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Using SOILTAXONOMY to Identify Hydric Soils

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Using SOILTAXONOMY to Identify Hydric Soils
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  1. Using SOILTAXONOMYto Identify Hydric Soils

  2. 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.

  3. Soil Taxonomy • Procedure: Soils are classified on the basis of: • Soil properties observed in the field (e.g., soil horizons, texture, color, pH) and • Soil 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).

  4. Soil Taxonomy Entisol Fluvent Ustic Mollic Fine-loamy, mixed, frigid Korchea

  5. Fine-loamy, mixed (calcareous), frigid, Mollic Ustifluvent Korchea Series Not Hydric

  6. Soil Taxonomy Nature of Number Differentiating Category of Taxa Characteristics Order 12 Soil-forming processes as indicated by presence or absence of major diagnostic horizons

  7. Alfisols Andisols Aridisols Entisols Gelisols Histosols Inceptisols Mollisols Oxisols Spodosols Ultisols Vertisols Soil Orders

  8. Soil Order Alfisols Andisols Aridisols Entisols Gelisols Histosols Inceptisols Mollisols Oxisols Spodosols Ultisols Vertisols Names Ends in: -Alf -And -Id -Ent -El -Ist -Ept -Oll -Ox -Od -Ult -Ert Taxonomic Names

  9. Aquents (L. Aqua, Water) Wet Entisols Fluvents (L. Fluvius, River) Floodplain Soils Orthents (Gr. Orthos, True) The Common Ones Psamments (Gr. Psammons, Sand) Sandy Soils Entisol Suborders

  10. Suborder Aquents (Wet Entisols) Great Group Cryaquents - cold Fluvaquents - flood plain Hydraquents - water Psammaquents - sand Epiaquents - perched Entisol Great Groups

  11. Suborder Fluvents (Floodplain soils) Great Group Cryofluvents Torrifluvents - Torrid (hot and dry) Tropofluvents Udifluvents - Humid (not dry in most years) Ustifluvents - Semi-arid (between Udic-Aridic) Xerofluvents - Semi-arid (moist cold winter - dry warm summer; Mediterranean climate) Entisol Great Groups

  12. Suborder Psamments (Sandy Soils) Great Group Cryopsamments Quartzipsamments - Quartz Torripsamments Udipsamments Ustipsamments Xeropsamments Soil Taxonomy

  13. Soil Taxonomy -How to interpret the formative elements • Sub group - Great group, Suborder, Order • 4 3 2 1 • for example - • Vertic 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

  14. Aquic Soil Moisture Regimes • Typic Subgroup Aquic Suborder • ____ ___aq___ • wettest • Aeric Subgroup Aquic Suborder • Aeric ___aq___ • better aerated • Aquic Subgroup • Aquic ______ • driest From Mausbach 1992

  15. Subgroups 4 3 2 1 Typic Fluvaquents 4 1 2 Typical Entisols with aquic moisture 3 regimes that occur on floodplains. 1. Order 3. Great Group 2. Suborder 4. Subgroup

  16. Subgroups 4 3 2 1 Mollic Fluvaquents 1 2 Entisols with aquic moisture regimes that 3 occur on floodplains, and that have thick, 4 dark surface layers. 1. Order 3. Great Group 2. Suborder 4. Subgroup

  17. Subgroups 4 3 2 1 Aeric Fluvaquents 1 3 2 Entisols, occurring on floodplains, with an aquic moisture regime that are not so wet. Better 4 aerated in the “upper” part of the soil. 1. Order 3. Great Group 2. Suborder 4. Subgroup

  18. Soil Taxonomy Nature of Number 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

  19. Soil Taxonomy- Predicting “Problem” Hydric Soils

  20. “Problem” Orders, cont.

  21. “Problem” Great Groups

  22. Great Groups, cont.

  23. Typic Haplosaprists

  24. Torry Series Hydric

  25. Terric Haplosaprists

  26. Tawas Series Hydric

  27. Lithic Cryofolists

  28. Ricker Series Not Hydric

  29. Aquic Paleudalfs

  30. Katy Series Not Hydric

  31. Aquic Glossudalfs

  32. Withee Series Not Hydric

  33. Typic Aquisalids

  34. Unknown Series Hydric

  35. Aquic Quartzipsamments

  36. Unknown Series Not Hydric

  37. Oxyaquic Dystrudepts

  38. Paxton Series Not Hydric

  39. Typic Humaquepts

  40. Birdsall Series Hydric

  41. Vertic Argiaquolls

  42. Parnell Series Hydric

  43. Argiaquic Argialbolls

  44. Tonka Series Hydric

  45. Aeric Calciaquolls

  46. Hamerly Series Not Hydric

  47. Aquic Haplorthods

  48. Sunapee Series Not Hydric

  49. Aeric Alaquods