title: Seasonal ozone uptake by a warm-temperate mixed deciduous and evergreen broadleaf forest in western Japan estimated by the Penman-Monteith approach combined with a photosynthesis-dependent stomatal model.
abstract: Canopy-level stomatal conductance over a warm-temperate mixed deciduous and evergreen broadleaf forest in Japan was estimated by the Penman-Monteith approach, as compensated by a semi-empirical photosynthesis-dependent stomatal model, where photosynthesis, relative humidity, and CO2 concentration were assumed to regulate stomatal conductance. This approach, using eddy covariance data and routine meteorological observations at a flux tower site, permits the continuous estimation of canopy-level O3 uptake, even when the Penman-Monteith approach is unavailable (i.e. in case of direct evaporation from soil or wet leaves). Distortion was observed between the AOT40 exposure index and O3 uptake through stomata, as AOT40 peaked in April, but with O3 uptake occurring in July. Thus, leaf pre-maturation in the predominant deciduous broadleaf tree species (Quercus serrata) might suppress O3 uptake in springtime, even when the highest O3 concentrations were observed.
authors.affiliation: Department of Plant Ecology, Forestry and Forest Products Research Institute, Matsunosato 1, Tsukuba 305-8687, Japan. Electronic address: kitao@ffpri.affrc.go.jp.
authors.forename: Mitsutoshi
authors.initials: M
authors.lastname: Kitao
authors.forename: Masabumi
authors.initials: M
authors.lastname: Komatsu
authors.forename: Yasutomo
authors.initials: Y
authors.lastname: Hoshika
authors.forename: Kenichi
authors.initials: K
authors.lastname: Yazaki
authors.forename: Kenichi
authors.initials: K
authors.lastname: Yoshimura
authors.forename: Saori
authors.initials: S
authors.lastname: Fujii
authors.forename: Takafumi
authors.initials: T
authors.lastname: Miyama
authors.forename: Yuji
authors.initials: Y
authors.lastname: Kominami
mesh_terms: D000393:Air Pollutants / Q000032:analysis / Q000378:metabolism*; D002980:Climate; D007564:Japan; D008954:Models, Biological; D010126:Ozone / Q000032:analysis / Q000378:metabolism*; D010788:Photosynthesis / Q000502:physiology; D018515:Plant Leaves / Q000502:physiology; D054046:Plant Stomata / Q000502:physiology*; D012621:Seasons; D014197:Trees / Q000502:physiology*
chemical_list: D000393:Air Pollutants; D010126:Ozone
keywords: Canopy-level stomatal conductance; Flux monitoring tower; Ilex pedunculosa; Quercus serrata; Stomatal O(3) uptake