aa
|
Fractionation during diffusion through air |
‰ |
4.4 |
ai
|
Fractionation during diffusion through water |
‰ |
1.8 |
b |
Fractionation during carboxylation |
‰ |
29 |
c1
|
Coefficient of proportionality |
m3 mol-1 °C |
0.0367 |
Ca
|
Ambient CO2 concentration |
ppm |
|
Ci
|
Internal CO2 concentration |
ppm |
|
Ecd
|
Transpiration rate at stand level |
mm
d-1
|
|
Ecdmax
|
Maximal transpiration rate at stand level |
mm
d-1
|
|
f |
Fractionation during photorespiration |
‰ |
16.2 |
gm
|
Internal conductance |
mol m-2
s-1
|
|
gm∞
|
Infinite value of gi
|
mol
m-2 s-1
|
∞ |
gC
|
Stomatal conductance at stand level |
mol
H2O m-2 d-1
|
|
\(g_{C\hat{\alpha}\ }\) |
Stomatal conductance at stand level corrected
by \(\hat{\alpha}\)
|
mol H2O m-2
d-1
|
|
GPP |
Gross primary production |
g C m-2
d-1
|
|
GPPEC
|
Gross primary production estimated by
eddy-covariance |
g C m-2 d-1
|
|
GPPiso/SF
|
Gross primary production estimated by
combined method with isotopic data and sapflow measurements |
g C
m-2 d-1
|
|
GPPPRELES
|
Gross primary production estimated by PRELES
model |
g C m-2 d-1
|
|
LAI |
Leaf Area Index |
m2 m-2
|
|
MC
|
Molar mass of carbon |
g mol-1
|
12 |
MH2O
|
Molar mass of water |
g mol-1
|
18 |
nD
|
Number of day light hours |
NA |
|
P145
|
Atmospheric pressure at 145m a.s.l |
kPa |
99.6 |
PPFD |
Photosynthetic photon flux density |
mol m-2
d-1
|
|
R |
Universal gas constant |
J mol-1
K-1
|
8.314 |
r |
Ratio of diffusivities of CO2 and water vapour in
the air |
NA |
1.6 |
REW |
Relative extractable water |
NA |
|
RH |
Relative humidity |
% |
|
S(t) |
State of photosynthetic acclimation (°C) at time t (day) |
°C |
|
S0
|
Threshold value of the photosynthetic state of
acclimation |
°C |
-5.33 |
SWCFC
|
Soil water content at field capacity |
m3 m-3
|
|
\(\text{SWC}_{t}\) |
Soil water content at sampling time |
m3 m-3
|
|
SWCWP
|
Soil water content at wilting point |
m3 m-3
|
|
Ta
|
Ambient temperature |
°C |
|
TK
|
Temperature |
K |
|
VPDD
|
Day light mean VPD |
kPa |
|
VPDZ
|
Normalised VPD |
kPa |
|
WUEi
|
Intrinsic water use efficiency |
ppm |
|
\(\hat{\alpha}\) |
Photosynthetic capacity |
°C |
|
\({\hat{\alpha}}_{\max}\) |
Maximal photosynthetic capacity |
°C |
|
Δ |
Observed carbon discrimination during gas-exchange |
‰ |
|
δ13Ca
|
Ratio of heavy to light
13C isotope in the air |
‰ |
|
δ13Cp
|
Ratio of heavy to light
13C isotope in phloem content |
‰ |
|
Γ*
|
CO2 compensation point |
μmol
mol-1
|
|