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Quantifying Foliar Responses of White Ash to Ozone and Simulated Acid Precipitation

其他書名	An Assessment Proposal for Forest Exposure Studies
出版	U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1990
URL	http://books.google.com.hk/books?id=ZdzoYv3_CCIC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋Seedling populations represent an important linkage for assessing the effect of air pollution on forests. This study examines the foliar responses of white ash seedlings to ozone and acid precipitation as a means of identifying atmospheric deposition effects on forests. With white ash seedlings, regression analysis revealed significant increases in foliar stippling, with rising ozone concentrations from 7 to 15 pphm. No stippling occurred in the absence of ozone or with acid rain treatment alone. However, exposure to ozone plus acid rain resulted in higher levels of foliar stipple as treatment concentrations increased. Until the inherent problems relating to the determination of the potential effects of air pollution on forests are resolved, the use of quantitative indices of injury to foliage and related growth impairments on susceptible and tolerant seedlings appears useful for assessing long-term ambient pollution effects on seedlings, trees, and forests.