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Plant Water Use and “Behaviour”

Plant Water Use and “Behaviour”. INTERNATIONAL. Michael Forster PhD (UNSW) Plant and Soil Scientist. Tree Water Use. Total Tree Water Use Hydraulic Redistribution Soil Stem Leaf Water Potential Gradients. Definition. Water Potential:

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Plant Water Use and “Behaviour”

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  1. Plant Water Use and “Behaviour” INTERNATIONAL Michael Forster PhD (UNSW) Plant and Soil Scientist

  2. Tree Water Use • Total Tree Water Use • Hydraulic Redistribution • Soil • Stem • Leaf • Water Potential Gradients

  3. Definition • Water Potential: • Free energy associated with water • Free energy is the potential to do work • Water moves from higher to lower potentials • Water moves from mountains to ocean

  4. Definition • Water Potential Units of Measurement: High Potential Low Potential

  5. Soil-Plant-AtmosphereContinuum Low Potential Atmosphere = -100 Bar Leaf air = -7.0 Bar Leaf cell = -1.0 Bar Trunk = -0.8 Bar Soil = -0.33 Bar High Potential

  6. Measuring Tree Water Use • Heat Ratio Method (HRM) • Heat Field Deformation (HFD)

  7. Measuring Tree Water Use

  8. HRM Technique

  9. HRM Technique

  10. Example HRM Data Diurnal Sap Flow Warm weather Data downloaded into Sap Flow Tool software: www.sapflowtool.com For analysis and visual presentation Cool Weather Sap Velocity (cm per hour) Time Rain event Nocturnal Sap Flow

  11. Case Study: Stem Hydraulic Redistribution Image from Nadezhdina et al. 2009

  12. Case Study: Stem Hydraulic Redistribution Image from Nadezhdina et al. 2009 Root Sap Flow Black Line: Northern Grey Line: Southern

  13. Case Study: Stem Hydraulic Redistribution Image from Nadezhdina et al. 2009 Stem Sap Flow Black Line: Northern Grey Line: Southern

  14. Case Study: Stem Hydraulic Redistribution Image from Nadezhdina et al. 2009

  15. More Case Studies: Hydraulic Redistribution Please refer to Conference Proceedings Leaf Mediated Hydraulic Redistribution Root Mediated Hydraulic Redistribution

  16. Total Tree Water Use Case Study: Trees as “Biopumps” • Antamina Mine • Largest mine in Peru • US$ 2.26bn investment • Copper & Zinc • Located 4,300m a.s.l.

  17. Total Tree Water Use Case Study: Trees as “Biopumps” • Copper & Zinc transported via gravity and water to sea port • Filters separate solids from water • What to do with all the water???

  18. Total Tree Water Use Case Study: Trees as “Biopumps” • 174 acre afforestation • 190,000 trees • Several species • Trees as Biopumps • Mine production dependent on Biopumps

  19. Total Tree Water Use Case Study: Trees as “Biopumps”

  20. Total Tree Water Use Case Study: Trees as “Biopumps” • Results from 6 months of sampling • Acacia: 3,200 litres • Tamarix: 1,500 litres • Algorrobo: 600 litres

  21. More Case Studies: Total Tree Water Use Please refer to Conference Proceedings Northern United Forestry Group: Kamarooka Project

  22. ICT International Pty Ltd Solutions for soil, plant and environmental research www.ictinternational.com.au sales@ictinternational.com.au Phone: 61267726770 Fax: 61267727616 PO Box 503, Armidale, NSW, Australia, 2350 INTERNATIONAL

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