PROCEEDINGS: Index of Abstracts
PREDICTING THE EFFECTS OF TROPOSPHERIC OZONE ON
FOREST PRODUCTIVITY IN THE NORTHEASTERN U.S.
Scott V. Ollinger-1, John D. Aber-1, and Peter B. Reich-2
1-Complex Systems Research Center, University of New Hampshire,
Durham, NH 03824. 2-Department of Forest Resources, University of
Minnesota, St. Paul, MN 55108.
It is widely believed that tropospheric ozone presents a significant
anthropogenic stress on forest ecosystems. Although much information
has been collected regarding ozone effects at the seedling and leaf
level, we do not have a reliable means of estimating the effect
on mature, native forests. For the present study, we incorporated
leaf-level ozone response information into an ecosystem model of
forest production known as PnET-II in order to make whole-forest
predictions that account for factors such as light attenuation,
canopy ozone gradients and water stress. We ran the model using
ambient ozone data from 64 locations across New York and New England.
Predictions indicate reductions in annual NPP of from 2 to 17 percent
under mean ozone from 1987-1992. Reductions were greatest in southern
portions of the region on soils where drought stress was absent.