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- W2057653756 abstract "The reflectance spectra of three conifer species, Douglas fir, lodgepole pine and ponderosa pine, show clear changes in response to simulated ambient ozone (O3) exposures in open top chambers after one growing season. Ponderosa pine seedlings had slight symptoms of needle mottle-chlorosis associated with O3 injury and showed the greatest magnitude of spectral changes; lodgepole pine exhibited an intermediate spectral response following trends similar to those in ponderosa pine; Douglas fir showed no spectral or visible response to the O3 exposures. These results suggest that despite species-specific responses to O3 exposure, the pattern of spectral changes is similar. Reflectance patterns change across the visible and infrared spectrum, however, the greatest changes occurred in the region of chlorophyll absorbance (600–725 nm) and are indicative of chlorosis. Scheffe values are significant (P 0.90) for treatment differences in ponderosa pine at all wavebands in the 475–740 nm region. Reflectance spectroscopy provides a mechanism for rapid quantitative non-destructive estimation of environmental stress and may be linked to carbon balance or other ecosystem models. Simulation models of spectral mixtures typical of many environmental conditions indicate that early stages of O3-induced injury to the ecosystem could be identified with a high spectral and spectral resolution satellite scanner, such as the proposed Eos imaging spectrometer, HIRIS." @default.
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- W2057653756 date "1990-07-01" @default.
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- W2057653756 title "Spectral characteristics of ozone-treated conifers" @default.
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- W2057653756 doi "https://doi.org/10.1016/0098-8472(90)90041-2" @default.
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