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This volume presents a body of research conducted over more than
thirty years, including an intensive interdisciplinary five-year
study begun in 1991. Chapters include studies of the relationships
of biogeography and climate to the region's air pollution, the
chemical and physiological mechanisms of ozone injury, as well as
the impacts of nitrogen-containing pollutants and natural stresses
on polluted forests.
During late 1985, the Research Management Committee (RMC) of the
National Crop Loss Assessment Network (NCLAN) decided the most ap
propriate way to bring the NCLAN program to a successful conclusion
was to hold an international conference. It was envisaged as an
opportunity to present an overview of results from the NCLAN
program and as a chance to view the results in the context of
ongoing research by members of the international community. *
Although we wanted the Conference to have an assessment
orientation, it was also intended for the Conference to focus on
current state-of-knowledge. The Conference was designed to overview
the needs of crop loss assessment, current approaches to
assessment, progress in the development of predictive models, the
use of the information for economic predictions, and the
application of the data in policy decisions. Every effort was made
to assure a broad representation of ideas. The Conference program
was developed to evaluate major issues that address
regional/national assessments of impacts of atmospheric pollutants
on agricultural production. Sessions were structured to address
specific issues by invited speakers, and by contributed papers and
posters. First, background needs for doing loss assessment research
including specific approaches and a rather detailed review of the
NCLAN program were addressed (Session I). Session II addressed the
needs for defining the exposure environment (e. g. extrapolating to
regional concentrations and exposure characterization). Field
approaches for determining crop loss were reviewed in Session III."
Since the 1950s, the pines native to the San Bernardino Mountains
in Southern California have shown symptoms of decline that have
proven to result from exposure to ozone, a major plant-damaging gas
in photochemical oxidant air pollution. Because of their proximity
to major urban areas, the San Bernardino Mountains have served as a
natural laboratory for studying effects of oxidant and acidic air
pollution on a mixed-conifer forest. This volume presents a body of
research conducted over more than thirty years, including an
intensive interdisciplinary five-year study begun in 1991. Chapters
include studies of the relationships of biogeography and climate to
the region's air pollution, the chemical and physiological
mechanisms of ozone injury, as well as the impacts of
nitrogen-containing pollutants and natural stresses on polluted
forests. The synthesis of such long-term studies provides insights
into the combined influences of pollutants on ecosystem function in
forested regions with Mediterranean-type climates.
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