Effects of ozone on photosynthesis, vegetative growth, and development of woody perennials in the San Joaquin Valley of California. Final report

Technical Report · Tue Oct 31 04:00:00 EST 1989

OSTI ID:6138658

Williams, L E; DeJong, T M; Retzlaff, W A

Nursery stock of nine fruit and nut tree species were planted in open-top chambers on April 1, 1988 at the University of California's Kearney Agricultural Center located in the San Joaquin Valley. The trees were then exposed to three levels of atmospheric ozone partial pressures (charcoal filtered air, ambient air, or ambient air + ozone) from 1 August to 17 November 1988. The relationship between leaf net CO2 assimilation rate and 12-hour mean ozone partial pressure decreased linearly with increasing ozone partial pressure for the almond, plum, apricot, pear and apple cultivars. Stomatal conductances of apricot, prune, apple, almond, and plum also decreased linearly with increasing ozone partial pressure. Cross-sectional area relative growth rates of almond, plum, apricot, pear and apple declined linearly with increasing ozone partial pressure. Net CO2 assimilation rate, stomatal conductance, and trunk growth of cherry, peach, and nectarine were unaffected by the ozone treatments. The results indicate that decreases in leaf gas exchange were probably contributors to decreases in young tree growth of the susceptible species/cultivars.

• Research Organization: California Univ., Davis, CA (United States)
• OSTI ID: 6138658
• Report Number(s): PB-91-241968/XAB; CNN: ARB-A733126
• Country of Publication: United States
• Language: English

Related Subjects

560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AIR POLLUTION
BIOLOGICAL EFFECTS
CALIFORNIA
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DEVELOPED COUNTRIES
EXPOSURE CHAMBERS
FEDERAL REGION IX
FOOD
FRUIT TREES
FRUITS
GROWTH
NORTH AMERICA
NUTS
OPENINGS
OXIDES
OXYGEN COMPOUNDS
OZONE
PARTIAL PRESSURE
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANT GROWTH
PLANTS
POLLUTION
STOMATA
SYNTHESIS
TREES
USA