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Abstract
We examined the short-term separate and combined effects of simulated nitrogen (N) deposition (fertilization) and ozone (O
3) exposure on California black oak seedlings (
Quercus kelloggii Newb.), an ecologically important tree of the San Bernardino Mountains downwind of Los Angeles. Realistic concentrations of O
3 were found to cause statistically and biologically significant negative effects on plant health, including lowered photosynthetic ability, lowered water use efficiency, and increased leaf chlorosis and necrosis. When subjected to abrupt changes in light levels, O
3-exposed plants showed both a slower and smaller response than O
3-free plants. Fertilized plants exhibited a significantly greater preto post-treatment decline in A at saturated [CO
2] and a significantly lower level of post-treatment chlorosis than unfertilized plants. Fertilization tended to reduce plant sensitivity to O
3.
Citation
Handley, T.; Grulke, N.E. 2008.Interactive effects of O
3 exposure on California black oak (Quercus kelloggii Newb.) seedlings with and without N amendment. Environmental Pollution. 156(1): 53-60. https://doi.org/10.1016/j.envpol.2008.01.002.
