Concentration- and flux-based ozone dose–response relationships for five poplar clones grown in North China

Dearn, Karl D.; Gao, Feng; Yue, Xin; Jia, Huixia; Li, Kaihui; Hu, Jianjun; Feng, Zhaozhong

doi:10.1016/j.envpol.2015.08.034

Cited by 64 publications

(73 citation statements)

References 73 publications

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“…Rooted cuttings of two hybrid poplar clones were cultivated into 20 L circular plastic pots on April 10, 2016. Based on our previous studies and Hu et al (2015), we selected widely-planted poplar clones '546' (P. deltoides cv. '55/56' × P. deltoides cv.…”

Section: Experimental Site and Plant Materialsmentioning

confidence: 99%

“…The relative biomass (RB) was calculated according to Hu et al (2015). Firstly, a linear regression between the actual biomass and the accumulated ozone exposure or the stomatal uptake was made for each poplar clone in order to obtain the y-intercept (i.e., the hypothetically maximum biomass at zero ozone exposure or uptake).…”

Section: Biomassmentioning

confidence: 99%

“…In 2007, China's total area of poplar plantation has reached 7 million km 2 (Fang, 2008). On the other hand, different poplar clones have been reported to have different sensitivities to ozone damage (Berrang et al, 1991;Di Baccio et al, 2014;Dumont et al, 2014;Hu et al, 2015;Karnosky et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

“…The ozone exposure index AOT40 (Accumulation Over a Threshold hourly ozone concentration of 40 ppb) is widely applied . However, as ozone effects on plants depend not only on atmospheric concentrations, but also on ozone uptake through the stomata , stomatal flux-based metrics like the Phytotoxic Ozone Dose above a threshold Y, POD Y have been more recently applied (Gerosa et al, 2015;Hu et al, 2015;Mills et al, 2011). Most studies about ozone exposure-and flux-response relationships are based on crop yields (Betzelberger et al, 2010;Feng et al, 2012;Grunhage et al, 2012;Pleijel et al, 2007), tree biomass and visible injury symptoms (Marzuoli et al, 2009;Sicard et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Ozone exposure- and flux-based response relationships with photosynthesis, leaf morphology and biomass in two poplar clones

Shang

Feng

Пин

et al. 2017

Science of The Total Environment

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Section: Experimental Site and Plant Materialsmentioning

confidence: 99%

Section: Biomassmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ozone exposure- and flux-based response relationships with photosynthesis, leaf morphology and biomass in two poplar clones

Shang

Feng

Пин

et al. 2017

Science of The Total Environment

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“…(2015) reported similar effects of O 3 on stomatal behavior of European and Japanese beech species, while Hu et al. (2015) found that poplar clones grown in China were comparable in sensitivity to European beech and birch. However, few such studies, providing a direct comparison of sensitivity, have yet been reported.…”

Section: Extrapolationmentioning

confidence: 99%

Current and future ozone risks to global terrestrial biodiversity and ecosystem processes

Fuhrer

Martin

Mills

et al. 2016

Ecology and Evolution

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Risks associated with exposure of individual plant species to ozone (O3) are well documented, but implications for terrestrial biodiversity and ecosystem processes have received insufficient attention. This is an important gap because feedbacks to the atmosphere may change as future O3 levels increase or decrease, depending on air quality and climate policies. Global simulation of O3 using the Community Earth System Model (CESM) revealed that in 2000, about 40% of the Global 200 terrestrial ecoregions (ER) were exposed to O3 above thresholds for ecological risks, with highest exposures in North America and Southern Europe, where there is field evidence of adverse effects of O3, and in central Asia. Experimental studies show that O3 can adversely affect the growth and flowering of plants and alter species composition and richness, although some communities can be resilient. Additional effects include changes in water flux regulation, pollination efficiency, and plant pathogen development. Recent research is unraveling a range of effects belowground, including changes in soil invertebrates, plant litter quantity and quality, decomposition, and nutrient cycling and carbon pools. Changes are likely slow and may take decades to become detectable. CESM simulations for 2050 show that O3 exposure under emission scenario RCP8.5 increases in all major biomes and that policies represented in scenario RCP4.5 do not lead to a general reduction in O3 risks; rather, 50% of ERs still show an increase in exposure. Although a conceptual model is lacking to extrapolate documented effects to ERs with limited or no local information, and there is uncertainty about interactions with nitrogen input and climate change, the analysis suggests that in many ERs, O3 risks will persist for biodiversity at different trophic levels, and for a range of ecosystem processes and feedbacks, which deserves more attention when assessing ecological implications of future atmospheric pollution and climate change.

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Impact of Increasing CO2, and Air Pollutants (NOx, SO2, O3) on the Stable Isotope Ratios in Tree Rings

Siegwolf

Savard

Grams

et al. 2022

Stable Isotopes in Tree Rings

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Anthropogenic activities such as industrialization, land use change and intensification of agriculture strongly contribute to changes in the concentrations of atmospheric trace gases. Carbon dioxide (CO2), oxidized N compounds(NOx), sulfur dioxide (SO2) and ozone(O3) have particularly significant impacts on plant physiology. CO2, the substrate for plant photosynthesis, is in the focus of interest as the ambiguous effect of its increasing concentration is controversially discussed. Is its increase beneficial for plants or are plants non-responsive? NOx, a product of combustion and lightning, can have either fertilizing or toxic effects depending on the concentration and form. This is also the case for reduced forms of nitrogen(NHy), which are mostly emitted from agricultural and industrial activities. In combination CO2and N compounds can have a fertilizing effect. SO2 and ground-level O3 are mostly phytotoxic, depending on their concentrations, daily and seasonal exposure dynamics, and tree health condition. Elevated concentrations of both substances arise from industrial combustion processes and car emissions. All of the above-mentioned gaseous compounds affect plant metabolism in their specific ways and to different degrees. This impacts the isotope fractionation leaving specific fingerprints in the C, O, (H) and N isotope ratios of organic matter. In this chapter we will show how the impact of increasing CO2 and air pollutants are reflected in the isotopic ratios of tree rings. Increasing CO2 shows a considerable variation in responses of δ13C and to a minor degree in δ18O. Ozone and SO2 exposure cause an overall increase of the δ13C values in tree rings and a slight decrease in δ18O, mimicking an increase in net photosynthesis (AN) and to a minor degree in stomatal conductance (gs). However, directly measured AN and gs values show the opposite, which does not always correspond with the isotope derived gas exchange data. NO2 concentration as it is found near highly frequented freeways or industrial plants causes an increase of δ13C while δ18O decreases. This indicates an increase in both AN and gs, which corresponds well with directly measured gas exchange data. Thus the air quality situation must be taken in consideration for the interpretation of isotope values in tree rings.

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Concentration- and flux-based ozone dose–response relationships for five poplar clones grown in North China

Cited by 64 publications

References 73 publications

Ozone exposure- and flux-based response relationships with photosynthesis, leaf morphology and biomass in two poplar clones

Ozone exposure- and flux-based response relationships with photosynthesis, leaf morphology and biomass in two poplar clones

Current and future ozone risks to global terrestrial biodiversity and ecosystem processes

Impact of Increasing CO2, and Air Pollutants (NOx, SO2, O3) on the Stable Isotope Ratios in Tree Rings

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