Class 13b: Soils (pedology). What is soil? Not just dirt.

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Presentation transcript:

Class 13b: Soils (pedology)

What is soil? Not just dirt

Soil components Parent material: Temperature and moisture

Soil formation Bedrock breaks apart into regolith

Classifying soils: color Color tells you about chemistry

Classifying soils: texture Size, organization of particles

Classifying soils: texture

Classifying soils: structure Arrangement of soil particles

Classifying soils: structure Porosity: Permeability:

Soil moisture

Soil-water balance Warmer temperatures: higher ET Higher precipitation: higher percolation

Soil profiles

Soil classification More complicated than climate

Entisols Relativey new: most recent soils

Oxisols Old soils; minerals except oxides leached out

Aridisols Found in arid environments

Mollisols Most productive soil

Alfisols Significant aluminum (Al) and iron (Fe)

Spodosols Most acidic soil; minerals leached to lower horizon

Soil degradation Forms in 500 years, but can disappear in one

Soil degradation

Salinization: salty soil

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