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Abstract
We studied the effect of high ozone (O
3) concentration (110-490 nmol mol
-1) on regenerating aspen (
Populus tremuloides) and maple (
Acer saccharum) trees at an open-air O
3 pollution experiment near Rhinelander WI USA. This study is the first of its kind to examine the effects of acute O
3 exposure on aspen and maple sprouts after the parent trees, which were grown under elevated O
3 and/or CO
2 for 12 years, were harvested. Acute O
3 damage was not uniform within the crowns of aspen suckers; it was most severe in the mature, fully expanded photosynthesizing leaves. Young expanding leaves showed no visible signs of acute O
3 damage contrary to expectations. Stomatal conductance played a primary role in the severity of acute O
3 damage as it directly controlled O
3 uptake. Maple sprouts, which had lower stomatal conductance, smaller stomatal aperture, higher stomatal density and larger leaf surface area, were tolerant of acute O
3 exposure. Moreover, elevated CO
2 did not ameliorate the adverse effects of acute O
3 dose on aspen and maple sprouts, in contrast to its ability to counteract the effects of long-term chronic exposure to lower O
3 levels.
Citation
Darbah, Joseph N.T.; Jones, Wendy S.; Burton, Andrew J.; Nagy, John; Kubiske, Mark E. 2011. Acute O
3 damage on first year coppice sprouts of aspen and maple sprouts in an open-air experiment. Journal of Environmental Monitoring. 13: 2436-2442.
