Impact of Ambient O3 on Physiological, Visual, and Growth Responses of Sensitive Eastern Hardwood Tree Species Under Natural and Varying Site Conditions

EPA Grant Number: R825244
Title: Impact of Ambient O3 on Physiological, Visual, and Growth Responses of Sensitive Eastern Hardwood Tree Species Under Natural and Varying Site Conditions
Investigators: Skelly, John , Davis, Donald D. , Ferdinand, Jon , Savage, James E. , Schaub, Marcus , Steiner, Kim C. , Stevenson, Richard E. , Zhang, Jianwei
Current Investigators: Skelly, John , Davis, Donald D. , Steiner, Kim C.
Institution: Pennsylvania State University
EPA Project Officer: Chung, Serena
Project Period: November 1, 1996 through October 31, 1999 (Extended to October 31, 2001)
Project Amount: $494,000
RFA: Air Quality (1996) RFA Text |  Recipients Lists
Research Category: Air , Air Quality and Air Toxics


The objectives of this project include: 1) the determination of ozone exposure/response relationships to the ontogeny of visible foliar injury symptoms on sensitive eastern hardwood tree species under ambient ozone exposures and under natural forest conditions; 2) the determination of the interrelationships between microsite factors and leaf physiological responses leading to differences in foliar symptom expressions using forest and open-top chamber exposures; 3) determining pre-visual changes in Rubisco as an indicator of pre-visual physiological manifestations, symptoms, early leaf senescence, and growth patterns; and 4) determining whether radial growth or the relationship between ring width variation and climate differ in relation to foliar symptom severity within and among natural populations of three ozone sensitive hardwood tree species. The studies will be conducted within the Shenandoah National Park, Virginia, where previous studies have identified significant differences in ozone induced foliar injuries to three sensitive hardwood species with elevation and microsite conditions (soil moisture, aspect, etc.) apparently playing significant roles in the development of symptoms under the respective ambient ozone exposures. Exposure/response measures will be interpreted in light of several ozone exposure parameters of significance to the new ozone National Ambient Air Quality Standards.

Publications and Presentations:

Publications have been submitted on this project: View all 15 publications for this project

Journal Articles:

Journal Articles have been submitted on this project: View all 2 journal articles for this project

Supplemental Keywords:

air, ambient air, atmosphere, ozone, ecological effects, biology, ecology, Pennsylvania, PA, Region 3., RFA, Scientific Discipline, Air, Geographic Area, Ecosystem Protection/Environmental Exposure & Risk, Ecology, Ecosystem/Assessment/Indicators, Ecosystem Protection, exploratory research environmental biology, Chemical Mixtures - Environmental Exposure & Risk, State, Ecological Effects - Environmental Exposure & Risk, Ecological Effects - Human Health, Ecology and Ecosystems, tropospheric ozone, Atmospheric Sciences, Ecological Risk Assessment, Biology, Ecological Indicators, ecological exposure, ecological effects, environmental monitoring, growth response, ambient ozone data, Virginia (VA), Pennsylvania, growth rate, ambient air, forest ecosystem, climate variations, leaf physiological responses, air pollution models, National Ambient Air Quality Standards, atmospheric chemical cycles, chemical kinetics, ecological assessment, ozone induced foliar damage, ozone sensitivity, atmospheric reaction products, sensitive tree species, ecological response, Eastern hardwood tree, PA, ambient aerosol particles

Progress and Final Reports:

  • 1997
  • 1998
  • 1999
  • 2000
  • Final Report