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Interactive effects of air pollutants and atmospheric moisture stress on aspen growth and photosynthesis along an urban-rural gradient.

Identifieur interne : 000311 ( Main/Exploration ); précédent : 000310; suivant : 000312

Interactive effects of air pollutants and atmospheric moisture stress on aspen growth and photosynthesis along an urban-rural gradient.

Auteurs : Zhenhua Wang [République populaire de Chine] ; Chengzhang Wang [République populaire de Chine] ; Bin Wang [République populaire de Chine] ; Xin Wang [République populaire de Chine] ; Jing Li [République populaire de Chine] ; Jin Wu [Hong Kong] ; Lingli Liu [République populaire de Chine]

Source :

RBID : pubmed:32041012

Descripteurs français

English descriptors

Abstract

Atmospheric pollution could significantly alter tree growth independently and synergistically with meteorological conditions. North China offers a natural experiment for studying how plant growth responds to air pollution under different meteorological conditions, where rapid economic growth has led to severe air pollution and climate changes increase drought stress. Using a single aspen clone (Populus euramericana Neva.) as a 'phytometer', we conducted three experiments to monitor aspen leaf photosynthesis and stem growth during in situ exposure to atmospheric pollutants along the urban-rural gradient around Beijing. We used stepwise model selection to select the best multiple linear model, and we used binned regression to estimate the effects of air pollutants, atmospheric moisture stress and their interactions on aspen leaf photosynthesis and growth. Our results indicated that ozone (O3) and vapor pressure deficit (VPD) inhibited leaf photosynthesis and stem growth. The interactive effect of O3 and VPD resulted in a synergistic response: as the concentration of O3 increased, the negative impact of VPD on leaf photosynthesis and stem growth became more severe. We also found that nitrogen (N) deposition had a positive effect on stem growth, which may have been caused by an increase in canopy N uptake, although this hypothesis needs to be confirmed by further studies. The positive impact of aerosol loading may be due to diffuse radiation fertilization effects. Given the decline in aerosols and N deposition amidst increases in O3 concentration and drought risk, the negative effects of atmospheric pollution on tree growth may be aggravated in North China. In addition, the interaction between O3 and VPD may lead to a further reduction in ecosystem productivity.

DOI: 10.1016/j.envpol.2020.114076
PubMed: 32041012


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">Atmospheric pollution could significantly alter tree growth independently and synergistically with meteorological conditions. North China offers a natural experiment for studying how plant growth responds to air pollution under different meteorological conditions, where rapid economic growth has led to severe air pollution and climate changes increase drought stress. Using a single aspen clone (Populus euramericana Neva.) as a 'phytometer', we conducted three experiments to monitor aspen leaf photosynthesis and stem growth during in situ exposure to atmospheric pollutants along the urban-rural gradient around Beijing. We used stepwise model selection to select the best multiple linear model, and we used binned regression to estimate the effects of air pollutants, atmospheric moisture stress and their interactions on aspen leaf photosynthesis and growth. Our results indicated that ozone (O
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<sub>3</sub>
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<name sortKey="Liu, Lingli" sort="Liu, Lingli" uniqKey="Liu L" first="Lingli" last="Liu">Lingli Liu</name>
<name sortKey="Wang, Bin" sort="Wang, Bin" uniqKey="Wang B" first="Bin" last="Wang">Bin Wang</name>
<name sortKey="Wang, Chengzhang" sort="Wang, Chengzhang" uniqKey="Wang C" first="Chengzhang" last="Wang">Chengzhang Wang</name>
<name sortKey="Wang, Xin" sort="Wang, Xin" uniqKey="Wang X" first="Xin" last="Wang">Xin Wang</name>
</country>
<country name="Hong Kong">
<noRegion>
<name sortKey="Wu, Jin" sort="Wu, Jin" uniqKey="Wu J" first="Jin" last="Wu">Jin Wu</name>
</noRegion>
</country>
</tree>
</affiliations>
</record>

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