Evidence of growth reduction in ozone-injured Jeffrey pine (Pinus jeffreyi Grev. and Balf. ) in Sequoia and Kings Canyon National Parks
Evidence is presented for a reduction in radial growth of Jeffrey pine in the mixed conifer forest of Sequoia and Kings Canyon National Parks, California. Mean annual radial increment of trees with symptoms of ozone injury was 11% less than trees at sites without ozone injury. Larger diameter trees (>40 cm) and older trees (>100 yr) had greater decreases in growth than smaller and younger trees. Differences in radial growth patterns of injured and uninjured trees were prominent after 1965. Winter precipitation accounted for a large proportion of the variance in growth of all trees, although ozone-stressed trees were more sensitive to interannual variation in precipitation and temperature during recent years. These results corroborates surveys in visible ozone injury to foliage and are the first evidence of forest growth reduction associated with ozone injury in North America outside the Los Angeles basin.
- Research Organization:
- Pacific Southwest Forest and Range Experiment Station, Riverside, CA
- OSTI ID:
- 5898460
- Journal Information:
- J. Air Pollut. Control Assoc.; (United States), Vol. 37:8
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
OZONE
TOXICITY
PINES
BIOLOGICAL STRESS
PLANT GROWTH
AGE DEPENDENCE
AIR POLLUTION
CALIFORNIA
NATURE RESERVES
CONIFERS
FEDERAL REGION IX
GROWTH
NORTH AMERICA
PLANTS
POLLUTION
RESOURCES
TREES
USA
560300* - Chemicals Metabolism & Toxicology