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The pine forests of the Rhone Valley are severelydamaged. Possible causative agents are fluoride andother harmful gases such as S0<sub>2</sub>, HCl and NO<sub>x</sub> in theemissions of nearby aluminium smelters and chemicalplants. Drought and aging may also have contributedto the damage. Core samples and trunk discs fromdamaged and undamaged Stands near Martigny wereinvestigated using annual ring analysis. After Visualdating of the samples by means of «pointer» ringsformed during dry years, growth disturbances werepinpointed. Radiodensitometrical measurements followed,and age trends were eliminated using mathematicalgrowth functions. A model of the relationshipbetween annual ring, temperature and precipitationwas constructed for the emission-free period1874–1940 and extrapolated to give the values expectedfor the last hundred years if growth were influencedby climatic factors only. Annual incrementsfor the period 1941–1979 were 20–30% below theexpected value, regardless of tree age, indicating aharmful factor not primarily related to drought oraging. Growth disturbances occurred most commonlyduring the droughts of the forties and may be regardedas resulting from the emissions which began in 1938when a new aluminium smelter was built in the mainvalley: it stood in the mainstream of the prevailingwinds and was without filters until 1965. The harmfulemissions of the late thirties may have damaged thetrees to such an extent that they could no longerwithstand natural Stresses and finally died 30–40 yearslater. Although the fluoride emissions are not causallyrelated to the forest damage, they provide a validexplanation of the results

Jahrringanalytische Untersuchungen in immissionsgefährdeten Waldschadengebieten des Walliser Rhonetals