Effects of ozone on the growth and reproduction of grasses
Conference
·
OSTI ID:5474110
Fumigation studies were undertaken to determine the effects of photochemical pollutants on the productivity and reproductive potential of gamble oak and quaking aspen, the most important watershed communities of the Wasatch Mountains of Utah. Sensitivity thresholds, based on visible injury, for a species were determined by fumigating transplanted plants with 5-35 pphm ozone for 4 hr. Once the sensitivity threshold was established, the species was fumigated consecutively for 5 days to determine the acute threshold. This was the level at which daily tissue injury occurred and was generally 3-4 pphm higher than the sensitivity threshold. To determine the effects of long-term ozone fumigation, a regime of 15-18 pphm for 1 hr, 28-33 pphm for 2 hr, and 18-20 pphm for 1 hr was followed during the life cycle fumigation of selected plants. Leaf length and number, total dry weight of plant, and weight and number of inflorescences and florets were measured as parameters of productivity and reproduction. The results indicate a potential decline in the plant populations studied can occur under conditions producing chronic injury to leaf tissue. Automotive exhaust emissions must be controlled and ozone concentrations prevented from exceeding 20 pphm.
- OSTI ID:
- 5474110
- Report Number(s):
- CONF-780504-
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ASPENS
BIOLOGICAL EFFECTS
DATA
DOSE-RESPONSE RELATIONSHIPS
ECOSYSTEMS
EXHAUST GASES
EXPERIMENTAL DATA
FEDERAL REGION VIII
FLOWERS
FLUIDS
GASEOUS WASTES
GASES
GRASS
GROWTH
INFORMATION
LEAVES
NORTH AMERICA
NUMERICAL DATA
OAKS
OZONE
PHOTOCHEMICAL OXIDANTS
PLANT GROWTH
PLANTS
PRODUCTIVITY
SENSITIVITY
TREES
USA
UTAH
WASTES
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ASPENS
BIOLOGICAL EFFECTS
DATA
DOSE-RESPONSE RELATIONSHIPS
ECOSYSTEMS
EXHAUST GASES
EXPERIMENTAL DATA
FEDERAL REGION VIII
FLOWERS
FLUIDS
GASEOUS WASTES
GASES
GRASS
GROWTH
INFORMATION
LEAVES
NORTH AMERICA
NUMERICAL DATA
OAKS
OZONE
PHOTOCHEMICAL OXIDANTS
PLANT GROWTH
PLANTS
PRODUCTIVITY
SENSITIVITY
TREES
USA
UTAH
WASTES