3.2 | Stand canopy conductance
Stand conductance, \(g_{C\hat{\alpha}},\ \) is an important component of
the estimation of GPPiso/SF. Stand conductance showed
strong seasonal trends with no difference between the F and the R plot
(Figure 2). \(g_{C\hat{\alpha}}\), started to increase in both plots on
March 12th in 2012 and on April 14thin 2013. The difference was due to due to low temperatures in March 2013
compared to 2012. The winter and fall periods rarely showed any positive
conductance because the VPD and \(\hat{\alpha}\) corrections filters
forced the values to zero. The rates were highest from early June until
the beginning of September, which is the core of the thermal growing
season. During this period the
ratio\(\hat{\alpha}\)/\({\hat{\alpha}}_{\max}\) was close to 1 (Figure S3)
meaning that photosynthetic capacity had reached its seasonal maximum
(Mäkelä et al., 2008). Conductance fell through September and October,
returning to zero in both plots on the 25th of October
in 2012 and the 4th of December in 2013 (Figure 2).