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Beech (Fagus sylvatica) response to ozone exposure assessed with a chlorophyll a fluorescence performance index

Authors
Landolt, W.
Bucher, J.B.
Published in Environmental Pollution. 2000, vol. 109, no. 3, p. 501-507
Abstract This paper describes a relationship between ozone exposure, biomass, visual symptoms and a chlorophyll a fluorescence performance index for young beech trees (Fagus sylvatica). The plants were exposed to four levels of ozone in open-top fumigation chambers (50, 85, 100% of ambient, and 50% of ambient+30 nl l−1 ozone) that fluctuated in parallel with ambient ozone during a single growing season. The trees were fumigated in the four treatments with ozone levels corresponding to an AOT40 (accumulated exposure above a threshold of 40 nl l−1) of 0.01, 3.35, 7.06 and 19.70 μl l−1 h, respectively. Highly significant differences were found between the 50% of ambient+30 nl l−1 ozone treatment and all other treatments, with a 70.5% reduction in primary photosynthetic performance, as measured with the PI index. The reduction of the PI values demonstrated a high correlation with visual symptom development (r2=0.98), and by the end of September with biomass loss (r2=0.99). A significant ozone exposure–response relationship was found between AOT40 and primary photochemistry (r2=0.97). Thus, analysis of PI provides an alternative method for regional monitoring of tree health within the context of the currently employed AOT40.
Keywords FluorescenceOzoneBiomassPerformance indexVisual symptoms
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CLARK, Alexander et al. Beech (Fagus sylvatica) response to ozone exposure assessed with a chlorophyll a fluorescence performance index. In: Environmental Pollution, 2000, vol. 109, n° 3, p. 501-507. https://archive-ouverte.unige.ch/unige:83288

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Deposited on : 2016-04-21

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