06 Lec 6 Soil Temperature for bspace

06 Lec 6 Soil Temperature for bspace - Soil as a habitat...

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Unformatted text preview: Soil as a habitat for microorganisms Soil as a habitat for microorganisms 5) Soil temperature 5) Soil temperature Reading : Textbook from Sylvia et al., 2004. Chapter 2, page 47 Article from Kashefi and Lovley, 2003. Science. 15: 934. I. Importance of soil temperature II. Tolerance of microorganisms to temperature II.1. Cardinal temperatures II.2. Classification of organisms based on T preference II.3. Temperature effects on microbial cells III. Temperature relationships III.1. Arrhenius equation III.2. Q 10 relationship IV. Soil temperature IV.1. Factors affecting soil temperature V.2. Temperature fluctuations V. Microbial growth and adaptations at extreme temperatures Importance of soil temperature Key determinant of both distribution and activity of soil microorganisms Direct effect on microbial physiology- Rate of metabolic processes- Effect on enzyme activity and membrane fluidity Indirect effects by affecting soil physico-chemical characteristics Affects nutrient/substrate diffusion Affects aeration Tolerance to extremes of T Soil microbial activity virtually ceases below 5 C (41F), a benchmark T referred to as biological 0 . Cardinal temperatures:- minimum T - optimum T - maximum T 30-40 C 30-40 C Optima as low as 4 C and some>90 C Growth: from below freezing to 113 C ( Pyrolobus fumarii ) (even 121 C for Strain121) Cardinal temperatures Pyrolobus fumarii Strain 121- Found in 1997 in a black smoker hydrothermal vent at the mid Atlantic ridge at 3600m deep - Can grow at 113 C (and can survive autoclaving for 1h)- Found in 2003 in vent on Pacific Ocean- Can grow at 121...
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06 Lec 6 Soil Temperature for bspace - Soil as a habitat...

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