CIRAS-3 Operation Manual V. 1.09 161 support@ppsystems.com
The following approximation is made:
×
(
+ )
. +
(
. ×
)
(3.2) From this we derive:
=
(
+
)
Saturation Vapor Pressure
Derive saturation vapor pressure at leaf temperature (e
leaf
) from T
leaf
(4.1) From Buck, 1981 (using e
w1
and f
w1
) we calculate:
= . ×
×
(
.
)
+ .
Stomatal Conductance
Calculate stomatal conductance (g
s
)
(4.2) From Caemmerer & Farquhar, 1981 (Eq B14), total leaf conductance is calculated as:
=
×
(
+
)/
(4.3) Since 1/
=
+
,
(4.4) stomatal resistance can be calculated as:
=
× ( (
+
)/)
(4.5) Stomatal conductance is the inverse of stomatal resistance:
=
×
Net Photosynthesis
Determine the rate of net photosynthesis (A) from the difference between CO
2
concentrations entering
(C
in
) and exiting (C
out
) the cuvette
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