Temperature dependence of Jmax and Vcmax

Retrieve the reference temperature value of a parameter knowing its value at Tleaf

f.modified.arrhenius.inv(P, Ha, Hd, s, Tleaf, TRef = 298.16, R = 8.314)

Arguments

P

Value of the parameter, here Vcmax or Jmax, at the leaf temperature in micromol.m-2.s-1

Ha

Energy of activation in J.mol-1.

Hd

Energy of desactivation in J.mol-1.

s

Entropy term in J.mol-1.K-1.

Tleaf

Temperature of the leaf in Kelvin.

TRef

Reference temperature in Kelvin, usually 25 + 273.16 K.

R

Ideal gas constant.

Value

Value of the parameter Jmax or Vcmax at the reference temperature

Examples

VcmaxTleaf=f.modified.arrhenius(PRef=50,Ha=73637,Hd=149252,s=486,Tleaf=seq(273.15+25,273.15+35,0.1))
f.modified.arrhenius.inv(P=VcmaxTleaf,Ha=73637,Hd=149252,s=486,Tleaf=seq(273.15+25,273.15+35,0.1))
#>   [1] 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50
#>  [26] 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50
#>  [51] 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50
#>  [76] 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50
#> [101] 50