Optimization of C4 photosynthesis parameters (von Caemmerer model)

Usage

OpEC4photo(obsDat, iVcmax = 60, iVpmax = 120, iVpr = 80, iJmax = 400, co2 = 380, o2 = 210, level = 0.95)

Arguments

obsDat

observed assimilation data, which should be a data frame or matrix. The first column should be observed net assimilation rate (\mu mol m^{-2} s^{-1}). The second column should be the observed quantum flux (\mu mol m^{-2} s^{-1}). The third column should be observed temperature of the leaf (Celsius). The fourth column should be the observed relative humidity in proportion (e.g. 0.7).

iVcmax

initial value for Vcmax (default = 60).

iVpmax

initial value for Vpmax (default = 120).

iVpr

initial value for Vpr (default = 80).

iJmax

initial value for Jmax (default = 400).

co2

atmospheric CO2 concentration (ppm), default = 380.

o2

atmospheric O2 concentration (mmol/mol), default = 210.

level

level for the confidence intervals.

Examples

data(obsNaid)
## These data are from Naidu et al. (2003)
## in the correct format
res <- OpEC4photo(obsNaid)
## Other example using Beale, Bint and Long (1996)
data(obsBea)
resB <- OpEC4photo(obsBea)