OLS : Record


Main Title Analysis of Crop Loss for Alternative Ozone Exposure Indices.
Author Tingey, D. T.; Hogsett, W. E.; Lee, E. H.;
CORP Author Corvallis Environmental Research Lab., OR. ;Northrop Services, Inc., Corvallis, OR.
Year Published 1988
Report Number EPA/600/D-88/118;
Stock Number PB88-214788
Subjects Ozone; Air pollution; Farm crops; Plant growth; Mathematical models; Exposure; Concentration(Composition); Response; Seasonal variations; Plant physiology; Air pollution effects(Plants)
Library   Call Number Additional Info Location Date Modified
NTIS PB88-214788 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 12/29/1988
Collation 15p
Abstract Defining the appropriate exposure index that 'best' relates plant response to exposure necessitates a consideration of the underlying biological basis for the response and a method for characterizing the temporal variations in pollutant occurrence. Although no single index was deemed 'best' (in all cases) for relating O(3) exposure to plant response, the top-performing exposure indices were those that (1) cumulate the hourly O(3) concentrations over time, (2) emphasize concentrations of 0.06 ppm and higher either by continuous sigmoid weights or by discrete (0 or 1) weights of the threshold indices. The 'best' index gave greater weight to exposures occurring 20 to 40 days before harvest. When assessing the impact of O(3) on plant growth, these findings illustrate the importance of exposure duration, the importance of repeated peaks, and the time of increased plant sensitivity.
Supplementary Notes See also PB86-121548. Prepared in cooperation with Northrop Services, Inc., Corvallis, OR.
NTIS Title Notes Symposium paper.
PUB Date Free Form May 88
Category Codes 68A; 98D
NTIS Prices PC A03/MF A01
Primary Description 600/02
Document Type NT
Control Number 824517982
Cataloging Source NTIS/MT
Origin NTIS
Type CAT