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WATER RELATIONS (Chapter 6)

WATER RELATIONS (Chapter 6). Terrestrial. 23 o C. 23 o C. Water Saturation of Air. Saturation Water Vapor Density (g/m 3 ) Saturation Water Vapor Pressure (kPa). Fig. 6.2 in Molles 2010. Fraction of Water Saturation in Air I. Saturation. Relative Humidity. Actual.

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WATER RELATIONS (Chapter 6)

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  1. WATER RELATIONS (Chapter 6) Terrestrial

  2. 23oC 23oC

  3. Water Saturation of Air Saturation Water Vapor Density (g/m3) Saturation Water Vapor Pressure (kPa) Fig. 6.2 in Molles 2010

  4. Fraction of Water Saturation in Air I Saturation Relative Humidity Actual http://upload.wikimedia.org/wikipedia/commons/8/84/Relative_humidity.jpg Actual Water Vapor Density Rel. Humidity = X 100 Saturation Water Vapor Density

  5. Fraction of Water Saturation in Air II Vapor Pressure Deficit Saturation Actual Vapor Pressure Deficit = Saturation Vapor Pressure – Actual Vapor Pressure

  6. Potential for Evaporative Water Loss Fig. 6.3 in Molles 2010

  7. Water Relations of a Terrestrial Animal Fig. 6.7 in Molles 2013

  8. Plant Water Relations Fig. 7.7 in Molles 2008

  9. Water Movement between Soil and Plants

  10. WATER MOVEMENT: OSMOSIS Osmosis:

  11. Osmosis and the Plant Cell 11

  12. Water Potential (ψ ) = Ability to Do Work (Measured in pressure units: MPa) Fig. 6.5 in Molles 2010

  13. Water Potential (ψ ) = Ability to Do Work (Measured in pressure units: MPa)

  14. Which has greater Water Potential? ψ1 ψ2

  15. Which has Higher Water Potential? (Effect of Dissolved Substances) ψ1 ψ2 5

  16. Which has Higher Water Potential? (Effect of Dissolved Substances) ψ1 ψ2

  17. Which soil has greater Water Potential? (Matric Forces) Wet Sand Wet Clay ψ1 ψ2

  18. Which root has greater Water Potential? (Effect of Dissolved Substances) ψ1 ψ2 = Salt

  19. Predicting Direction of Water Flow: Soil Water Potential and Root Water Potential Roots ψ1 Soil ψ2

  20. In Which System is there a Greater Difference in Water Potential 8 10 9 Dry Air Moist Air

  21. Will Tranpiration Occur?

  22. Water Relations of a Terrestrial Plant Fig. 7.7 in Molles 2008

  23. Water Relations: Terrestrial Animal vs. Plant Fig. 6.7 in Molles 2013

  24. Adaptations for Desert Living: Plants and Animals Fig. 6.20 in Molles 2013

  25. Water Movement in Aquatic Environments Saltwater Freshwater

  26. Water (and Salt) Movement in Aquatic Organisms Isoosmotic: Hyperosmotic: Hypoosmotic:

  27. Osmotic Stress in Hyperosmotic (Freshwater) Organisms Fig. 6.4 in Molles 2010

  28. Osmoregulation in Hyperosmotic Aquatic Organisms I Fig. 6.28 in Molles 2010

  29. Osmoregulation in Hyperosmotic Aquatic Organisms II http://www.emc.maricopa.edu/faculty/farabee/biobk/contractilevac.gif

  30. Osmotic Stress in Hypoosmotic (Marine) Organisms Fig. 6.4 in Molles 2010

  31. Osmoregulation in Hypoosmotic Aquatic Organsims I Fig. 6.27 in Molles 2010

  32. Osmoregulation in Hypoosmotic Aquatic Organisms II http://www.kcl.ac.uk/ip/christerhogstrand/courses/hb0223/images/water&8.jpg

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