Interactive effects of O3 exposure on California black oak (Quercus kelloggii Newb.) seedlings with and without N amendment.

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 pre- to 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).

• Authors: T Handley, N E Grulke
• Journal: Environmental pollution (Barking, Essex : 1987) (Environ Pollut) Vol. 156 Issue 1 Pg. 53-60 (Nov 2008) ISSN: 1873-6424 [Electronic] England
• PMID: 18313184 (Publication Type: Journal Article)

Chemical References

• Fertilizers
• Oxidants, Photochemical
• Ozone
• Nitrogen

Topics

• Fertilizers
• Necrosis (chemically induced)
• Nitrogen (pharmacology)
• Oxidants, Photochemical (pharmacology)
• Ozone (pharmacology)
• Photosynthesis (drug effects)
• Plant Leaves (drug effects)
• Plant Transpiration (drug effects)
• Quercus (drug effects, physiology)
• Seedlings (drug effects, physiology)
• Sunlight