Ozone risk assessment is affected by nutrient availability: Evidence from a simulation experiment under free air controlled exposure (FACE)

Zhang, Lu; Hoshika, Yasutomo; Carrari, Elisa; Badea, Ovidiu; Paoletti, Elena

doi:10.1016/j.envpol.2018.03.102

Cited by 28 publications

(26 citation statements)

References 90 publications

(123 reference statements)

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“…Modelling studies estimated POD1 values to be 2-30 mmol m −2 in Southern Europe (Anav et al, 2016;Sicard et al, 2016a). In field conditions in Italy, POD1 values were reported to be around 28-50 mmol m −2 for poplars (Hoshika et al, 2018b;Zhang et al, 2018) and 4-19 mmol m −2 for oaks (Hoshika et al, 2018a).…”

Section: Ozone Metricsmentioning

confidence: 99%

“…86% of the sites where the SWC effect was considered in the POD1 calculation) showed POD1 values exceeding the CLs corresponding to a 5% biomass reduction. Such CLs were calculated under open-air experimental conditions (POD1 = 5.0 to 8.8 mmol m −2 for oaks in Hoshika et al, 2018a; POD1 = 5.1 mmol m −2 for poplars in Zhang et al, 2018) and open-top chamber experiments (POD1 = 6.3 mmol m −2 for beech and birch, POD1 = 23.8 mmol m −2 for needle leaf trees, and POD1 = 26.3 mmol m −2 for Aleppo pine, holm oak and Norway spruce in Büker et al, 2015). Generally, we found a good agreement between values of the same metric accumulated over different time windows (Fig.…”

Section: Ozone Metricsmentioning

confidence: 99%

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Toward stomatal–flux based forest protection against ozone: The MOTTLES approach

Paoletti

Alivernini

Anav

et al. 2019

Science of The Total Environment

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Section: Ozone Metricsmentioning

confidence: 99%

Section: Ozone Metricsmentioning

confidence: 99%

Toward stomatal–flux based forest protection against ozone: The MOTTLES approach

Paoletti

Alivernini

Anav

et al. 2019

Science of The Total Environment

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“…Steady-state A is typically measured within 2-5 min from changing conditions [61,62], because longer measurement times would affect the steady-state activation of Rubisco and introduce errors [61]. Parameterizing gs is a pillar of flux-based O 3 risk assessment for vegetation [63,64]. Therefore, we recommend separate recordings i.e., first for steady-state A and then for steady-state gs, especially when leaves are exposed to O 3 .…”

Section: Steady-state and Dynamic Responses Of Leaf-level Gas Exchange (Sun/shade)mentioning

confidence: 99%

Ozone Amplifies Water Loss from Mature Trees in the Short Term But Decreases It in the Long Term

Paoletti¹,

Grulke²,

Matyssek

2019

Forests

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We measured whole-tree transpiration of mature Fagus sylvatica and Picea abies trees exposed to ambient and twice-ambient O3 regimes (1xO3 and 2xO3 free-air fumigation). After eight years, mean daily total transpiration did not vary with the O3 regime over the 31 days of our study, even though individual daily values increased with increasing daily O3 peaks in both species. Although the environmental parameters were similar at 1xO3 and 2xO3, the main factors affecting daily transpiration were vapour pressure deficit in 2xO3 spruce and O3 peaks in beech. For a mechanistic explanation, we measured O3-induced sluggish stomatal responses to variable light (sunflecks) by means of leaf-level gas exchange measurements only in the species where O3 was a significant factor for transpiration, i.e., beech. Stomata were always slower in closing than in opening. The 2xO3 stomata were slower in opening and mostly in closing than 1xO3 stomata, so that O3 uptake and water loss were amplified before a steady state was reached. Such delay in the stomatal reaction suggests caution when assessing stomatal conductance under O3 pollution, because recording gas exchange at the time photosynthesis reached an equilibrium resulted in a significant overestimation of stomatal conductance when stomata were closing (ab. 90% at 1xO3 and 250% at 2xO3). Sun and shade leaves showed similar sluggish responses, thus suggesting that sluggishness may occur within the entire crown. The fact that total transpiration was similar at 1xO3 and 2xO3, however, suggests that the higher water loss due to stomatal sluggishness was offset by lower steady-state stomatal conductance at 2xO3. In conclusion, O3 exposure amplified short-term water loss from mature beech trees by slowing stomatal dynamics, while decreased long-term water loss because of lower steady-state stomatal conductance. Over the short term of this experiment, the two responses offset each other and no effect on total transpiration was observed.

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“…where, [O 3 ] i represents the hourly average O 3 concentration during the daytime hours between 8:00 and 20:00 and n is the number of hours in the growing seasons for forest trees and crops [15,27].…”

Section: Vegetation Health Metricsmentioning

confidence: 99%

“…To better estimate the risk assessment of O 3 , several indices have been suggested by previous studies for human (SOMO35: annual sum of maximum daily 8-h ozone means over 35 ppb), forest trees and vegetation/crops (AOT40: the accumulated exposure over an hourly threshold of 40 ppb during daylight hours between 8:00 and 20:00 in the growing seasons) [3,14,15]. To date, numerous studies have been carried out in Tehran investigating various issues of ambient air pollution [16,17].…”

Section: Introductionmentioning

confidence: 99%

Human, Forest and vegetation health metrics of ground-level ozone (SOMO35, AOT40f and AOT40v) in Tehran

Faridi

Akbari

Faridi

et al. 2020

J Environ Health Sci Engineer

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Purpose We aimed to investigate the spatial O 3 indices (SOMO35: annual sum of maximum daily 8-h ozone means over 35 ppb, AOT40: the accumulated exposure over an hourly threshold of 40 ppb during daylight hours between 8:00 and 20:00 in the growing seasons of plants) in Tehran (2019-2020). Methods The data of ambient O 3 concentrations, measured at twenty-three regulatory ambient air quality monitoring stations (AQMSs) in Tehran, were obtained. Results The annual mean O 3 concentrations were found to be 15.8-25.7 ppb; the highest and lowest annual mean concentration of ambient O 3 were observed in Shahrdari 22 and Shahr-e-Rey stations, respectively. Spatial distribution of exposure to O 3 across Tehran was in the range of 1.36-1.64; the highest O 3 concentrations were observed in the northern, west and south-western parts of Tehran, while the central and south areas of Tehran city experienced low to moderate concentrations. The indices of SOMO35, AOT40f and AOT40v across AQMSs in Tehran was in the range of 1830-6437 ppb. Days, 10,613-39,505 ppb.h and 4979-16,804 ppb.h, respectively. For Tehran city, the indices of SOMO35 and AOT40f were 4138 ppb. days and 27,556 ppb.h respectively.Our results revealed that the value of SOMO35 across AQMSs of Tehran was higher than the recommended target value of 3000 ppb. days. Conclusions To reduce O 3 pollution and its effects on both human and plants health, the governmental organizations should take appropriate sustainable control policies.

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Ozone risk assessment is affected by nutrient availability: Evidence from a simulation experiment under free air controlled exposure (FACE)

Cited by 28 publications

References 90 publications

Toward stomatal–flux based forest protection against ozone: The MOTTLES approach

Toward stomatal–flux based forest protection against ozone: The MOTTLES approach

Ozone Amplifies Water Loss from Mature Trees in the Short Term But Decreases It in the Long Term

Human, Forest and vegetation health metrics of ground-level ozone (SOMO35, AOT40f and AOT40v) in Tehran

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