08 Lec 8 rhizosphere - Soil as a habitat for microorganisms...

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Reading : Textbook from Sylvia et al., 2004. Chapter 11, page 242-262 I. Definitions II. Properties of the rhizosphere 1. Water potential 2. Nutrients 3. O 2 /CO 2 4. pH III. Plant –derived compounds: rhizodeposition IV. Rhizosphere effect: beneficial impacts on soil microorganisms V. Benefits for plants 1. Improved access to nutrients 2. Biological control of plant pathogens 3. Plant-growth promoting effects Soil as a habitat for microorganisms Soil as a habitat for microorganisms 7) Rhizosphere 7) Rhizosphere
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Decaying OM Soil aggregates Rhizosphere Soil is a C and energy-starved ocean with few islands of high activity (hot spots ) 90% of soil activity in <10% soil volume growth of roots stimulates microbial growth and is driving force for rhizosphere development
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Definitions Rhizosphere (Hiltner, 1904) - Soil under root influence - 1-5 mm
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Source: Hinsinger, 2004 Physical, chemical and biological interactions
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Definitions Rhizosphere (Hiltner, 1904) - Soil under root influence - 1-5 mm Rhizoplane - Root surface (<100 μm) Endorhizosphere - Root tissues colonized
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Root Root Rhizo sphere Rhizoplane
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1. Water potential Properties of the Rhizosphere From textbook, Sylvia et al., 2004
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2. Nutrients Zone of selective uptake of nutrient ions: depletion zones Properties of the Rhizosphere From : Hinsinger, 2004
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3. O Properties of the Rhizosphere Can lead to anaerobic patches near roots
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4. pH
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08 Lec 8 rhizosphere - Soil as a habitat for microorganisms...

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