3. Requirements and constraints for the new SBGS
network
The original sites were intended to monitor crown injury
and tree diameter changes due to the effects of ozone. Future
uses of this network of sites will focus on multiple pollutant
effects, and interactions between pollutants and other biotic
and abiotic stressors that affect forest health. In addition, the
new network needs to be less oriented along a single
pollutant gradient and more towards enabling the construction
of spatially explicit surfaces of ambient pollutant
concentrations, stand growth, species composition, and
biogeochemistry.
While the information from the more recently established
sites (those established between 1988 and 1998) is important,
older sites have a temporal record that is rare in air
pollution research. The study site design and experimental
treatments of newer sites also differ enough to reduce
comparability of results with the older sites. Therefore, the
original 18 SBGS sites were used as the foundation for the
new spatial gradient system.
3. Requirements and constraints for the new SBGS
network
The original sites were intended to monitor crown injury
and tree diameter changes due to the effects of ozone. Future
uses of this network of sites will focus on multiple pollutant
effects, and interactions between pollutants and other biotic
and abiotic stressors that affect forest health. In addition, the
new network needs to be less oriented along a single
pollutant gradient and more towards enabling the construction
of spatially explicit surfaces of ambient pollutant
concentrations, stand growth, species composition, and
biogeochemistry.
While the information from the more recently established
sites (those established between 1988 and 1998) is important,
older sites have a temporal record that is rare in air
pollution research. The study site design and experimental
treatments of newer sites also differ enough to reduce
comparability of results with the older sites. Therefore, the
original 18 SBGS sites were used as the foundation for the
new spatial gradient system.
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