zGreat GroupCryaquents - cold
Fluvaquents - flood plain
Hydraquents - water
Psammaquents - sand
Epiaquents - perched
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Entisol Great GroupszSuborder
Fluvents
(Floodplain soils)
zGreat GroupCryofluventsTorrifluvents - Torrid
(hot and dry)TropofluventsUdifluvents - Humid
(not dry in most years)Ustifluvents - Semi-arid
(between Udic-Aridic)Xerofluvents - Semi-arid
(moist cold winter - dry warm summer; Mediterranean climate)
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Soil Taxonomy
zSuborderPsamments
(Sandy Soils)
zGreat GroupCryopsamments
Quartzipsamments -Quartz
Torripsamments
Udipsamments
Ustipsamments
Xeropsamments
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Soil Taxonomy -How to interpret the formative elements
zSub group - Great group, Suborder, Ordery 4 3 2 1
y for example -
yVertic Udifluvent⌧4 - Vertic sub group - invert, shrink-swell, high clay
⌧3 - Udi(c) great group - humid
⌧2 - Fluv(ic) suborder - floodplain
⌧1 - Ent(isol) order - little soil development
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Aquic Soil Moisture Regimes
z Typic Subgroup Aquic Subordery____ ___aq___⌧wettest
z Aeric SubgroupAquic SuborderyAeric ___aq___⌧better aerated
z Aquic SubgroupyAquic ______⌧driest
From Mausbach 1992
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Subgroups
4 3 2 1Typic Fluvaquents
4 1 2Typical Entisols with aquic moisture
3regimes that occur on floodplains.
1. Order 3. Great Group2. Suborder 4. Subgroup
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Subgroups
4 3 2 1Mollic Fluvaquents
1 2Entisols with aquic moisture regimes that
3 occur on floodplains, and that have thick,
4dark surface layers.
1. Order 3. Great Group2. Suborder 4. Subgroup
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Subgroups
4 3 2 1Aeric Fluvaquents
1 3 2Entisols, occurring on floodplains, with an aquic
moisture regime that are not so wet. Better4
aerated in the “upper” part of the soil.
1. Order 3. Great Group2. Suborder 4. Subgroup
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Soil Taxonomy
Nature ofNumber Differentiating
Category of Taxa Characteristics
Series 15,000+ A series may have virtually the full range that is permitted in a family in several properties, but in one or more properties the range is restricted, such as:- Kind and arrangement of horizons
- Color- Texture- Structure
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Soil Taxonomy- Predicting “Problem” Hydric Soils
Recent depositional events exceed rate of typical hydric morphology formation. Also many sandy soils are Entisols.
EntisolsEnt
Fe immobilized, redox. features are often deeper than depth to water table. Some Andisols have thick, dark colored surface layers.
AndisolsAnd
Gray / White (high value / low chroma) horizon below A, not always indicative of wetness.
AlfisolsAlf
Why a ProblemSoil Order
Formative Element
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“Problem” Orders, cont.
High shrink-swell clays, surface hydrology. Many Vertisols also have dark-colored surface layers.
VertisolsErt
Some have gray / white (high value / low chroma) horizon below A, not necessarily indicative of wetness.
UltisolsUlt
Sandy surface layers, no redox features evident in upper part. (Use organic layers, dark surface, and stripped matrix indicators).
SpodosolsOd
Dark colored surface layers "mask" redox features. Check colors below mollic, allow surface layers to dry then look for redox (NTCHS Indicator F6).
MollisolsOll
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“Problem” Great Groups
Surface hydrology, recent depositionFloodplainFluv
Subsoil may be brownish color.Perched water table
Epi
Subsoil may be brownish color.
Perched water table situation.
Presence of a Duripan (dense layer)
Dur
Gray / White (high value / low chroma) horizon below A, not necessarily indicative of wetness
Presence of a calcic horizon
Calci, calc
Gray / White (high value / low chroma) horizon below A, not necessarily indicative of wetness
Albic horizonAlb
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Great Groups, cont.
High pH, low OM; no, or few redox features.
Presence of a Salic horizon
Sal
No, or low Fe content, also low OM.
Sandy texturePsamm
Dark colors may mask redox features.
High organic contentMelan
Multi-colored horizon below A horizon.
Presence of a Glossic horizon
Gloss
Subsoil may be brownish color, perched water table.
Presence of a Fragipan (dense layer)
Fragi
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Typic Haplosaprists
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Torry Series
Hydric
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Terric Haplosaprists
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Tawas Series
Hydric
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Lithic Cryofolists
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Ricker Series
Not Hydric
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Aquic Paleudalfs
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Katy Series
Not Hydric
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Aquic Glossudalfs
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Withee Series
Not Hydric
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Typic Aquisalids
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Unknown Series
Hydric
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Aquic Quartzipsamments
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Unknown Series
Not Hydric
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Oxyaquic Dystrudepts
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Paxton Series
Not Hydric
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Typic Humaquepts
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Birdsall Series
Hydric
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Vertic Argiaquolls
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Parnell Series
Hydric
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Argiaquic Argialbolls
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Tonka Series
Hydric
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Aeric Calciaquolls
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Hamerly Series
Not Hydric
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Aquic Haplorthods
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Sunapee Series
Not Hydric
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Aeric Alaquods
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Leon Series
Non-hydric phase
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Typic Endoaqults
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Othello Series
Hydric
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Typic Umbraqults
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Series Unknown
Hydric
![Page 56: SOILTAXONOMY - Home | NRCS to Identify Hydric Soils. Soil Taxonomy is A basic system of soil classification for ... zGreat Group Cryofluvents Torrifluvents - Torrid (hot and dry)](https://reader031.fdocuments.us/reader031/viewer/2022020104/5b31796a7f8b9a744a8bcb67/html5/thumbnails/56.jpg)
Chromic Epiaquerts
![Page 57: SOILTAXONOMY - Home | NRCS to Identify Hydric Soils. Soil Taxonomy is A basic system of soil classification for ... zGreat Group Cryofluvents Torrifluvents - Torrid (hot and dry)](https://reader031.fdocuments.us/reader031/viewer/2022020104/5b31796a7f8b9a744a8bcb67/html5/thumbnails/57.jpg)
Sharkey Series
Hydric
![Page 58: SOILTAXONOMY - Home | NRCS to Identify Hydric Soils. Soil Taxonomy is A basic system of soil classification for ... zGreat Group Cryofluvents Torrifluvents - Torrid (hot and dry)](https://reader031.fdocuments.us/reader031/viewer/2022020104/5b31796a7f8b9a744a8bcb67/html5/thumbnails/58.jpg)
Summary
zInterpretation of Soil Taxonomic names in Soil Survey manuscripts provides another tool for identifying hydric soils.yMost useful off-site as part of preliminary
analysisyAlso useful to identify potential “problem”
hydric soils