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Multiple TREGRO simulations were conducted with meteorological data files containing different growing season peak ozone (O(3)) episodes at O(3) exposures of 1.0 and 2.0 x ambient O(3) to assess the relationship between O(3) response and the phenology of mature yellow poplar (Liriodendron tulipifera L.) and loblolly pine (Pinus taeda L.) trees. Regardless of O(3) exposure and peak O(3) episode occurrence, a peak O(3) episode in August caused the greatest reduction in carbon (C) gain in yellow poplar, whereas a peak O(3) episode in July caused the greatest reduction in C gain of loblolly pine. In both species, timing of the greatest simulated O(3) effect corresponded with the completion of the annual foliage production phenophase. Simulated C gain of yellow poplar (total tree, coarse root, and total nonstructural carbohydrate) was reduced by O(3) to a greater extent than the corresponding compartments in loblolly pine, but the opposite was true for fine roots. This differential sensitivity to O(3) reflects the fact that both C assimilation and the O(3) response of the species were parameterized according to observed field measurements of each species. The differential sensitivity to O(3) of these species may have long-term implications for species composition in southeastern USA forests.

tree physiology

Simulating the response of mature yellow poplar and loblolly pine trees to shifts in peak ozone periods during the growing season using the TREGRO model