Quantifying Foliar Responses of White Ash to Ozone and Simulated Acid Precipitation PDF Download
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Author: Leon S. Dochinger Publisher: ISBN: Category : Foliar diagnosis Languages : en Pages : 8
Book Description
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.
Author: Leon S. Dochinger Publisher: ISBN: Category : Foliar diagnosis Languages : en Pages : 8
Book Description
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.
Author: Thomas A. More Publisher: ISBN: Category : Recreational surveys Languages : en Pages : 522
Book Description
Long-term recreation planning requires an understanding of recreation participation patterns. This study examined Vermonters' participation in 27 leisure activities from three domains (outdoor, resource based, and indoor) to see how such participation differed in each domain. Indoor activities were the most popular, followed by resource-based activities and general outdoor activities. Overall participation declined with age, though this effect was mitigated somewhat for older parents. Other socioeconomic and demographic variables had limited effects on participation.
Author: Leon S. Dochinger
Author: Leon S. Dochinger
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Author: Thomas A. More
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