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Journal Articles

Ozone-induced stomatal sluggishness changes carbon and water balance of temperate deciduous forests

Hoshika, Yasutomo*; Katata, Genki; Deushi, Makoto*; Watanabe, Makoto*; Koike, Takayoshi*; Paoletti, E.*

Scientific Reports (Internet), 5, p.9871_1 - 9871_8, 2015/05

 Times Cited Count:81 Percentile:94.26(Multidisciplinary Sciences)

The phytotoxic nature of tropospheric ozone can impair forest productivity and affects stomatal functions. Although a delay in stomatal responses (ozone-induced stomatal sluggishness) to fluctuating stimuli has a potential to change carbon and water balance in forests, this effect is not included in the current models for ozone risk assessment to forest. Here we examined effects of ozone-induced stomatal sluggishness on carbon gain and transpiration of global deciduous forests by combining land surface model and global atmospheric chemistry model. Ozone-induced stomatal sluggishness enhances stomatal ozone uptake resulting in facilitating a decline of forest carbon acquisition and also enhancing transpiration. Our findings are consistent with previous experimental and field observational results, indicating that forest trees suffer significant impairment of carbon and water balance through ozone-induced stomatal sluggishness.

Oral presentation

Toward modeling of stomatal conductance under elevated ozone in forest trees

Hoshika, Yasutomo*; Watanabe, Makoto*; Katata, Genki; De Marco, A.*; Deushi, Makoto*; Carriero, G.*; Koike, Takayoshi*; Paoletti, E.*

no journal, , 

Ozone (O$$_{3}$$) enters leaves via stomata and causes a damage to leaves of trees. Modeling of stomatal conductance (g$$_{s}$$) is considered as an essential factor to assess O$$_{3}$$ impacts. In this presentation, our recent progress of research for the modeling of g$$_{s}$$ under elevated O$$_{3}$$ is summarized. First, we investigated g$$_{s}$$ parameters of the Jarvis-type model for forest tree types throughout the world. The optimal temperature of g$$_{s}$$ and g$$_{s}$$ response to predawn water potential changed according to the growth conditions. Next, an optimization model of stomata including O$$_{3}$$ effects was tested in free-air O$$_{3}$$ exposure experiment on Siebold's beech in Japan. The optimal stomatal model explained O$$_{3}$$-induced stomatal closure in early summer. However, in late summer and autumn, the model did not explain the effects of O$$_{3}$$ on g$$_{s}$$. This reflects the loss of closing response of stomata by O$$_{3}$$ (stomatal sluggishness) such as under low light conditions. Finally, we examined the effects of O$$_{3}$$-induced stomatal sluggishness on carbon gain and transpiration of temperate deciduous forests in the Northern Hemisphere by combining a detailed multi-layer land surface model and a global atmospheric chemistry model. Our findings are consistent with previous experimental evidences, suggesting significant impairment of forest carbon and water balances attributed by O$$_{3}$$-induced stomatal sluggishness.

Oral presentation

Global ozone impacts on forest carbon and water use

Hoshika, Yasutomo*; Katata, Genki; Watanabe, Makoto*; Deushi, Makoto*; Koike, Takayoshi*; Paoletti, E.*

no journal, , 

no abstracts in English

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