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sw23 - Soil Taxonomy and Classification Soil Taxonomy...

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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 Hierarchy Soil Taxonomy Hierarchy 63 250 1400 8000 Kingdom Phylum Class Order Family Genus Species
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Surface Horizons : Mollic- thick, dark colored, high %B.S., structure Umbric – same as mollic, but lower B.S. Ochric – pale, low O.M., thin Histic – 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 oxides Albic – light colored, elluvial, low reactivity Diagnostic Horizons
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Soil Taxonomy Soil Taxonomy Diagnostic Epipedons Diagnostic Subsurface horizons Moisture Regimes Temperature Regimes Age Texture Depth
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Wet Dry Moisture Regimes Moisture Regimes Aquic – poor aeration, reduced iron Udic- dry < 90 total days Ustic - limited but is present Aridic- moist <90 total days Xeric - dry cold Hot Temperature Regimes Temperature Regimes Cryic – icy cold Frigid – lower than 8 o C Mesic – between 8 and 15 o C Thermic – between 15 and 22 o C Hyperthermic - > 22 o C
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Order Suborder Great group Sub group Family Series 12 19,000 Soil Orders Soil Orders Soil forming processes, presence or Absence of major diagnostic horizons Similar genesis 63 250 1400 8000
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Soil Orders Soil Orders Entisol Histosol Inceptisol Alfisol Ultisol Spodosol Mollisol Oxisol Andisol Gelisol Aridisol Vertisol Ent- Hist- Incept- Alf- Ult- Spod- Moll- Ox- And- Gel- Arid- Vert- Rec ent Hist ic (organic) Incept ion Television alien Ult imate Spod os (wood ash) Moll is (soft) ox ide And o (black) Gel id (cold) Arid (dry) Vert o (turn)
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