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Davey Resource Group, Inc. Tree Inventory Analysis & Maintenance Strategy Page 12 i-TREE RESULTS DRG used i-Tree Eco, a tool within the i-Tree suite, to model benefits provided by Orono’s inventoried public trees. i-Tree Eco combines tree inventory data with local air pollution and weather data to quantify the environmental benefits of a community’s trees (Table 1). By framing trees and their benefits as dollars saved per year, i-Tree models can help communities understand trees as both a natural resource and an economic investment. Understanding the composition, functions, and economic value of trees is essential for making informed planning and management decisions. This knowledge not only helps to better understand how decisions can affect human health and environmental quality but also empowers communities to advocate for the funding required to effectively manage and care for their valuable public trees. Table 1. Summary of benefits provided by the most common inventoried street trees. MOST COMMON TREES INVENTORIED COUNT PERCENT OF TOTAL BENEFITS PROVIDED BY STREET TREES CO₂ STORED CO₂ SEQUESTERED AVOIDED RUNOFF AIR POLLUTION REMOVED REPLACEMENT VALUE COMMON NAME % TONS TONS/YEAR GAL/YEAR LBS/YEAR DOLLARS Green ash 1,212 26.4% 266.9 5.0 653,574 520 $611,208 Boxelder 431 9.4% 179.0 3.2 253,332 200 $263,173 Sugar maple 389 8.5% 237.0 2.5 290,367 220 $262,421 American elm 258 5.6% 77.6 1.7 126,786 100 $154,167 American basswood 208 4.5% 92.6 1.3 234,370 180 $211,149 Blue spruce 171 3.7% 25.4 0.4 47,847 40 $42,800 Silver maple 157 3.4% 212.2 2.4 265,733 220 $319,720 Black walnut 150 3.3% 57.7 1.4 109,164 80 $90,539 Slippery elm 138 3.0% 21.9 0.7 55,224 40 $61,797 Eastern red cedar 131 2.9% 36.9 0.4 70,225 60 $62,655 Northern white cedar 119 2.6% 20.3 0.2 24,520 20 $33,884 Northern hackberry 113 2.5% 7.0 0.1 100,276 80 $74,669 Siberian elm 101 2.2% 25.9 0.4 26,076 20 $33,531 White spruce 99 2.2% 26.6 0.2 43,510 40 $37,846 Bur oak 99 2.2% 142.7 0.9 116,552 100 $170,979 All Other Trees Inventoried 826 17.8% 535 6.4 574,575 360 $624,458 Total 4,602 100% 1,964 27.4 2,992,130 2,280 $3,054,995 24