Updating Your Tree Inventory: How to Track Changes Over Time
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This document discusses updating an urban tree inventory for a city. It provides details on why regular updates are important, how to approach an update, and examples of results from previous inventory updates. Key reasons to update include increased public safety, efficiency, and justifying budgets. Important factors for the update include whether it is a new inventory or updating an existing one. Results shown include changes in tree numbers, diameters, and species composition from inventory updates in two cities over time periods of 7-13 years. Regular updates allow tracking of tree performance and growth.
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Updating Your Tree Inventory: How to Track Changes Over Time
- 1. Updating Your Tree Inventory IOWA SHADE TREE SHORT COURSE FEBRUARY 21-23, 2017
- 2. Agenda • Why • How • Results
- 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. 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. Where to Start? ? Public Tree Inventories Management Plans Urban Tree Canopy Analysis Tree Ordinances Hyperspectral Imagery i-Tree Benefits Model
- 6. Should the Foundation of Your Urban Forest Program be Built by the Lowest Bidder?
- 7. Why? • Increased Public Safety • Increased Efficiency • Justify Budgets • Documentation • Planning – Short-term – Long-term
- 8. Typical Tree Inventory Data Fields • GIS/GPS • Location (Area) • Identification • Diameter (DBH) • Condition • Maintenance Recommendation • Conflicts
- 10. How – Considerations New Vs. Update –Goals –How accurate • (addressing) –GIS data –Work histories
- 11. Ongoing
- 12. Ongoing
- 13. Ongoing – Archive History
- 14. New
- 16. Results – Bellefontaine Cemetery 2007 – 5,272 trees 2014 – 6,141 trees
- 17. Results – Bellefontaine Cemetery 2007 – 5,272 trees 2014 – 6,141 trees
- 18. Results – Bellefontaine Cemetery 2007 – 5,272 trees 2014 – 6,141 trees
- 21. Update
- 22. Update
- 23. Update
- 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. 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. 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. Top 10 Species Still Recommended for Removal (315) 0 10 20 30 40 50 60 70 80 NumberofTrees
- 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. Poor Condition Performance 2001 – 5,698 Trees Updated Condition Number of Trees Dead 3 Poor 145 Fair 11 Good 0 Plant 293
- 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. 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. Growspace Performance Growspace Growth # of Trees < 4' 20,354” 26,071 4'-6' 38,955” 35,191 > 6' 61,438” 47,722
- 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. Conclusions • Know why you want an update? – New vs update • Opportunity for data analysis – Species performance • Growspace • Condition • Growth rate • Maintenance • Costs • Frequency
Notes de l'éditeur
- It is no secret that our urban forests are under increasing pressure from diverse and common problems throughout the country. Today, more than ever this seems to more and more prevalent, as budgets are decreased, space is limited and the need for green space is increasing. It is important to remember that your Urban Forest is part of the City’s infrastructure and it is not a place that people “go to” but something that we are in everyday oftentimes all day.
- Once you make a commitment to proactively and sustainably manage your urban forest the 1st step is often the hardest. “We have too much of a backlog of work, we don’t know what we have, we don’t have the funding, etc.” I think it is important to think of the entire forest, both public and private, and capitalize on the low hanging fruit. There are many urban forest mgmt tools available and each one has advantages, disadvantages with specific costs and outcomes. With a Master Plan you are in a better position to maximize opportunities that are presented and can more readily incorporate findings into results.