Notes: Lead Contamination of Roadside White Pine

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Lead contamination of the growth of the previous year (twig plus needle samples) of eastern white pine was determined at various distances from an E-W section of an Interstate highway with a traffic density of approximately 24,000 vehicles daily. Lead contamination decreased regularly with increasing distance from the highway edge, was consistently higher on trees south of the roadway than on those to the north, and was generally greater on branches sampled from the side of the tree closest to the highway as contrasted with branches analyzed farthest from the road on individual test trees. Samples up to 15 m distance from the highway often were contaminated with more than 100 ppm lead, much of which was presumably impacted on exterior surfaces. Forest Sci. 17:195-198.

Keywords: Pinus strobus; air pollution; foliar analysis; wood tissue analysis

Document Type: News

Affiliations: Assistant Professor, School of Forestry, Yale University, New Haven, Conn 06511

Publication date: June 1, 1971

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