A_supply: CO2 supply and demand function (mol / m^2 s)

In photosynthesis: Tools for Plant Ecophysiology & Modeling

CO2 supply and demand function (mol / m^2 s)

Description

This function is not intended to be called by users directly.

Usage

A_supply(C_chl, pars, unitless = FALSE, use_legacy_version = FALSE)

A_demand(C_chl, pars, unitless = FALSE)

Arguments

C_chl	Chloroplastic CO2 concentration in Pa of class units
pars	Concatenated parameters (leaf_par, enviro_par, and constants)
unitless	Logical. Should units be set? The function is faster when FALSE, but input must be in correct units or else results will be incorrect without any warning.
use_legacy_version	Logical. Should legacy model (<2.1.0) be used? See NEWS for further information. Default is FALSE.

Details

Supply function:

A = g_\mathrm{tc} (C_\mathrm{air} - C_\mathrm{chl})

Demand function:

A = (1 - \Gamma* / C_\mathrm{chl}) \mathrm{min}(W_\mathrm{carbox}, W_\mathrm{regen}, W_\mathrm{tpu}) - R_\mathrm{d}

Symbol	R	Description	Units	Default
A	A	photosynthetic rate	\mumol CO2 / (m^2 s)	calculated
g_\mathrm{tc}	g_tc	total conductance to CO2	\mumol CO2 / (m^2 s Pa)	calculated
C_\mathrm{air}	C_air	atmospheric CO2 concentration	Pa	41
C_\mathrm{chl}	C_chl	chloroplastic CO2 concentration	Pa	calculated
R_\mathrm{d}	R_d	nonphotorespiratory CO2 release	\mumol CO2 / (m^2 s)	2
\Gamma*	gamma_star	chloroplastic CO2 compensation point	Pa	3.743

Value

Value in mol / (m^2 s) of class units

Examples

bake_par = make_bakepar()
constants = make_constants(use_tealeaves = FALSE)
enviro_par = make_enviropar(use_tealeaves = FALSE)
leaf_par = make_leafpar(use_tealeaves = FALSE)
leaf_par = bake(leaf_par, enviro_par, bake_par, constants)
# Or bake with piping (need library(magrittr))
# leaf_par %<>% bake(enviro_par, bake_par, constants)
enviro_par$T_air = leaf_par$T_leaf

pars = c(leaf_par, enviro_par, constants)
C_chl = set_units(350, umol/mol)

A_supply(C_chl, pars)

A_demand(C_chl, pars)

photosynthesis documentation built on Aug. 15, 2023, 9:08 a.m.