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06 Lec 6 Soil Temperature for bspace

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

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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
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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
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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
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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 ° C (and survive exposure to 130 ° C)
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