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Soil Atmosphere

Soil Atmosphere. Temperature (Chapter 7). Ch 7 Outline. I. Section 7.8: Processes affected by soil temperature II. Section 7.10 – only “soil temperature variations” III. Section 7.11: Soil temperature control. I. Soil Temperature – the Process A. Plant processes

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Soil Atmosphere

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  1. Soil Atmosphere Temperature (Chapter 7)

  2. Ch 7 Outline I. Section 7.8: Processes affected by soil temperature II. Section 7.10 – only “soil temperature variations” III. Section 7.11: Soil temperature control

  3. I. Soil Temperature – the Process A. Plant processes B. Microbial processes C. Freezing/thawing D. Permafrost E. Heating by fire F. Contaminant removal

  4. A. Plant Processes • Seed germination • Root functions • High temps=death/life • Low temps=slow chemical and bio rxns • Narrow range for optimum growth Figure 7.18

  5. B. Microbial Processes • Biological zero=5oC • Double for each 10oC rise • Useful for nutrient mngmt planning/disease control Figure 7.20

  6. I. Soil Temperature – the Process A. Plant processes B. Microbial processes C. Freezing/thawing D. Permafrost E. Heating by fire F. Contaminant removal

  7. Effects of Fire Figure 7.24

  8. II. Thermal properties of soils: temperature fluctuations A. Seasonal B. Vertical C. Daily

  9. Seasonal and Vertical Variations Figure 7.31 Note: daily fluctuations lag behind air temperature min and max

  10. III. Soil Temperature Control A. Organic residue management=buffer temperature extremes 1. forest floor 2. conservation tillage

  11. Tillage Effects C4NQVP Figure 7.34

  12. III. Soil Temperature Control A. Organic residue management=buffer temperature extremes 1. forest floor 2. conservation tillage B. Plastic mulches=specialty use 1. generally increase soil temps 2. clear plastic > temp increase than black C. Moisture control 1. more water=lower temps 2. management=improve drainage

  13. Review I. Soil Temperature – the Process II. Temperature fluctuations III. Soil Temperature Control

  14. Soil Water Chapter 5

  15. Chapter 5 Outline • I. General Properties of Water • II. Capillary Action • III. Energy Concepts • IV. Flow of Water • V. Specific Examples

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