Record Display for the EPA National Library Catalog


Main Title Acid Deposition and Forest Decline.
Author Johnson, A. H. ; Siccama, T. G. ;
CORP Author Pennsylvania Univ., Philadelphia. ;Yale Univ., New Haven, CT. School of Forestry and Environmental Studies.;Corvallis Environmental Research Lab., OR.
Year Published 1983
Report Number EPA/600/J-83/326;
Stock Number PB86-139540
Additional Subjects Acidity ; Precipitation(Meteorology) ; Forest trees ; Metals ; Trace elements ; Vulnerability ; Mortality ; Toxicity ; Stress(Physiology) ; Elevation ; North America ; Reprints ; Acid precipitation ; Picea abies ; Norway spruce trees
Library Call Number Additional Info Location Last
NTIS  PB86-139540 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 14p
The location, topography and other characteristics of the high-elevation forests of eastern North America cause them to be receptors of high levels of acid deposition and airborn trace metals. No other major forested areas in the U.S. are subjected to such intensely acid cloud moisture, such heavy acid deposition, and such high rates of trace-metal deposition. The vulnerability of these forests to the pollutants has not been documented, but because of the spruce decline it is indeed reasonable to suspect vulnerability. Current data shows several possible pathways by which acid deposition could contribute to spruce mortality, but at this time none of these pathways are supported by convincing evidence. The framework for Al toxicity proposed by Ulrich is not consistent with the data generated. The evidence regarding a triggering effect of drought is substantiated by data, but it is not know whether drought is sufficient to cause the dieback and decline or whether an additional stress from pollution is involved. In viewing the spruce dieback and decline as a stress-related syndrome, it is suggested the possibility of multiple stresses is possible. (Copyright (c) 1983 American Chemical Society.)