Potential effects of ozone, climate, and spruce budworm on Douglas-fir growth in the Wasatch Mountains

This study assessed the potential for ozone injury to vegetation in the central Wasatch Mountains of Utah by determining if Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco) experienced reduced growth since the onset of high ozone concentrations. Dendrochronological techniques were used to model Douglas-fir growth in six cen- tral Wasatch Mountain stands, where ozone concentrations suggest the possibility of injury to vegetation, and in four Bear River stands, where ozone concentrations are lower than injury thresholds. Previous-year growth, temperature, and Palmer's Z index variables explained 53-70% of the variance in annual growth. Reduced Douglas-fir growth, not ex- plained by the model or insect and disease records, occurred after 1970 in the central Wasatch Mountains but not in the Bear River Mountains. Douglas-fir growth in the central Wasatch Mountains was slightly negatively correlated with the previous-year ozone concentrations in nearby Salt Lake valley. Between 1962 and 1973, a fluctuating budworm population due to varying spring precipitation was suggested to have replaced precipitation as the factor limiting tree growth, causing an anomalous negative relationship between precipitation and Douglas-fir growth. Because of a suite of possible factors (e.g., undetected climatic variables, fungal pathogens, competitive interactions) influencing Douglas-fir growth, ozone may be one factor in a larger stressor complex reducing growth. Resume : Cette etude avait pour but d'evaluer si la vegetation a subi des dommages dus a l'ozone, dans la partie cen- trale des monts Wasatch en Utah, en determinant si le douglas (Pseudotsuga menziesii var. glauca (Beissn.) Franco) a connu une reduction de croissance depuis que la concentration d'ozone a augmente. La croissance du douglas a ete modelisee a l'aide de la dendrochronologie dans six peuplements de la partie centrale des monts Wasatch, ou les

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