Ozone injury across the Southern United States, 2002â06
Author: Rose, Anita K.; Coulston, John W.
Source: Gen. Tech. Rep. SRSâ118. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station. 25 p.
In the Eastern United States, hourly concentrations of ozone typically range from 30 to 50 parts per billion
(ppb), with events that may exceed 100 ppb. Typical exposure levels can cause visible foliar injury to
some plant species and have the potential to reduce tree growth by up to 10 percent per year, depending
on species and environment. As part of the Forest Service, U.S. Department of Agriculture, Forest
Inventory and Analysis (FIA) Program, ozone-induced foliar injury is evaluated in the South between
late July and mid-August on about 350 ozone biosites. For 2002 through 2006, ozone injury occurred
on between 8 (2006) and 29 percent (2003) of the sampled biosites. South Carolina had the highest
percentage of biosites with injury in 3 out of 5 years. The area at greatest risk from ozone injury occurred
in northern Georgia. Both the moisture index and the combination of ozone exposure and moisture were
significantly different for biosites where injury was observed and biosites where injury was not observed.
This evidence suggests that, despite reported declines in ambient ozone concentrations over the past 10
years, some forest areas in the South were classified in the low and no risk categories due to the moisture
deficit conditions that existed during the 2002-06 time period. The correlation between ozone injury and
moisture conditions, as well as the consistent low to moderate levels of injury, occurring year after year
in some parts of the South, warrant continued monitoring and close scrutiny for potential forest health
impacts. FIA conducts the only annual nationwide systematic survey for ozone-induced foliar injury. This
information is extremely valuable to research on trends in ozone exposure and injury and the impacts to
vegetation across the United States.
Keywords: Biomonitoring, FIA, forest health, indicator species, ozone
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Rose, Anita K.; Coulston, John W. 2009. Ozone injury across the Southern United States, 2002â06. Gen. Tech. Rep. SRSâ118. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station. 25 p.
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