02 Lect 2 Soil Environment - Soil as a habitat for...

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Soil as a habitat for microorganisms Soil as a habitat for microorganisms 1) 1) Soil Soil physical characteristics physical characteristics (or everything you need to know about soil in 1 hour) Reading : Textbook from Sylvia et al., 2004. Chapter 2, pages 26-35 I. Definition of a soil II. Soil formation and soil types III. Soil profile IV. Soil composition V. Soil physical properties V.1. Texture V.2. Density V.3. Porosity V.4. Structure / aggregation Soil definition “the naturally occurring, unconsolidated mineral and organic material at the earth’s surface that provides an environment for living organisms ¬ exchange of matter and energy between the biosphere , lithosphere , atmosphere , hydrosphere and detritosphere
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The soil habitat - Very high biomass - Very high diversity >10 9 bacteria/g soil Up to 1km of fungal hyphae/g soil >10 4 species The soil habitat From Textbook, Sylvia et al., 2004
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Microbial growth occurs in extreme conditions Gobi desert Hydrothermal vents Hot springs Oil wells Polar ice caps Soil formation and soil types Soils may are >10 cm thick and extend from the earth’s surface into the underlying parent material Mineral soils: < 20% organic matter Organic soils: >20-30% organic matter (= only 0.9% world’s soils) Organic soil
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Organic soils (peatlands) They cover little of the world’s land surface (1%) but they hold ~ 20% of the global soil C Peat mining Living organisms Time Parent material Climate Topography TIME WEATHERING HUMUS FORMATION PROFILE DEVELOPMENT Soil formation and soil types
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A E B C Bedrock Bedrock Soil profile topsoil subsoil parent material O layers= horizons If interested, look at http://soils.cals.uidaho.edu/soilORDERS/orders.htm for more information on the 12 soil orders Water and air
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This note was uploaded on 04/02/2010 for the course ESPM 131 taught by Professor Pallud during the Spring '10 term at University of California, Berkeley.

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02 Lect 2 Soil Environment - Soil as a habitat for...

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