J: J: Rate of electron transport (umol/m^2/s)

View source: R/FvCB.R

JR Documentation

J: Rate of electron transport (umol/m^2/s)

Description

Calculate the rate of electron transport as a function of photosynthetic photon flux density (PPFD).

Usage

J(pars, unitless = FALSE)

Arguments

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.

Details

J as a function of PPFD is the solution to the quadratic expression:

0 = \theta_J J ^ 2 - J (J_\mathrm{max} + \phi_J PPFD) + J_\mathrm{max} \phi_J PPFD

Symbol R Description Units Default
J_\mathrm{max} J_max potential electron transport (T_leaf) \mumol CO2 / (m^2 s) calculated
\phi_J phi_J initial slope of the response of J to PPFD none 0.331
PPFD PPFD photosynthetic photon flux density \mumol quanta / (m^2 s) 1500
\theta_J theta_J curvature factor for light-response curve none 0.825

Value

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

Examples


library(magrittr)
library(photosynthesis)

bake_par = make_bakepar()
constants = make_constants(use_tealeaves = FALSE)
enviro_par = make_enviropar(use_tealeaves = FALSE)
leaf_par = make_leafpar(use_tealeaves = FALSE)
enviro_par$T_air = leaf_par$T_leaf
leaf_par %<>% bake(enviro_par, bake_par, constants)

pars = c(leaf_par, enviro_par, constants)
J(pars, FALSE)

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