| Autor: |
Olszyk, David M., Bytnerowicz, Andrzej, Kats, Gerrit, Dawson, Philip J., Wolf, Joanne, Thompson, C. Ray |
| Zdroj: |
Journal of Environmental Quality; October 1986, Vol. 15 Issue: 4 p363-369, 7p |
| Abstrakt: |
Winter wheat (Triticum aestivumL. ‘Yecora Rojo’) and lettuce (Lactuca salivaL. ‘Empire’) were exposed in the field to SO2or ambient O3to determine the effects of these air pollutants on important winter grown crops. Plants were exposed with tubular air exclusion systems or in open‐top field chambers to ambient air, or filtered air plus 0, 0.03, 0.07 or 0.15 µL SO2L−1. Exposures were continuous from 18 Jan. to 7 May 1984 for wheat and from 18 Jan. to 13 Mar. 1984 for lettuce. Harvests to evaluate early plant growth were made after 2 to 3 weeks of exposure for each crop; final harvests were made at the end of the exposures. Wheat yield was decreased with exposure to 0.15 µL SO2L−1in open‐top field chambers, but was not affected by SO2exposure in air exclusion systems. Lettuce yield was decreased with exposure to 0.15 µL SO2L−1in air exclusion systems, but was not affected by SO2exposure in open‐top chambers. Neither wheat nor lettuce yield was reduced by ambient O3in either air exclusion systems or open‐top chambers. The results from the two types of exposure systems could not becompared statistically due to differences in experimental design and soil topography. However, the differences in plant growth between the two systems were dramatic when compared to outside plots. Wheat and lettuce growth and yield was only slightly greater with air exclusion systems than in outside plots, but much greater in open‐top field chambers than in outside plots. |
| Databáze: |
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