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Varying Shades of Green: Selected Experience and Research on Green Roofs Simmons

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Varying Shades of Green: Selected Experience and Research on Green Roofs Simmons

  1. 1. Green roofs aren't created equal – <br />the performance of green roofs in a <br />subtropical climate<br />Mark Simmons<br />Lady Bird Johnson Wildflower Center, University of Texas<br />
  2. 2. “These particles can cause health problems including asthma, cardiovascular problems, lung cancer and premature death…”<br />
  3. 3. <ul><li>Air quality
  4. 4. Water quality
  5. 5. Water quantity
  6. 6. Heat island
  7. 7. GHGs
  8. 8. Energy use
  9. 9. Biophobia
  10. 10. Quality of life</li></ul>URBAN<br />PROBLEMS<br />
  11. 11. TRIED <br />TECHNOLOGY<br /><ul><li>Gas Exchange
  12. 12. Pollutant/Nutrient </li></ul> Absorption <br /><ul><li>Carbon Fixation
  13. 13. Water Loss and Capture
  14. 14. Cooling / Shade
  15. 15. Aesthetic
  16. 16. Non-Formal Education </li></li></ul><li>
  17. 17.
  18. 18. climate<br />Greenroof research concentrated on temperate latitudes <br />
  19. 19. climate<br />Research concentrated on temperate latitudes <br />BUT<br />Thermal and hydrologic advantages may be greater where there are extremes of high temperature and stochastic drought-storm events<br />
  20. 20. 6 greenroof manufacturers, <br />black and white (“cool”) roofs, <br />all replicated 3 times = 24 roofs total<br />
  21. 21. research<br />Measured<br /><ul><li>Temperature profiles
  22. 22. Water Retention
  23. 23. Water quality
  24. 24. Plant response</li></li></ul><li>161 F<br />March<br />107 F<br />87 F<br />Midnight<br />Midnight<br />Noon<br />August<br />
  25. 25. 133 F<br />122 F<br />95 F<br />Midnight<br />Midnight<br />Noon<br />August<br />
  26. 26.
  27. 27.
  28. 28.
  29. 29. November 2006 (0.5l)<br />October 2007 (0.5l)<br />December 2007 (20 l)<br />
  30. 30.
  31. 31. Bignonia capreolata<br />
  32. 32. Bouteloua curtipendula<br />
  33. 33. Echinacea purpurea <br />
  34. 34. Hesperaloe parvifolia <br />
  35. 35. Salvia farinacea <br />
  36. 36. High variation among plant species<br />
  37. 37. High variation among roof types<br />
  38. 38.
  39. 39.
  40. 40.
  41. 41.
  42. 42.
  43. 43. Survivorship (3 years)<br />
  44. 44. We need to track:<br /><ul><li>Establishment
  45. 45. Survivorship
  46. 46. Cover
  47. 47. Weed infestation</li></ul>Target = equilibrium plant community <br />
  48. 48. Mimic natural plant communities<br />
  49. 49. Weeds (grey) F=21.33; P<0.0001<br />Turf (black) F=10.14; P<0.0001<br />Native turfgrass mixes have fewer weeds, less water and mowing<br />Simmons, Bertlesen, Windhager & Zafian. (Submitted) <br />
  50. 50.
  51. 51. APGA - RESEARCH RESOURCE<br />National-wide research on regional plant suitability using APGA gardens<br />Pilot study present next year at conference<br />Call for applicants<br />
  52. 52. APGA - RESEARCH RESOURCE<br />Green roofs <br />Turf grass<br />Green walls <br />Invasive species control using aggressive regional native species<br />
  53. 53. Greatest need for regenerated ecosystem services <br />Financial resources<br />‘Waste’ products can enhance growth<br />High educational value<br />THE URBAN LANDSCAPE <br /> ADVANTAGE<br />

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