i-Tree Ecosystem Analysis

Summary

Understanding an urban forest’s structure, function and value can promote management decisions that will improve human health and environmental quality. An assessment of the vegetation structure, function, and value of the Washington, D.C. urban forest was conducted during 2015. Data from 201 field plots located throughout Washington, D.C. were analyzed using the i-Tree Eco model developed by the U.S. Forest Service, Northern Research Station.

• Number of trees: 2,431,000
• Most common species: American beech, Boxelder, Tulip tree
• Percentage of trees less than 6″ (15.2 cm) diameter: 62.5%
• Pollution removal: 619 tons/year ($26.0 million/year)
• Carbon storage: 649,000 tons ($46.2 million)
• Carbon sequestration: 26,700 tons/year ($1.90 million/year)
• Oxygen production: 42,700 tons/year ($0 /year)
• Avoided runoff: 42,386,000 cubic feet/year ($2.82 million/year)
• Building energy savings: $705 thousand/year
• Avoided carbon emissions: $168 thousand/year
• Structural values: $4.28 billion

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