PP Systems CIRAS-2 User Manual

Appendix 3. Photosynthesis Equations Used in CIRAS-2
CIRAS-2 Operator's Manual Version 2.04
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H is calculated from the photon flux incident on the cuvette (Q), taking into account the ratio of infrared to
PAR in the light source, transmission through the cuvette window (Trans), and reflection/absorption by the
leaf: (H = Q x Trans).
The following approximation is made in the program:
(3.2) From this we derive:
Step 4.0
Derive i) saturated vapor pressure at leaf temperature (e
leaf
) from T
leaf
and ii) stomatal
resistance (r
s
)
(4.1) From Reference 2:
(4.2) Stomatal resistance (to water vapor) is derived by:
(4.3) An alternative expression of Step 2.4 is:
(4.4) Because,

PP Systems CIRAS-2 Specifications

General

Brand	PP Systems
Model	CIRAS-2
Category	Measuring Instruments
Language	English