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SEEDLING RESPONSE TO SULFUR, NITROGEN, AND ASSOCIATED POLLUTANTS
Citation:
Peterson, C., K. Mattson, AND R. Mickler. SEEDLING RESPONSE TO SULFUR, NITROGEN, AND ASSOCIATED POLLUTANTS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-89/081 (NTIS PB90148875), 1989.
Description:
In 1986, the National Acid Precipitation Assessment Program (NAPAP) established the Forest Response Program (FRP) to assess the effects of acidic deposition and associated pollutants on forests. eedling exposure studies were initiated to determine acute effects of simulated acid deposition, ozone, and sulfur dioxide, and to identify hypothesized mechanisms be which these effects might alter tree condition and hence result in forest decline. rom data available as of December 1988, altered post-exposure growth and imbalance in above- and below-ground responses to sulfur dioxide indicated changes in carbon allocation patterns. imulated acid precipitation reduced frost hardiness of red spruce seedlings at pH 3.0 and led to higher rates of foliar tissue mortality during extreme cold. oblolly pine showed root and stem growth decreases at ozone levels 80 ppb and higher. estern conifers, only ponderosa pine showed consistent growth decreases due to ozone. any treatment effects did not show up until the following growing season. he influences of different exposure methods, exposure durations, and experimental material are discussed, as are statistical considerations and quality control of treatments. Further results will be presented in a future FRP report and in NAPAP State of Science/Technology documents.
