Lecture 16 Morphology and Orders

Lecture 16 Morphology and Orders - Soil Taxonomy and...

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Unformatted text preview: Soil Taxonomy and Classification 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 Diagnostic Surface Horizons Diagnostic Surface Horizons Epipedons Mollic Umbric Ochric Histic Melanic Plaggen Anthropic Very common Human-derived specialized Vegetation established O.M. accumulation time Organic Matter Accumulation Organic Matter Accumulation Histic Mollic, Umbric ochric Parent material t max = 3000 yrs Diagnostic Sub-surface Horizons Diagnostic Subsurface Diagnostic Subsurface Horizons Horizons Clays Organic Matter Oxides Formation Translocation Transformation Organic Matter Clays Oxides smectites Subsurface Horizons Subsurface Horizons Kaolinite Also: salts, carbonates, sulfides Dark colors Metals (Fe, Al) Iron Aluminum Formation Translocation Transformation Diagnostic Subsurface Diagnostic Subsurface Horizons Horizons Albic Argillic Spodic Oxic Kandic Cambic Sombric sulfuric Natric Agric Calcic Gypsic Salic Duripan Fragipan Placic Subordinate Distinctions Diagnostic Subsurface Horizons Diagnostic Subsurface Horizons Albic (white) Horizon Light-colored (Value > 6 moist ) Elluvial (E master horizon*) Low in clay, Fe and Al oxides Generally sandy textured Low chemical reactivity (low CEC) Typically overlies Bh or Bt horizons albic *not all E horizons are albic horizons Argillic Horizon Illuvial accumulation of silicate clays Illuvial based on overlying horizon Clay bridges Clay coatings Diagnostic Subsurface Horizons Bt horizon Diagnostic Subsurface Clay Horizons Argillic Horizon Kandic Horizon Activity of Clays High Low Illuviation of clay Necessary Not Necessary Diagnostic Subsurface Horizons Diagnostic 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 Elluviation (E horizon and A horizons) Organic matter Clays...
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This note was uploaded on 07/31/2011 for the course SOS 3022 taught by Professor Staff during the Fall '08 term at University of Florida.

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Lecture 16 Morphology and Orders - Soil Taxonomy and...

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