Influence of two growing seasons of experimental ozone fumigation on photosynthetic characteristics of white oak seedlings

Foster, Jeffrey R.; Loats, Ken V.; Jensen, Keith F.

doi:10.1016/0269-7491(90)90128-y

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…However, end-of-season biomass determinations showed that growth was unaffected by the treatments. Foster et al (1990) found no effect on Q. alba even after two seasons' exposure to elevated O3. Measurements in that situation, like those here, were made after fumigation had finished.…”

Section: Discussionmentioning

confidence: 73%

“…Samuelson & Edwards (1993) found that carboxylation capacity was sensitive to chronic O3 exposure in lower canopy leaves of Q. rubra but, as in this study, seedlings did not demonstrate a significant reduction in carboxylation capacity. Foster et al (1990), investigating another species of oak, Q. alba, found no effect on carboxylation capacity nor were there any signs of visible injury or premature senescence. No detectable signs of visible injury or premature senescence were evident in the present stud}'^ w^ith Q. robur, even in September.…”

Section: Discussionmentioning

confidence: 95%

“…Of the latter, the genus Quercus has received some attention. Different species of Quercus have shown varying sensitivity to O3 in terms of visible damage (Guderian, Tingey & Rabe, 1985) and net photosynthetic carbon uptake (Reich, Schoettle & Amundson, 1986;Foster, Loats & Jensen, 1990). Although photosynthesis is frequently decreased by exposure to O3, the mech-anism(s) of inhibition has received little detailed analysis.…”

Section: Introductionmentioning

confidence: 99%

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The effect of ozone fumigation over one season on photosynthetic processes of Quercus robur seedlings

Farage

1996

New Phytologist

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S U M M A R YQuercus robur saplings were exposed to elevated Og (80 nmol mol"^) in hemispherical glasshouses for one growdng season in order to assess the effects of this pollutant on photosynthesis. Measurements of chlorophyll fluorescence induction kinetics in mid-summer showed that plants exposed to both control O3 (20 nmol mor^) and elevated O3 treatments experienced significant photoinhibition of photosynthesis. Elevated O3 increased photoinhibition. At the end of the summer, photosynthetic CO, uptake, measured at either light saturation or under light-limiting conditions, was not significantly different between plants from the two O3 treatments. Although the maximum rate of carboxylation velocity, as estimated from the response of COg uptake to intercellular COg concentration, the maximum quantum efficiency and the maximum rate of electron transport measured in vivo were decreased by O3 exposure, the responses differed betw^een plants and, overall, the decreases were not statistically significant. The results suggest that Og levels that are at present reached for a few days during photochemical episodes in the summer are not sufficient to cause measurable lasting damage to photosynthetic COj uptake in oak saplings assessed over one growing season.

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Section: Discussionmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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The effect of ozone fumigation over one season on photosynthetic processes of Quercus robur seedlings

Farage

1996

New Phytologist

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Air Pollution Effects on the Diversity and Structure of Communities

Armentano¹,

Bennett²

1992

Air Pollution Effects on Biodiversity

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Free-air fumigation of mature trees

Werner

Fabian

2002

Environ Sci & Pollut Res

120

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A novel system for continuous and controlled free-air fumigation of mature tree canopies with ozone is described. Ozone generated from oxygen is diluted with air in a pressurized tank and conducted into the canopies by a system of 100 PTFE tubes hanging down from a grid fixed above the crowns. With 45 calibrated outlets per tube providing a constant flow of 0.3 l/min each, a total volume of about 10*10*15 m3 comprising 5 beech and 5 spruce canopies is fumigated. The spatial ozone distribution in the fumigated volume as well as surrounding reference tree canopies is controlled by continuous measuring instruments installed at 4 levels and a dense array of passive samplers. The system will later be used for CO2 fumigation as well. Results of the first year of continuous operation, with 2 * ambient ozone levels having been achieved, are reported.

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Influence of two growing seasons of experimental ozone fumigation on photosynthetic characteristics of white oak seedlings

Cited by 5 publications

References 26 publications

The effect of ozone fumigation over one season on photosynthetic processes of Quercus robur seedlings

The effect of ozone fumigation over one season on photosynthetic processes of Quercus robur seedlings

Air Pollution Effects on the Diversity and Structure of Communities

Free-air fumigation of mature trees

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