ftemp_kphio {rpmodel}

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)

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 pers. comm. by David Orme, correcting values provided in Cai & Prentice (2020). Corrected parametrisation is:

\phi(T) = -0.064 + 0.03 T - 0.000464 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).

Value

A numeric value for \phi(T)

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 Cai, W., and Prentice, I. C.: Recent trends in gross primary production and their drivers: analysis and modelling at flux-site and global scales, Environ. Res. Lett. 15 124050 https://doi.org/10.1088/1748-9326/abc64e, 2020

Examples

## 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 ))