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首页> 美国政府科技报告 >Field Assessment of the Effects of Ambient Ozone on Cotton 'Gossypium hirsutum' in the San Joaquin Valley
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Field Assessment of the Effects of Ambient Ozone on Cotton 'Gossypium hirsutum' in the San Joaquin Valley

机译：环境臭氧对圣华金河谷棉花'棉花'影响的田间评价

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The study was conducted to determine whether air pollution induced yield losses estimated for cotton on the basis of controlled studies reasonably represent yield losses actually occurring in the field. The experimenters exposed field grown cotton plants to either carbon filtered or ambient air inside open topped chambers at four field sites representing a range of air pollution levels found in the San Joaquin Valley. 'S-J2' cotton, the cultivar most widely grown in the San Joaquin Valley, was used in the experiment. Yield reductions due to ambient air pollutants at three of the sites (Five Points, Hanford, Shafter) were similar to those predicted using dose-response equations derived from previous studies. Actual yield loss at the fourth site (Dinuba) was greater than expected. Visible injury reflected differences in pollutant exposure, but differences in injury levels were not statistically significant. Ambient air pollutant exposure did not affect stomatal conductance or transpiration. Differences detected in these variables were intermittent and likely due to site factors other than air pollution.

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