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Effects of Chronic Doses of Ozone on Loblolly Pine: Photosynthetic Characteristics in the Third Growing Season

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Gas exchange characteristics of loblolly pine seedlings were measured in the third growing season of ozone fumigations to determine the effects of long-term ozone exposure on photosynthetic capacity. Light and CO2 response curves indicated significant decreases of 21% and 27%, respectively, in light-saturated and CO2-saturated photosynthetic capacities at 2 x ambient ozone (92 ppb 12-hr seasonal mean) compared to charcoal-faltered (CF) air, approximately 0.5 x ambient ozone (29 ppb 12-hr seasonal mean). Differences in the response curves suggest changes in light-harvesting and biochemical efficiencies as well as changes in the activity of RuBP Carboxylase and the regeneration rate of RuBP. Chlorophyll and carotenoid conditions per unit leaf area were decreased at the high ozone treatment in older flushes. Stomatal resistance limited photosynthesis by about 29% in both CF and 2 x ambient ozone treated plants, suggesting that chronic ozone exposure did not affect stomatal control in loblolly pine. For. Sci. 35(3):745-755.
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Keywords: Pinus taeda; carotenoids; chlorophyll

Document Type: Journal Article

Affiliations: Professor, School of Forestry and Environmental Studies, Duke University, Durham, NC 27706

Publication date: 1989-09-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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