05 Lect 05 soil pH - 1/29/2010 Soil as a habitat for...

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1/29/2010 1 Soil as a habitat for microorganisms 4) Soil pH I. Range of soil pH II. Importance of soil pH III. Variations in soil pH II. Soil pH and microorganisms Reading : Textbook from Sylvia et al., 2004. Chapter 2, pages 46-47 Soil pH gives a measure of the acidity or alkalinity Soil pH ofasoil pH = -log[H + ] Higher [H + ] = high acidity (pH 0-7 = acidic) Higher [OH - ] = high alkalinity (pH 7-14 = basic) At pH=7 (neutral) , equal number of H + and OH - in solution
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1/29/2010 2 pH<1: acid mine drainage pH:2-4: acid sulfate soils pH:3.5-5.8: forest soils pH:8.5-10.5: sodic soils pH>10: soda lakes pH determines bacterial diversity at continental scale From Fierer and Jackson, PNAS, 2006 ¬ Highest diversity in neutral soils ¬ Lowest in acidic soils
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1/29/2010 3 pH determines the availability of nutrients - The wider the bar, the greater the availability pH determines the availability of nutrients Deficiency Toxicity Deficiency
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1/29/2010 4 Variations in soil pH From Modern Soil Microbiology, Van Elsas et al., 2007 Variations in soil pH Respiration : CO 2 + H 2 O H
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05 Lect 05 soil pH - 1/29/2010 Soil as a habitat for...

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