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Updating Your Tree Inventory

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Tree inventories and assessments have become a popular way to make data-driven decisions and we can do better. By using your existing inventory data we can better understand how your urban forest is performing regarding tree growth rates, condition, and performance. Using case studies I have begun to answer some of these questions.

Published in: Environment
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Updating Your Tree Inventory

  1. 1. Updating Your Tree Inventory IOWA SHADE TREE SHORT COURSE FEBRUARY 21-23, 2017
  2. 2. Agenda • Why • How • Results
  3. 3. ISA Pledge I pledge as an ISA Certified Arborist to: • Adhere to the Code of Ethics, • Comply with all accepted professional standards, • Deliver safe & competent services with objective & independent professional judgment, • Disclose potential conflict of interest, and • Follow appropriate health & safety procedures to protect clients, employers, employees, and the public.
  4. 4. What’s Happening? Our urban forests are threatened by:  exotic and invasive insects and diseases Budgets Construction Weather patterns/events Policy Etc….. How can we best manage sustainably?
  5. 5. Where to Start? ? Public Tree Inventories Management Plans Urban Tree Canopy Analysis Tree Ordinances Hyperspectral Imagery i-Tree Benefits Model
  6. 6. Should the Foundation of Your Urban Forest Program be Built by the Lowest Bidder?
  7. 7. Why? • Increased Public Safety • Increased Efficiency • Justify Budgets • Documentation • Planning – Short-term – Long-term
  8. 8. Typical Tree Inventory Data Fields • GIS/GPS • Location (Area) • Identification • Diameter (DBH) • Condition • Maintenance Recommendation • Conflicts
  9. 9. Public Tree Inventory
  10. 10. How – Considerations New Vs. Update –Goals –How accurate • (addressing) –GIS data –Work histories
  11. 11. Ongoing
  12. 12. Ongoing
  13. 13. Ongoing – Archive History
  14. 14. New
  15. 15. Save Work History
  16. 16. Results – Bellefontaine Cemetery 2007 – 5,272 trees 2014 – 6,141 trees
  17. 17. Results – Bellefontaine Cemetery 2007 – 5,272 trees 2014 – 6,141 trees
  18. 18. Results – Bellefontaine Cemetery 2007 – 5,272 trees 2014 – 6,141 trees
  19. 19. Results – Bellefontaine Cemetery
  20. 20. Results – Bellefontaine Cemetery
  21. 21. Update
  22. 22. Update
  23. 23. Update
  24. 24. Results - Buffalo
  25. 25. Results - Buffalo 2001 2014 Difference Sites 124,445 127,080 2,635 Total DBH 871,173” 817,627” -53,546” Average DBH 7” 6” -1” # Species 281 247 -34 # Removals 668 2,707 2,039 # Planting Sites 48,761 44,619 -4,142
  26. 26. Relative Performance 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 MAPLE, NORWAY LINDEN, LITTLELEAF MAPLE, SILVER MAPLE, HEDGE MAPLE, RED MAPLE, CRIMSON KING LILAC, IVORY SILK MAPLE, DEBORAH SCHWEDLER CRABAPPLE HONEYLOCUST LINDEN, CRIMEAN PEAR, CALLERY HORSECHESTNUT, COMMON LONDON PLANETREE Condition Species with at least 1,000 trees Dead Fair Good Other Poor 21% 11% 20% 13% 37% 26% 14% 50% 12% 20% 24% 3% 13% 9%
  27. 27. Results - Buffalo 0.00 2.00 4.00 6.00 8.00 10.00 12.00 ASH SPECIES PINE, SPECIES BIRCH, ASIAN WHITE ASH, BLUE COTTONWOOD, EASTERN POPLAR, WHITE POPLAR, SPECIES WILLOW, WEEPING FIR, WHITE EMPRESS TREE MAPLE, BOXELDER VIBURNUM SPECIES BIRCH, EUROPEAN BEECH, PURPLE LEAF DBH Average of Growth
  28. 28. Top 10 Species Still Recommended for Removal (315) 0 10 20 30 40 50 60 70 80 NumberofTrees
  29. 29. Top 5 Species Still Poor Recommended for Removal 45, 43% 24, 23% 20, 19% 9, 9% 6, 6% MAPLE, NORWAY MAPLE, SILVER LINDEN, LITTLELEAF HORSECHESTNUT, COMMON CHERRY, KWANZAN 162 total trees
  30. 30. Poor Condition Performance 2001 – 5,698 Trees Updated Condition Number of Trees Dead 3 Poor 145 Fair 11 Good 0 Plant 293
  31. 31. Fair Condition Performance 2001 – 38,199 Trees Updated Condition Number of Trees Dead 298 Poor 3,445 Fair 26,830 Good 962 Plant 1,365
  32. 32. Good Condition Performance 2001 – 25,632 Trees Updated Condition Number of Trees Dead 259 Poor 717 Fair 8,952 Good 9,783 Plant 1,878
  33. 33. Growspace Performance Growspace Growth # of Trees < 4' 20,354” 26,071 4'-6' 38,955” 35,191 > 6' 61,438” 47,722
  34. 34. Planting Sites 2001 • 52,933 total vacant sites • 48,761 “real” planting sites 2014 • 44,619 available planting sites • 4,142 planted trees
  35. 35. Conclusions • Know why you want an update? – New vs update • Opportunity for data analysis – Species performance • Growspace • Condition • Growth rate • Maintenance • Costs • Frequency
  36. 36. Thanks! Josh Behounek Josh.Behounek@davey.com 573-673-7530 @treesrtheanswr

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