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Davey Resource Group, Inc. <br />Tree Inventory Analysis & Maintenance Strategy <br />Page 13 <br />ANNUAL BENEFITS <br />The i-Tree Eco model estimates the annual value of three environmental benefits: carbon sequestration, air <br />pollutant removal, and stormwater runoff reduction. The model also calculates the lifetime carbon storage <br />of inventoried trees as well as their replacement value. The inventoried trees in Orono provide over <br />$18,679 of air quality, stormwater management, and carbon sequestration benefits each year (Figure <br />8). <br />The amount of benefits provided by a tree is also influenced by species. Table 2 summarizes the key tree <br />species that provide the greatest contribution to Orono’s annual benefits based on the results of the i-Tree <br />Eco analysis of the public tree inventory. The black maple, as well as bigtooth aspen, paper birch, eastern <br />cottonwood, weeping willow, and various oak and maple, are major contributors to the annual <br />quantifiable benefits within the public tree resource. <br />IMPROVING AIR QUALITY <br />Trees and other vegetation improve air quality by intercepting and filtering particulate matter from the air, <br />including dust, ash, pollen, and smoke. Their leaves also absorb harmful gaseous pollutants like ozone, <br />nitrogen dioxide, and sulfur dioxide; and reduce ozone formation by shading surfaces and reducing air <br />temperatures. Since airborne pollutants can have serious effects on human health, this benefit is extremely <br />important, especially in heavily developed areas. 17% of Orono’s annual public tree benefits are <br />associated with air pollution removal and are derived from the air pollutant removal. <br />The inventoried trees in Orono remove 2,280 lbs. of airborne pollutants each year; a service valued at <br />$3,251 (Table 3). <br />SPECIES <br />ANNUAL <br />BENEFITS PER <br />TREE <br />Black maple $15.90 <br />Bigtooth aspen $14.09 <br />Paper birch $13.92 <br />Eastern cottonwood $10.72 <br />Weeping willow $10.65 <br />Silver maple $10.46 <br />Northern red oak $10.00 <br />Northern pin oak $9.86 <br />White oak $7.39 <br />Kentucky coffee tree $7.29 <br />REPLACEMENT <br />VALUE <br />$3.05 million <br />AIR POLLUTION <br />REMOVAL <br />2,280 pounds <br />$3,251 <br />CARBON <br />SEQUESTRATION <br />27 tons <br />$11,854 <br />AVOIDED <br />STORMWATER <br />RUNOFF <br />399,990 gallons <br />$3,574 <br />Figure 8. Breakdown of annual benefits provided by the <br />inventoried tree resource. <br />Table 2. The inventoried species which provide the <br />greatest annual benefit per tree. <br />25