Modeling ozone bioindicator injury with microscale and landscape-scale explanatory variables: A logistic regression approachThis article is part of a larger document. View the larger document here.
Tropospheric ozone occurs at phytotoxic levels in the United States (Lefohn and Pinkerton 1988). Several plant species, including commercially important timber species, are sensitive to elevated ozone levels. Exposure to elevated ozone can cause growth reduction and foliar injury and make trees more susceptible to secondary stressors such as insects and pathogens (Chappelka and Samuelson 1998). In response to this threat, the Forest Service, U.S. Department of Agriculture, maintains a national ozone biomonitoring program.