ftemp_kphio: Calculates the temperature dependence of the quantum yield efficiency
Description
Calculates the temperature dependence of the quantum yield efficiency
following the temperature dependence of the maximum quantum yield of photosystem II
in light-adapted tobacco leaves, determined by Bernacchi et al. (2003)
Usage
ftemp_kphio(tc, c4 = FALSE)
Value
A numeric value for \(\phi(T)\)
Arguments
tc
Temperature, relevant for photosynthesis (degrees Celsius)
c4
Boolean specifying whether fitted temperature response for C4 plants
is used. Defaults to FALSE (C3 photoynthesis temperature resposne following
Bernacchi et al., 2003 is used).
Details
The temperature factor for C3 photosynthesis (argument c4 = FALSE) is calculated
based on Bernacchi et al. (2003) as
$$
\phi(T) = 0.352 + 0.022 T - 0.00034 T^2
$$
The temperature factor for C4 (argument c4 = TRUE) photosynthesis is calculated based on
unpublished work as
$$
\phi(T) = -0.008 + 0.00375 T - 0.58e-4 T^2
$$
The factor \(\phi(T)\) is to be multiplied with leaf absorptance and the fraction
of absorbed light that reaches photosystem II. In the P-model these additional factors
are lumped into a single apparent quantum yield efficiency parameter (argument kphio
to function rpmodel).
References
Bernacchi, C. J., Pimentel, C., and Long, S. P.: In vivo temperature
response func-tions of parameters required to model RuBP-limited
photosynthesis, Plant Cell Environ., 26, 1419–1430, 2003
## Relative change in the quantum yield efficiency## between 5 and 25 degrees celsius (percent change):print(paste((ftemp_kphio(25.0)/ftemp_kphio(5.0)-1)*100 ))