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RESPONSE OF FOREST TREES TO SULFUR, NITROGEN, AND ASSOCIATED POLLUTANTS
Citation:
Mattson, K., L. Arnaut, G. Reams, S. Cline, C. Peterson, AND R. Vong. RESPONSE OF FOREST TREES TO SULFUR, NITROGEN, AND ASSOCIATED POLLUTANTS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-90/074.
Description:
The National Acid Precipitation Assessment Program created Forest Response Program (FRP) to assess the effects of acidic deposition on trees and forests in regions of the United States. esearch front the FRP and other programs is summarized in four Major Program Output documents that address policy questions regarding forest condition, mechanisms of effects of air pollutants, and projected responses of pollutants on forests. his document summarizes information available up to February, 1990. he major findings include several observations on mechanisms of effect. here is evidence that supports the hypothesis that acidic deposition alters soil chemical properties. he rate of changes in soil chemical properties and how trees may respond to the changes is not certain. ontrolled exposures of simulated acid precipitation most often showed no effect on growth of seedlings, but caused delayed development of cold tolerance in red spruce seedlings. zone caused decreased growth in most seedlings tested, but at levels higher than typical ambient ozone concentrations. pecies that may be sensitive to ozone at ambient levels include ponderosa pine and loblolly pine. he findings allow conclusions regarding consistency between forest condition and pollutant levels in several regions of the United States.