Ozone causes needle injury and tree decline in Pinus hartwegii at high altitudes in the mountains around Mexico City
Needles of P. hartwegii were examined for a two-year period at 22 plots at Ajusco, D.F., south of Mexico City, at 3000 m. Ozone injury symptoms, consisting of extensive yellow banding and mottling, were observed on mature needles. These also became evident on new needles as they matured. This resulted in premature needle loss, reduction in cone and seed production, loss of tree vigor, bark beetle infestations, and tree decline and death. P. montezumae var. lindleyi and a few P. hartwegii trees in the same area were less susceptible. The most severe ozone injury to P. hartwegii occurs west to southwest of Mexico City in the mountain forest reserve of Desierto de los Leones, at 3500 m. Based on observations, the authors feel that needle injury and decline of P. hartwegii at high elevations in the mountains around Mexico City is caused primarily by ozone and not acid rain. It resembles the ozone-caused decline of ponderosa pine in the San Bernardino Mountains in California.
- Research Organization:
- Centro de Fitopatologia, Monticillos, MX
- OSTI ID:
- 5018416
- Journal Information:
- J. Air Pollut. Control Assoc.; (United States), Vol. 35:8
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
OZONE
BIOLOGICAL EFFECTS
ACID RAIN
CALIFORNIA
COMPARATIVE EVALUATIONS
DAMAGE
INJURIES
INSECTS
MEXICO
PINES
PLANT DISEASES
SAN BERNARDINO MOUNTAINS
URBAN AREAS
ANIMALS
ARTHROPODS
ATMOSPHERIC PRECIPITATIONS
CONIFERS
DEVELOPING COUNTRIES
FEDERAL REGION IX
INVERTEBRATES
LATIN AMERICA
MOUNTAINS
NORTH AMERICA
PLANTS
RAIN
TREES
USA
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)