TARGAS-1 Operation Manual V. 1.02 152 support@ppsystems.com
= ×
Where = 0.14 the ratio of infrared to visible radiation, and converting photon flux to energy units
To simply computation, the following approximation is made:
×
(
+ )
. +
(
. ×
)
(A.7) Then, the leaf temperature is:
=
(
+
)
Saturation Vapor Pressure
Derive saturation vapor pressure at leaf temperature (
) from
(A.8) From Buck, 1981 (using e
w1
and f
w1
) we calculate:
= . ×
×
(
.
)
+ .
Where
= saturated water vapor pressure inside leaf at
Stomatal Conductance
Calculate stomatal conductance (g
s
)
(A.9) From von Caemmerer & Farquhar, 1981 (Eq B14), total leaf conductance to H
2
O transfer is
calculated as:
=
×
(
+
)/
(A.10) Since 1/
=
+
,
(A.11) stomatal resistance can be calculated as:
=
× ((
+
)/)
(A.12) Stomatal conductance is the inverse of stomatal resistance:
=
×
Net Photosynthesis
Determine the rate of net photosynthesis () from the difference between CO
2
concentrations entering
(C
in
) and exiting (C
out
) the cuvette
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