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Matt Ritter

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Matt Ritter

  1. 2. Arbor Day Foundation hardiness zones reflect warmer climate 1990 2006
  2. 3. Climate Change Projections
  3. 4. % of Human Population
  4. 5. Biodiversity is diminishing at a rate even faster than the last mass extinction at the end of the Cretaceous Period, 65 million years ago, with possibly two-thirds of existing terrestrial species likely to become extinct by the end of this century — the vast majority of them unknown to science at the time they disappear - Peter Raven, 2011
  5. 6. Foreword by Peter Raven
  6. 12. What role can we play in helping the problems facing our planet and our future?
  7. 13. 1. Work for more species diversity in California’s urban forests
  8. 18. Origins of California ’s Urban Trees
  9. 19. California Native Trees in Municipal Forests <ul><li>9,100 species of plants in California </li></ul><ul><li>~6,000 native species </li></ul><ul><li>294 tree species </li></ul><ul><li>78 species are suitable for urban environments </li></ul><ul><li>20 species commonly used in urban forests </li></ul>
  10. 22. Evolutionary Relationships Among California ’s Commonly Cultivated Trees
  11. 23. Tree Species in the Urban Forest <ul><li>All phyla and 83% of orders with trees are represented in California </li></ul><ul><li>Largest genera in California (most species): </li></ul><ul><ul><li>Eucalyptus </li></ul></ul><ul><ul><li>Quercus </li></ul></ul><ul><ul><li>Acacia </li></ul></ul><ul><ul><li>Pinus </li></ul></ul><ul><ul><li>Acer </li></ul></ul>
  12. 24. Diversity in Urban Forests J.C. Raulston’s Second Law of Landscape Plant Diversity: In any given region of the United States, 40 shrubs and trees make up 90% of the landscape plantings.
  13. 25. Diversity in Urban Forests Muller and Bornstein Arb. & Urb. For. 2010. 36(1): 18–27 309 species
  14. 26. Diversity in Municipal Forests <ul><li>188 – Average # of species on California municipality tree surveys </li></ul><ul><li>49 – Average # of species on California municipality approved planting lists </li></ul><ul><li>Only 29% of existing species are approved for future planting </li></ul><ul><li>According to Lawrence Lesser 15 species account for ~50% of planted trees in Southern California </li></ul>Lesser, L.M. 1996. Journal of Arboriculture 22:180–185.
  15. 28. Promote Diverse Urban Forests <ul><li>Diverse urban forests are more resilient to climate change </li></ul><ul><li>Diverse urban forests help conserve biodiversity </li></ul><ul><li>Find undeservedly rare trees in your area </li></ul><ul><li>Work with cities and nurseries to grow and plant more species </li></ul><ul><li>Experiment with new, appropriate trees </li></ul><ul><li>Add 10 new species to your cities approved planting list </li></ul>
  16. 29. 2. Learn your trees and teach other people about them
  17. 31. “ The average person recognizes more than 1,000 corporate logos, but can identify fewer than 10 plants and animals native to his or her locality.” - David Orr
  18. 42. Promote Tree Knowledge <ul><li>Relearn the trees in your urban forest </li></ul><ul><li>Work on making your area’s tree inventory accurate and up-to-date </li></ul><ul><li>Learn species characteristics and plant appropriate trees </li></ul><ul><li>Learn the correct names of trees </li></ul><ul><li>Learn the natural history stories of trees </li></ul><ul><li>Share those stories with others </li></ul>
  19. 43. 3. Promote a clear educational message about the value of trees
  20. 44. Life without trees is a lower quality life.
  21. 45. Trees Sequester and Store Carbon Nowak 1994, USDA FS Technical Report, Radnor, PA, pp. 83-94
  22. 46. Trees Reduce Energy Consumption Carver, Unger, and Parks, 2004, Environmental Management 34: 650-655
  23. 47. Trees Cool Cities Wilson et. al., 2003, Remote Sensing of Environment 86: 303-321
  24. 48. More Trees = More Wildlife Donnelly and Marzluff, 2006, Urban Ecosystems 9: 99-117
  25. 49. More Trees Correlate with Lower Crime Kuo and Sullivan, 2001, Environment and Behavior 33: 343-367 & 543-571
  26. 50. More Trees Correlate with Lower Crime Kuo and Sullivan, 2001, Environment and Behavior 33: 343-367 & 543-571
  27. 51. More Trees Correlate with Lower Crime Kuo and Sullivan, 2001, Environment and Behavior 33: 343-367 & 543-571
  28. 52. Trees Promote Happiness Fuller et. al., 2007, Biology Letters 3: 390-394
  29. 53. Life without trees is a lower quality life.
  30. 54. Summary <ul><li>Work for more diversity in California’s urban forests </li></ul><ul><li>Learn your trees and teach other people about them </li></ul><ul><li>Promote a clear educational message about the value of trees </li></ul>
  31. 55. The beautiful trees that grace our neighborhoods did not sprout at random. Tree-lined streets have been woven into a living fabric that shades and soothes our souls. In a real biological sense, trees are our home. That is the deepest meaning of the urban forest. - David Paul Bayles

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