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Observation of ozone deposition flux and its contribution to stomatal uptake over a winter wheat field in eastern China
Atmospheric Environment ( IF 5 ) Pub Date : 2024-03-25 , DOI: 10.1016/j.atmosenv.2024.120472 Hui Zhao , Jing Huang , Youfei Zheng
Atmospheric Environment ( IF 5 ) Pub Date : 2024-03-25 , DOI: 10.1016/j.atmosenv.2024.120472 Hui Zhao , Jing Huang , Youfei Zheng
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Ground-level ozone (O) poses a significant threat to food security in China. Therefore, it is imperative to conduct a comprehensive scientific evaluation of the potential hazards posed by O to agricultural crops. This study continuously observed variation in meteorological factors, O concentration, O deposition rate and flux, and quantified the distribution characteristics of O deposition flux in stomatal and non-stomatal pathways. Results suggested that the O dry deposition rate and flux in winter wheat fields exhibited relatively stable variations at night but pronounced fluctuations during the day. Their mean values were 0.31 cm s and -0.0044 μmol m·s, respectively, with peak values occurring at 08:30 and 14:00. The cumulative O total flux during the main growth season of winter wheat was 26.1 mmol m, with stomatal and non-stomatal fluxes accounting for 7.7 mmol m and 18.4 mmol m, respectively. The proportions of total O flux in stomatal and non-stomatal channels were 29.5% and 70.5%, respectively, with daytime proportions being 39.7% and 60.3%, respectively. These findings provide crucial insights for future accurate assessments of crop yield loss due to O at the earth's surface.
更新日期：2024-03-25
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