GES 175, Science of Soils Lecture 6, Soil Biology.

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Presentation transcript:

GES 175, Science of Soils Lecture 6, Soil Biology

Impact of Macro-organisms

Channeling Water

Natural Soil Mixing

The Little Guys

Soil Bacteria

Aerobic Organisms Food Source Organic carbon* Ammonium Ion (NH 4 + ) Ferrous Iron (Fe 2+ ) Hydrogen Sulfide (H 2 S) Electron Acceptor Molecular Oxygen (O 2 )

Anaerobic Organisms Food Source Organic carbon* Ammonium Ion (NH 4 + ) Ferrous Iron (Fe 2+ ) Hydrogen Sulfide (H 2 S) Electron Acceptor Nitrate (NO 3 - ) Manganese (Mn 4+ ) Ferric Iron (Fe 3+ ) Sulfate (SO 4 2- )

legumes Bacterial-Plant Symbiosis

- bacteria require plant for growth; plant gains ‘free’ source of available N Nitrogen Fixation * Symbiotic relation between bacteria and plants: -e.g., legumes + rhizobium * Grasses-Azospirillum/Azobactor