Record Display for the EPA National Library Catalog


Main Title Measurment of Loblolly Pine Terpene Emissions
Author Seila, R. L. ; Arnts, R. R. ; Kuntz, R. L. ; Mowry, F. L. ; Knoerr, K. R. ;
CORP Author Environmental Sciences Research Lab., Research Triangle Park, NC.
Year Published 1982
Report Number EPA-600/3-82-010;
Stock Number PB82-207135
Additional Subjects Pine trees ; Hydrocarbons ; Air pollution ; Monitoring ; Photochemistry ; Ozone ; Gas chromatography ; Comparison ; Biological processes ; Energy balance ; Bowen ratio balance ; Volatile organic compounds ; Numerical solution
Library Call Number Additional Info Location Last
NTIS  PB82-207135 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 50p
A new method for quantifying biogenic hydrocarbon emission rates without disturbing the vegetation is presented. An energy balance/Bowen ratio approach was used to estimate fluxes of alpha-pinene from measurements of net radiation and vertical gradients of alpha-pinene, temperature, and water vapor above the forest canopy. The mean flux for 20 determinations ranging from 19 to 84 micrograms/sq m/min was 41 micrograms/sq m/min. This method was compared to an enclosure method, in which foliage is enclosed with a Teflon bag for emission rate determinations. For this comparison the energy balance/Bowen ratio flux values were converted to emission rate units of micrograms alpha-pinene per gram dry needle mass per hour using site specific biomass factors. Seventeen enclosure method determinations from mature loblolly pine trees yielded a median value of 4.7 micrograms/g/h over a range of 1.2 to 32 micrograms/g/h. While both methods displayed relatively high variances, the variance of the enclosure method was considerably higher than that of the energy balance/Bowen ratio method. There was no statistically significant difference of results between the two methods.