C3 Arrhenius parameters with no temperature dependence
c3_arrhenius_no_temp.Rd
Arrhenius parameters that specify a flat temperature response (in other words,
no dependence on temperature) for important C3 photosynthetic parameters,
intended to be passed to the calculate_arrhenius
function.
Format
List with 6 named elements that each represent a variable whose temperature-dependent value can be calculated using the Arrhenius equation:
Kc
: The Michaelis-Menten constant for rubisco carboxylation.Ko
: The Michaelis-Menten constant for rubisco oxygenation.Gamma_star
: The value of CO2 partial pressure in the chloroplast at which no assimilation occurs in the absence of respiration.Vcmax_norm
: The maximum rate of rubisco carboxylation (Vcmax
) normalized to its value at 25 degrees C.J_norm
: The electron transport rate (J
) normalized to its value at 25 degrees C.RL_norm
: The respiration rate (RL
) normalized to its value at 25 degrees C.
In turn, each of these elements is a list with 3 named elements:
c
: the (dimensionless) Arrhenius scaling factor.Ea
: the activation energy inkJ / mol
.units
: the units of the corresponding variable.
Source
Some of these parameters (RL
, Vcmax
, and J
) are
normalized to their values at 25 degrees C. These variables include
_norm
in their names to indicate this.
The remaining parameters (Gamma_star
, Kc
, and Ko
) are not
normalized because they are assumed to not vary significantly between species.
Here, the activation energy values (Ea
) are all set to 0, which means
that the values will not depend on temperature. The Arrhenius scaling factors
c
are chosen to reproduce the parameter values at 25 degrees C as
specified in Sharkey et al. (2007). (See c3_arrhenius_sharkey
.)
References:
Sharkey, T. D., Bernacchi, C. J., Farquhar, G. D. & Singsaas, E. L. "Fitting photosynthetic carbon dioxide response curves for C3 leaves" Plant, Cell & Environment 30, 1035–1040 (2007) [doi:10.1111/j.1365-3040.2007.01710.x ].