NGCRP Contribution to the Project
Diurnal measurements of carbon assimilation and respiration of
leaves and stems using an automated multiple chamber system
The Aspen FACE experiment consists of twelve 30m rings in which
the concentrations of carbon dioxide and tropospheric ozone can
be controlled. The design provides the ability to assess the effects
of these gases alone and in combination on many ecosystem attributes.
An automated, temperature and CO2 controlled, multiple
cuvette photosynthetic system was adapted to measure daily carbon
sums for leaves and stems within a treatment ring. The system has
been adapted to track ambient temperature conditions and to provide
elevated CO2 levels to the chambers to work in all the
The continuous photosynthesis and respiration measurements under
ambient conditions, will contribute to the suite of physiological
parameters that are being measured at the Rhinelander FACE site.
Continuous improvements to the system include greater portability
and specialized scaffolding for canopy access.
Diurnal Measurements of Carbon Assimilation and Respiration of Leaves
and Stems Using an Automated Multiple Chamber System (.pdf)
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