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Impact of Ozone On the Growth and Reproduction of Understorey Plants in the Aspen Zone of Western U.S.A.

Published online by Cambridge University Press:  24 August 2009

Max Harward  and
Michael Treshow
Max Harward
Affiliation:
Air Pollution Science Special Fellow and Professor of Biology, respectively, Department of Biology, University of Utah, Salt Lake City, Utah 84112, U.S.A.
Michael Treshow
Affiliation:
Air Pollution Science Special Fellow and Professor of Biology, respectively, Department of Biology, University of Utah, Salt Lake City, Utah 84112, U.S.A.
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Extract

The purpose of this study was to learn how ozone might affect the growth and reproduction of understorey species of the aspen community, and thereby influence its stability and composition. Plants of 14 species belonging to the aspen community were grown in greenhouse chambers and fumigated with ozone for 3 hours each day, 5 day per week, throughout their growing-seasons. The plants were exposed to 30 pphm (parts of ozone per hundred million parts of air), 15 pphm, ambient air reaching 5–7 pphm during about 2 hours each day, and filtered air.

Exposure to ambient air did not appear to cause a significant reduction of total plant-weight in any of the species investigated, while plant-weight of Achillea millefolium and Isatis tinctoria grown under such conditions was significantly greater than that of control plants grown in filtered air. At 15 pphm, growth of Isatis tinctoria, Madia glomerata, and Viola italica, was significantly reduced; on the other hand, growth of Ligusticum porteri and Polygonum aviculare was increased. At 30 pphm, growth was substantially suppressed in all plants except Chenopodium album and Phacelia heterophylla.

Type
Main Papers
Information
Environmental Conservation , Volume 2 , Issue 1 , Spring 1975 , pp. 17 - 23
Copyright
Copyright © Foundation for Environmental Conservation 1975

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References

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