DOI: 10.1016/j.atmosenv.2014.08.068
Scopus记录号: 2-s2.0-84907236838
论文题名: Diel trend in plant sensitivity to ozone: Implications for exposure- and flux-based ozone metrics
作者: Grantz D ; A
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 98 起始页码: 571
结束页码: 580
语种: 英语
英文关键词: Air quality standards
; Antioxidant defense
; Diurnal sensitivity
; Ozone
; Plant injury
; Repair
Scopus关键词: Ozone
; Repair
; Antioxidant defense
; Diurnal sensitivity
; Plant injury
; Plant sensitivity
; Air quality standards
; ozone
; air quality
; antioxidant
; atmospheric pollution
; cotton
; diel variation
; flux measurement
; ozone
; phytotoxicity
; pollution effect
; pollution exposure
; Article
; correlational study
; dose response
; environmental parameters
; landscape
; Monte Carlo method
; phytotoxicity
; plant sensitivity
; stomatal conductance
; trend study
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Plant sensitivity to ozone (O3) is critical to modeling impacts of air pollution on vegetation. A diel timecourse of sensitivity (S) was recently determined in Pima cotton (Grantz et al., 2013). The sensitivity parameter serves as a weighting factor for stomatal uptake (ozone flux, F), or cumulative F (dose, D). Previous approaches used various weighting schemes to modify ozone concentration ([O3]) or cumulative [O3] (exposure, E). Use of the S parameter allows calculation of effective flux (Feff) and effective dose (Deff). Though theoretically sound, the practical significance of S has not been evaluated due to the previous lack of available data. Here, the newly available S parameter is used to explore the relationships between exposure- and flux-based O3 metrics in response to scenarios of contrasting stomatal conductance (gs) and ambient [O3].The O3 scenarios were similar but differed in timing of peak [O3]. E varied by up to 13.7%, D by up to 15.4%, and Deff, which factors in sensitivity, by up to 19.0%. The gs scenarios differed in midday magnitude and nocturnal closure. Cumulative gs varied by 65.2%, which was attenuated in D to 49.2% and in Deff to 51.1%. A simulation of hourly [O3], F, and Feff was run using Monte Carlo techniques with a full month of ambient [O3] data. Resulting diel timecourses of [O3], F, and Feff were realistic, with the principal sources of uncertainty in the physiological parameters, gs and S. Analysis of hourly values from the scenarios and the simulation output demonstrated significant correlation among the O3 metrics. However, the uncertainty in both F and Feff predicted from [O3] was large and proportional to [O3], yielding greatest uncertainty under conditions of high [O3] and potential phytotoxicity. In contrast, Feff was significantly correlated with F, with low variability that was not proportional to F. As a result, uncertainty was low and prediction potentially useful under conditions of likely injury. These results suggest that F, which incorporates gs, represents a substantial improvement over ambient [O3], which does not. Feff, which incorporates S, was closely related to F, which does not use S. The substantial effort required to measure or model S and Feff may not be justified under some conditions. Further research to obtain additional timecourses of S and to explore additional [O3] and gs scenarios is urgently required. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80517
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Botany and Plant Sciences, University of California at Riverside, 9240 South Riverbend Ave., Parlier, CA, United States
Recommended Citation:
Grantz D,A. Diel trend in plant sensitivity to ozone: Implications for exposure- and flux-based ozone metrics[J]. Atmospheric Environment,2014-01-01,98