Oxidant induced air pollution damage to forest trees in the southern Sierra Nevada Mountains of California

Journal Article · Wed Jan 01 04:00:00 EST 1975 · Proc. Amer. Phytopathol. Soc.; (United States)

OSTI ID:5320014

Williams, W; MacGregor, N

Numerous oxidant-injured ponderosa pines have been detected in the lower elevation forests of the southern Sierra Nevada mountain range of California. Affected pines were observed in a crescent-like band following the many ridges that rise above the Central Valley floor to 1900-2600 m elevation from Huntington Lake northeast of Fresno to the Greenhorn Mountains east of Bakersfield. Slight symptoms of ozone chlorotic mottle on ponderosa pine appeared from about 1150 m altitude, increased in severity as elevation increased, and then diminished in severity above 2600 m. An apparent east-to-west gradient of disease was observed; severity diminishing as distance from the San Joaquin Valley increased. Initial atmospheric monitoring in three forested sites suggests that ozone occurs in doses sufficient to elicit symptoms of this disease when extrapolated through the growing season from April to November. Oxidant injury on other tree species was also diagnosed including Jeffrey pine, white fir, and sugar pine.

• Research Organization: Forest Service, San Francisco, CA
• OSTI ID: 5320014
• Journal Information: Proc. Amer. Phytopathol. Soc.; (United States), Journal Name: Proc. Amer. Phytopathol. Soc.; (United States) Vol. 2; ISSN PAPSD
• Country of Publication: United States
• Language: English

Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AIR POLLUTION
AIR POLLUTION MONITORING
CALIFORNIA
CONIFERS
FEDERAL REGION IX
FORESTS
INJURIES
MONITORING
MOUNTAINS
NORTH AMERICA
OZONE
PINES
PLANTS
POLLUTION
SEASONAL VARIATIONS
SYMPTOMS
TOXICITY
TREES
USA
VARIATIONS