Ca |
380 |
μmol mol–1
|
CO2 concentration in the ambient air |
cp |
29.3 a
|
J
mol–1 K–1
|
Heat capacity of
air |
DH20 |
2.14×10-5 a
|
m2 s–1
|
Diffusion coefficient of
heat at 20°C |
Dν20 |
2.40×10-5 a
|
m2 s–1
|
Diffusion coefficient of
water vapor at 20°C |
Dc20 |
1.57×10-5 a
|
m2 s–1
|
Diffusion coefficient of
CO2 at 20°C |
D0 |
1.5b
|
kPa |
Empirical
parameter in the stomatal‐conductance model |
HKc |
79430 c
|
J
mol–1
|
Activation energy for
Kc
|
HKo |
36380 c
|
J
mol–1
|
Activation energy for
Ko
|
HΓ* |
37830 c
|
J
mol–1
|
Activation energy for
Γ*
|
Hd |
200000 d
|
J
mol–1
|
Deactivation energy |
Kc25 |
404.9 c
|
μmol
mol–1
|
Michaelis‐Menten constant of Rubisco activity
for CO2 at 25°C |
Ko25 |
278.4 c
|
mmol
mol–1
|
Michaelis‐Menten constant of Rubisco activity
for O2 at 25°C |
O |
210 |
mmol mol–1
|
O2
concentration in the ambient air |
R |
8.314 a
|
J mol–1
K–1
|
Gas constant |
r |
0.2 e
|
― |
Reflectance of shortwave
irradiance (albedo) |
α |
0.2 e
|
― |
Quantum yield |
αs |
0.6 e
|
― |
Absorptance of
shortwave by leaf |
αl |
0.96 e
|
― |
Absorptance
of longwave by leaf |
Γ |
42.75 c
|
μmol mol–1
|
CO2 compensation point at 25°C |
ε |
0.97 e
|
― |
Emissivity of longwave by
leaf |
θ |
0.95 e
|
― |
Curvature of the irradiance
response curve |
λ |
44000 a
|
J mol–1
|
Latent heat of vaporization |
σ |
5.6697×10-8 a
|
W m–2
K–4
|
Stefan‐Boltzmann constant |