# CO2


As mentioned in previous sections, CO2 concentration
affects: 

* radiation-limited biomass accumulation ($\Delta Q_{r}$;  Section @ref(Radiation-limited-biomass))
via a CO\textsubscript{2} factor affecting the RUE ($f_{c}$; Equation \@ref(eq:CO2Factor4Photosynthesis)), 
* transpiration efficiency ($TE$, Equation \@ref(eq:TranspirationEfficiency))
via another CO\textsubscript{2} factor ($f_{c,\,TE}$; Fig. \@ref(fig:wdCO2TE)), 
* N critic concentration of the leaves (Equation \@ref(eq:NitrogenStress),
Equation \@ref(eq:NStressPhoto), Equation \@ref(eq:NStressLeafExpansion), Equation \@ref(eq:NStressFilling)
and Fig. \@ref(fig:wbCO2CritLeaf)).