@article {772,
	title = {Eine jahrringanalytische Studie zum Nadelbaumsterben in der Schweiz},
	year = {1983},
	note = {Copies of this are available through the Tree Ring Laboratory; please contact the lab for more information. 

This edition of the reports is from the Swiss Federal Institute of Forestry Research. },
	month = {08/1983},
	institution = {Eidgenossische Anstalt fur das Forstliche Versuchswesen},
	address = {Birmensdorf},
	abstract = {Application of annual ring analysis in investigations of conifer die-back in Switzerland

Obviously unhealthy confiders show abrupt tree-ring growth reductions which are datable without measurements.  By investigation of large amount of samples on different sites in Switzerland we calculated the areal distribution of damaged trees and the damage occurrence within time.  Geographical distribution and time patterns yield to relations between climatic and pollution events.  The heavy damages on fir started in Switzerland 1956.  Approximately 75\% of all firs in Switzerland{\textquoteright}s central plateau show growth reductions.  Local damages exist in the Rhone-valley since 1920. },
	keywords = {climate, damages, environment, fir, growth, growth reduction, pollution, Switzerland, tree ring},
	author = {Schweingruber, Fritz H. and Kontic, Raymond and Winkler-Seifert, Amanda}
}
