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Science 9 January 1981:
Vol. 211. no. 4478, pp. 167 - 169
DOI: 10.1126/science.211.4478.167
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Articles

Relative Humidity: Important Modifier of Pollutant Uptake by Plants

S. B. McLAUGHLIN 1 and G. E. TAYLOR 1

1 Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

Laboratory measurements of foliar uptake of sulfur dioxide and ozone by red kidney beans demonstrated a strong effect of relative humidity on internal pollutant dose. Foliar uptake was enhanced two- to threefold for sulfur dioxide and three- to fourfold for ozone by an increase in relative humidity from 35 to 75 percent. For the same exposure concentration, vegetation growing in humid areas (such as the eastern United States) may experience a significantly greater internal flux of pollutants than that in more arid regions.

Submitted on July 30, 1980
Revised on October 17, 1980


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Ambient Levels of Ozone Reduce Net Photosynthesis in Tree and Crop Species.
P. B. REICH and R. G. AMUNDSON (1985)
Science 230, 566-570
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