Journal
WATER AIR AND SOIL POLLUTION
Volume 223, Issue 7, Pages 3893-3901Publisher
SPRINGER
DOI: 10.1007/s11270-012-1158-9
Keywords
Fagus crenata; Ozone uptake; Stomatal conductance modeling; Japan; Ozone
Funding
- Environment Research and Technology Development Fund of the Ministry of the Environment, Japan [B-1105]
- Japanese Society of Promotion of Science [Type B 23380078]
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We examined a performance of the multiplicative stomatal conductance model to estimate the stomatal ozone uptake for Fagus crenata. Parameterization of the model was carried out by in-situ measurements in a free-air ozone exposure experiment. The model performed fairly well under ambient conditions, with low ozone concentration. However, the model overestimated stomatal conductance under enhanced ozone condition due to ozone-induced stomatal closure. A revised model that included a parameter representing ozone-induced stomatal closure showed better estimation of ozone uptake. Neglecting ozone-induced stomatal closure induced a 20 % overestimation of the stomatal uptake of ozone. The ozone-induced stomatal closure was closely related to stomatal ozone uptake rather than accumulated concentrations of ozone exceeding 40 nmol mol(-1). Our results suggest that ozone-induced stomatal closure should be implemented to stomatal conductance model for estimating ozone uptake for F. crenata. The implementation will contribute to adequate risk assessments of ozone impacts on F. crenata forests in Japan.
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