Modeling stomatal conductance and ozone uptake of Fagus crenata grown under different nitrogen loads

- Our objective was to construct a model to stomatal conductance for Fagus crenata.
- We developed stomatal conductance model considering the effects of N load to soil.
- The model could explained 62% of variability in stomatal conductance.
- The N load to soil at 100 kg ha−1 year−1 decreased stomatal O3 uptake.

A multiplicative stomatal conductance model was constructed to estimate stomatal O3 uptake of Fagus crenata exposed to O3 under different N loads to the soil. Our stomatal conductance model included environmental functions such as the stomatal responses of F. crenata to diurnal changes, chronic O3 stress (AOT0), acute O3 stress (O3 concentration), and nitrogen load to soil. The model could explain 62% of the variability in stomatal conductance. We suggest therefore that stomatal closure induced by O3 and N load-induced soil acidification must be taken into account in developing a stomatal conductance model for estimating stomatal O3 uptake for future risk assessment of O3 impact on Japanese forest tree species such as F. crenata.