This function is not intended to be called by users directly.
A_supply(C_chl, pars, unitless = FALSE, use_legacy_version = FALSE)
A_demand(C_chl, pars, unitless = FALSE)Chloroplastic CO2 concentration in Pa of class units
Concatenated parameters (leaf_par, enviro_par, and constants)
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.
Logical. Should legacy model (<2.1.0) be used? See NEWS for further information. Default is FALSE.
Value in mol / (m^2 s) of class units
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 | \(\mu\)mol CO2 / (m^2 s) | calculated |
| \(g_\mathrm{tc}\) | g_tc | total conductance to CO2 | \(\mu\)mol 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 | \(\mu\)mol CO2 / (m\(^2\) s) | 2 |
| \(\Gamma*\) | gamma_star | chloroplastic CO2 compensation point | Pa | 3.743 |
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)
#> 12.0831 [umol/m^2/s]
A_demand(C_chl, pars)
#> 31.28078 [umol/m^2/s]