Lecture 23 Soil Taxonomy

Lecture 23 Soil Taxonomy - 1 Soil Morphology...

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Unformatted text preview: 1 Soil Morphology andClassification E horizon A horizon B horizon (Illuvial) (Elluvial) C horizon R horizon O horizon Master Horizons Master Horizons B horizon Enough information? Sub Sub-horizon designations horizon designations 2 Sub Sub-horizon designations horizon designations p – plowing/disturbance t – clay accumulation g – gleying h – illuvial organic matter w – development of color/structure o – oxic Subordinate distinctions within master horizons Subordinate distinction (p = plowed) Subordinate distinction (p = plowed) Disturbed surface horizon (cultivation, pasture, forestry) Used with the A master horizon (e.g. Ap horizon) Ap horizon Subordinate distinction (t = clay accumulation) Subordinate distinction (t = clay accumulation) Translocation of clay or formed in place Coatings or discrete Used with the B master horizon (e.g. Bt) If reduced, can be used with the g sub horizon (Btg) * 3 Subordinate distinction Subordinate distinction (g = (g = gleying gleying ) • Oxygen deprived or reduced state due to water saturation. • Reduction of iron (Fe III to Fe II) • low chroma • Often used with B master horizon (Bg horizon), also E and C horizon. gleyed material oxidized material oxidized Fe 3+ Fe 2+ Subordinate distinction (h = organic accumulation) Subordinate distinction (h = organic accumulation) • Accumulation of illuvial organic matter-metal complexes • Coatings on sand and discrete particles • h = “humic” • value and chroma approximately 3 or less • Used with the B master horizon (e.g. Bh horizon) Bh horizon “spodic horizon” * Subordinate distinction (w = color or Subordinate distinction (w = color or stucture stucture ) Non-illuvial development of color or structure “w” can = “weak” Commonly used with the B master horizon (e.g. Bw) Bw 4 Subordinate distinction Subordinate distinction (o = oxic horizon) Low activity clays Few weatherable materials Little rock structure Fe and Al oxides...
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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 23 Soil Taxonomy - 1 Soil Morphology...

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