Relating ambient ozone concentrations to adverse biomass responses of white clover: A case study
- Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Dept. of Plant Pathology, Physiology and Weed Science
- ARS, Raleigh, NC (United States). Dept. of Plant Pathology
- Univ. of Massachusetts, Amherst, MA (United States). Dept. of Microbiology
- Univ. of Minnesota, St. Paul, MN (United States)
A white clover model system (consisting of O{sub 3} sensitive, NC-S and tolerant, NC-R clones) offers an opportunity to establish cause (temporally dynamic O{sub 3} exposures) and effect (temporally variable, chronic plant biomass responses) relationships under chamberless, ambient conditions on a regional scale. However, the understanding of the performance of the system (ambient O{sub 3} exposures and the responses of NC-S:NC-R) requires improvement. For example, there are residual carry-over effects in the biomass responses of NC-S:NC-R between successive harvests in a given growth season. However, there were no clear increasing or decreasing trends in these ratios from harvest to harvest during a given growth season. Based on observed differential, perhaps random variations in the biomass responses of NC-S:NC-R, one may conclude that growth regulating factors other than the ambient O{sub 3} were responsible for the observed variability. This is supported by the results of the linear regression analysis between the O{sub 3} exposure potentials (O{sub 3} flux) and the biomass responses of NC-S:NC-R. Future research must include not only site specific measurements of ambient O{sub 3} concentrations and the biomass responses of NC-S and NC-R, but also hourly horizontal windspeeds, air temperature, global radiation and relative humidity to derive more realistic and reliable numerical relationships of cause (O{sub 3} fluxes) and effect (NC-S:NC-R biomass). The resulting predictive models need to be of time series in their nature to account for the stochasticity of the underlying relationships.
- OSTI ID:
- 679352
- Report Number(s):
- CONF-980632-; TRN: IM9940%%171
- Resource Relation:
- Conference: 91. annual meeting and exhibition of the Air and Waste Management Association, San Diego, CA (United States), 14-18 Jun 1998; Other Information: PBD: 1998; Related Information: Is Part Of Proceedings of the 91. annual meeting and exhibition. Bridging international boundaries: Clean production for environmental stewardship; PB: [5000] p.
- Country of Publication:
- United States
- Language:
- English
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