Water relations of coniferous tree species subjected to ozone in the San Bernadino Mountains, Southern California
Species differences in sensitivity to ozone damage in the vegetation of the San Bernadino Mountains in southern California are discussed. Pinus ponderosa and P. Jeffreyi are affected while P. Coulteri, P. Lambertiana, Lebocedrus decurrans and chaparral species appear resistant. The San Bernadino Mountains are located east of the Los Angeles basin and are generally above the smog layer, but by late afternoon the inversion rises and smog moves east so that ozone levels in the mountains increase. Ozone levels are especially high in summer. The ozone enters the leaf by diffusing through the stomates, thus the susceptibility should be related in part to diurnal and seasonal patterns of stomatal activity. The hypothesis that the ozone sensitivity of coniferous tree species in the San Bernadino Mountains is related to the plant water relations controlling diurnal patterns of stomatal behavior through the year was investigated and results are reported.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48; PO-4974403
- OSTI ID:
- 7212801
- Report Number(s):
- UCRL-13729
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
CONIFERS
GENETIC VARIABILITY
OZONE
ENVIRONMENTAL TRANSPORT
FOLIAR UPTAKE
TOXICITY
BIOLOGICAL EFFECTS
CALIFORNIA
DAILY VARIATIONS
MOUNTAINS
SEASONAL VARIATIONS
TERRESTRIAL ECOSYSTEMS
TISSUE DISTRIBUTION
TRANSPIRATION
TREES
WATER
BIOLOGICAL VARIABILITY
BIOMASS
DISTRIBUTION
ECOSYSTEMS
ENERGY SOURCES
HYDROGEN COMPOUNDS
MASS TRANSFER
NORTH AMERICA
OXYGEN COMPOUNDS
PLANTS
RENEWABLE ENERGY SOURCES
UPTAKE
USA
VARIATIONS
WESTERN REGION
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)
510200 - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)