6 - Soil Type and Classification

6 - Soil Type and Classification - Soil Type and...

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Soil Type and Classification
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Soil Components Organic matter Inorganic matter Living organisms Dead organisms Litter Detritus Humus Inorganic minerals Organic Fraction Inorganic Fraction
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Dark Color Indicates Organic Matter
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Soil Profile = layers in soil observed with depth; Individual layers are horizons Bedrock O horizon – contains litter on surface, humus + OM beneath A horizon – various stages of breakdown of organic matter B horizon – mineral soil in which organic compounds have been converted into inorganic C horizon – unmodified parent material
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Zonation in Soil Profile Bedrock A horizon – may show color gradient as OM decreases – eluvial horizons = leaching B horizon – inorganic compounds leached from A horizon accumulate here – illuvial horizons = accumulation Rain, Leaching
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Soil Profile determined by Vegetation Climate ---- rainfall and leaching Weathering ---- geological history, age Topography Parent Material Etc.
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Soil Profile under Deciduous Forest Basic profile type, shows typical horizons and layers
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Soil Profile under Pine Forest Shallow O horizon Clear, leached A horizon Spodic horizon at top of B horizon
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Soil Profile under Grassland Very deep, rich A horizon
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Agricultural Modifications to Soil Profile Plow layer Hard Pan Little or no O horizon
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This note was uploaded on 03/01/2010 for the course PCB 4683 taught by Professor Williams,j during the Spring '08 term at University of Central Florida.

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6 - Soil Type and Classification - Soil Type and...

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