c3_temperature_param_bernacchi {PhotoGEA}R Documentation

C3 temperature response parameters from Bernacchi et al.

Description

Parameters describing the temperature response of important C3 photosynthetic parameters, intended to be passed to the calculate_temperature_response function.

Usage

c3_temperature_param_bernacchi

Format

List with 12 named elements that each represent a variable whose temperature-dependent value can be calculated using an Arrhenius equation, Johnson-Eyring-Williams equation, or a polynomial equation:

In turn, each of these elements is a list with at least 2 named elements:

Source

Many of these parameters are normalized to their values at 25 degrees C. Vomax is normalized to the value of Vcmax at 25 degrees C. These variables include _norm in their names to indicate this.

Arrhenius parameters for J were obtained from Bernacchi et al. (2003). Here, we use the values determined from chlorophyll fluorescence measured from plants grown at 25 degrees C (Table 1). Although Bernacchi et al. (2003) reports values of Jmax, here we assume that both Jmax and the light-dependent values of J follow the same temperature response function and refer to it as J for compatibility with c3_temperature_param_sharkey.

Johnson-Eyring-Williams parameters for gmc were obtained from Bernacchi et al. (2002).

The Bernacchi papers from the early 2000s do not specify a temperature response for Tp, so we instead use the Johnson-Eyring-Williams response from Sharkey et al. (2007). Another option would be to use a flat temperature response; in other words, to assume that Tp is constant with temperature. This could be done with the following code, which takes the flat response parameters from c3_temperature_param_flat: within(c3_temperature_param_bernacchi, {Tp_norm = c3_temperature_param_flat$Tp_norm})

The Arrhenius parameters for the other variables were obtained from Bernacchi et al. (2001).

References:


[Package PhotoGEA version 1.3.3 Index]