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SIMULATION OF OZONE EFFECTS ON EIGHT TREE SPECIES AT SHENANDOAH NATIONAL PARK
Citation:
Laurence, J A., E H. Lee, AND W E. Hogsett. SIMULATION OF OZONE EFFECTS ON EIGHT TREE SPECIES AT SHENANDOAH NATIONAL PARK. Presented at Ecological Society of America 2001 Annual Meeting, Madison, WI, August 5-10, 2001.
Description:
As part of an assessment of potential effects of air pollutants on the vegetation of Shenandoah National Park (SHEN), we simulated the growth of eight important tree species using TREGRO, a mechanistic model of individual tree growth. Published TREGRO parameters for black cherry, red maple, red oak, sugar maple, and yellow poplar were adjusted to account for meteorology and phenology at SHEN. Parameters for basswood, chestnut oak, and white ash were developed, based on literature reports of physiology and growth. Ozone response functions were based on reports from the literature, when available, or estimated by comparison of stomatal conductance with similar species with a known response to ozone. Simulations were for 1997-1999. Ozone scenarios were constructed based on measured ambient ozone at SHEN and included a rollback of 20 percent and increase of 10, 30, and 50 percent in hourly concentrations (about 50 to 450 ppm.hr SUM06 over 3 years). Predicted changes in total growth due to ozone ranged from almost 0 percent in sugar maple to about ?2.75 percent over the 3 year simulation in white ash. In all cases, the greatest effects on growth were simulated in roots, similar to responses reported in the literature. For the final assessment, these results will be incorporated into ZELIG parameters to simulate the potential effects of ozone on growth under competition and subsequent stand composition and productivity.