Record Display for the EPA National Library Catalog


Main Title Design and Performance of a Field Exposure System for Evaluation of the Ecological Effects of SO2 on Native Grassland.
Author Preston, Eric M. ; Lee, Jeffrey J. ;
CORP Author Corvallis Environmental Research Lab., OR.
Year Published 1981
Report Number EPA-600/J-82-221;
Stock Number PB82-261405
Additional Subjects Sulfur dioxide ; Grassland ; Air pollution ; Field tests ; Plant ecology ; Concentration(Composition) ; Micrometeorology ; Diurnal variations ; Wind velocity ; Night ; Fumigation ; Performance evaluation ; Frequency distribution ; Comparison ; Montana ; Reprints ; Point sources ; Zonal air pollution systems
Library Call Number Additional Info Location Last
NTIS  PB82-261405 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 18p
The report describes the design and performance of two replicate field exposure systems for evaluating the ecological effects of chronic SO2 exposure on 0.5 ha plots of native Montana grassland. The SO2 was supplied at a constant rate to each plot through a network of 2.5-cm inside diameter aluminum pipes set parallel to and approximately 0.7 m above the ground with 0.8-mm SO2 release holes at 3-m intervals. The resulting SO2 concentrations on the plots varied with micrometeorological conditions. Fumigations were essentially continuous from April through October for 5 yr on one set of four plots and for 4 yr on another set of four plots. Frequency distributions of SO2 concentrations were approximately log-normal and qualitatively similar to those from various area and point sources. The data from 5 years use of the system indicate that the fine-scale behavior of SO2 concentrations would be realistic.