Effect of ozone on photosynthesis, vegetative growth and productivity of prunus salicina in the San Joaquin Valley of California. Final report
In 1988, an experimental orchard of Cassleman plum (Prunus salicina) was planted in open top fumigation chambers and exposed for 4 growing seasons to three ozone concentrations near Fresno, California. During the two years from orchard establishment to the first fruit bearing stage, mean 12-h ozone levels (1989) were 0.044 ppm in the charcoal filtered chambers, 0.059 ppm in the ambient air chambers, 0.111 ppm in the ambient plus added ozone chambers and 0.064 ppm in the no-chamber field plots. The 1990 ozone levels were 0.038 ppm, 0.050 ppm, 0.090 ppm, and 0.050 ppm, respectively. Chronic ozone stress has a detrimental effect on leaf appearance and retention, trunk growth, and yield during the orchard establishment period. Fruit production was 28 percent lower in the ambient exposures and 38 percent lower in the twice ambient exposures, compared to trees grown in filtered air chambers. Photosynthesis was reduced 11 percent and 40 percent respectively. Premature leaf drop occurred at mean daily ozone concentrations greater than 0.09 ppm (the California Ambient Air Quality Standard) and had an adverse impact on trunk growth.
- Research Organization:
- California Univ., Davis, CA (United States)
- OSTI ID:
- 6917804
- Report Number(s):
- PB-95-103867/XAB; CNN: ARB-A933-145
- Country of Publication:
- United States
- Language:
- English
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ENVIRONMENTAL EFFECTS
FIELD TESTS
GROWTH
OZONE
PLANT GROWTH
TESTING