J: Rate of electron transport (umol/m^2/s)
Calculate the rate of electron transport as a function of photosynthetic photon flux density (PPFD).
J(pars, unitless = FALSE)
pars |
Concatenated parameters ( |
unitless |
Logical. Should |
J as a function of PPFD is the solution to the quadratic expression:
0 = θ_J J ^ 2 - J (J_max + φ_J PPFD) + J_max φ_J PPFD
| Symbol | R | Description | Units | Default |
| J_max | J_max |
potential electron transport (T_leaf) | μmol CO2 / (m^2 s) | calculated |
| φ_J | phi_J |
initial slope of the response of J to PPFD | none | 0.331 |
| PPFD | PPFD |
photosynthetic photon flux density | μmol quanta / (m^2 s) | 1500 |
| θ_J | theta_J |
curvature factor for light-response curve | none | 0.825 |
Value in μmol/ (m^2 s) of class units
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(bake_par, constants) pars <- c(leaf_par, enviro_par, constants) J(pars, FALSE)
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.