Growth, physiological and biochemical response of ponderosa pine pinus ponderosa' to ozone. Final report

Technical Report · Mon Nov 01 04:00:00 EST 1993

OSTI ID:5298535

Temple, P J; Bytnerowicz, A

In 1989 and 1990, the effects of multi-year ozone exposures on growth, foliar injury and physiological responses in ponderosa pine were examined. Two-year old seedlings were exposed to four ozone treatments in open-top chambers: clean air (subambient levels of oxidants and particles); ambient ozone; twice-ambient ozone; or ambient air. The study was performed at Shirley Meadow in the southern Sierra Nevada. In both years, ambient ozone levels were representative of other forests in the region. While ozone is the most phytotoxic air pollutant, seedlings also experienced elevated concentrations of nitric acid and ammonia. In 1990, ambient ozone significantly increased injury to previous year needles. Premature senescence and alterations in physiological responses were also noted. Exposure to twice-ambient ozone reduced seedling biomass, increased injury and caused decreases in a variety of physiological responses.

• Research Organization: California Univ., Riverside, CA (United States). Statewide Air Pollution Research Center
• OSTI ID: 5298535
• Report Number(s): PB-94-131372/XAB; CNN: ARB-A733-137; ARB-A833-083
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
090700 -- Biomass Fuels-- Resources-- (1990-)
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION
BIOCHEMISTRY
CHEMISTRY
CONIFERS
ENVIRONMENTAL IMPACTS
OZONE
PINES
PINOPHYTA
PLANTS
POLLUTION
TREES