Soil Biology

Soil Biology - 1 Soil Biology Chapter 10 SS 121 2 Soil...

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1 1 Soil Biology Chapter 10 SS 121 2 Soil Biology • Plants • Macrofauna (animals) • Microorganisms – Bacteria – Actinomycetes – Fungi 3 Plants • Add OM • Nutrient cycling • Canopy intercepts precipitation • OM protects ground surface • Roots serve several functions. .. 4 Roots • Provide support for plant (buttressing) • Take up water, nutrients • Store nutrients • Anchor soil • Encourage soil aggregation • Provide habitat for soil microorganisms 5 Root • Apical meristem • Zone of elongation • Root hairs • Rhizosphere. .. 6 Root • Root hairs • Zone of elongation • Root cap Credit: 1976 J.P. Martin, et al., eds. SSSA, Madison WI. 7 Macrofauna • Add OM
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2 • Cycle OM and nutrients • Mix soil through burrowing • Create macroporosity • Mammals, reptiles, amphibians, arthropods, worms, mollusks, … 8 9 10 • Juvenile oribatid mites, on forest litter – breaking down O horizon material Collohmannia sp. Credit 11 More arthropods 12 Earthworms
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Soil Biology - 1 Soil Biology Chapter 10 SS 121 2 Soil...

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