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SENSITIVITY OF IMPORTANT WESTERN CONIFER SPECIES TO SO2 AND SEASONAL INTERACTION OF ACID FOG AND OZONE
Citation:
Hogsett, W., D. Tingey, C. Hendricks, AND D. Rossi. SENSITIVITY OF IMPORTANT WESTERN CONIFER SPECIES TO SO2 AND SEASONAL INTERACTION OF ACID FOG AND OZONE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-89/111 (NTIS PB90113150), 1989.
Description:
The increased concern for forest health and the role of anthropogenic deposition, including acidic/wet deposition and gaseous air pollutants, has led to the need to understand which forest species face the highest risk from atmospheric deposition. n order to address this issue for the Western U.S., a number of important western conifer species have been assessed with regard to seedling growth response to each of three different deposition scenarios likely to occur in the Western U.S. he exposure scenarios include (1) acid fog (fall-winter)/ozone (summer) in a seasonal interaction of each pollutant over the year, (2) acid fog only in fall-winter exposure, or (3) SO2 gaseous pollutant over the fall and winter months. easonal occurrence of the pollutants, rather than concurrent pollutant combinations represent a realistic exposure scenario for much of the climatic conditions of the coastal Western U.S., and the Cascade and Sierra foothills. he fumigation regimes reflect the seasonality of deposition duration, frequency of events, and chemistry for fog; and the seasonality of the frequency and distribution parameters of selected regions of the West. he fumigation periods are those months when these occur primarily. Five species were selected for study based on economic and ecological importance in the West. hese included Douglas-fir, ponderosa pine, lodgepole pine, western hemlock, and western redcedar. ouglas-fir and ponderosa pine were screened at both ERL-C and the Forest Service Fire Lab at Riverside, California. tudy similar to the one reported here has also been conducted at Riverside under the direction of Dr. Paul Miller. Seedling sensitivity was assessed as a growth response over two growing seasons, including the spring following the previous year's pollutant exposure. The various responses to, the exposure scenarios for the first year's study are reported here. he study was repeated a second year, and these results are briefly discussed.