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
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB82-207135 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
50p |
Abstract |
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. |