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Interactive effects of ozone exposure and nitrogen addition on tree root traits and biomass allocation pattern: An experimental case study and a literature meta-analysis.

Identifieur interne : 000310 ( Main/Exploration ); précédent : 000309; suivant : 000311

Interactive effects of ozone exposure and nitrogen addition on tree root traits and biomass allocation pattern: An experimental case study and a literature meta-analysis.

Auteurs : Pin Li [République populaire de Chine] ; Rongbin Yin [République populaire de Chine] ; Bo Shang [République populaire de Chine] ; Evgenios Agathokleous [République populaire de Chine] ; Huimin Zhou [République populaire de Chine] ; Zhaozhong Feng [République populaire de Chine]

Source :

RBID : pubmed:31926420

Descripteurs français

English descriptors

Abstract

Ground-level ozone (O3) pollution often co-occurs with anthropogenic nitrogen (N) deposition. Many studies have explored how O3 and soil N affect aboveground structure and function of trees, but it remains unclear how belowground processes change over a spectrum of N addition and O3 concentrations levels. Here, we explored the interactive impact of O3 (five levels) and soil N (four levels) on fine and coarse root biomass and biomass allocation pattern in poplar clone 107 (Populus euramericana cv. '74/76'). We then evaluated the modifying effects of N on the responses of tree root biomass to O3 via a synthesis of published literature. Elevated O3 inhibited while N addition stimulated root biomass, with more pronounced effects on fine roots than on coarse root. The root:shoot (R:S) ratio was markedly decreased by N addition but remained unaffected by O3. No interactive effects between O3 and N were observed on root biomass and R:S ratio. The slope of log-log linear relationship between shoot and root biomass (i.e. scaling exponent) was increased by N, but not significantly affected by O3. The analysis of published literature further revealed that the O3-induced reduction in tree root biomass was not modified by soil N. The results suggest that higher N addition levels enhance faster allocation of shoot biomass while shoot biomass scales isometrically with root biomass across multiple O3 levels. N addition does not markedly alter the sensitivity of root biomass of trees to O3. These findings highlight that the biomass allocation exhibits a differential response to environmentally realistic levels of O3 and N, and provide an important perspective for understanding and predicting net primary productivity and carbon dynamics in O3-polluted and N-enriched environments.

DOI: 10.1016/j.scitotenv.2019.136379
PubMed: 31926420


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">Ground-level ozone (O
<sub>3</sub>
) pollution often co-occurs with anthropogenic nitrogen (N) deposition. Many studies have explored how O
<sub>3</sub>
and soil N affect aboveground structure and function of trees, but it remains unclear how belowground processes change over a spectrum of N addition and O
<sub>3</sub>
concentrations levels. Here, we explored the interactive impact of O
<sub>3</sub>
(five levels) and soil N (four levels) on fine and coarse root biomass and biomass allocation pattern in poplar clone 107 (Populus euramericana cv. '74/76'). We then evaluated the modifying effects of N on the responses of tree root biomass to O
<sub>3</sub>
via a synthesis of published literature. Elevated O
<sub>3</sub>
inhibited while N addition stimulated root biomass, with more pronounced effects on fine roots than on coarse root. The root:shoot (R:S) ratio was markedly decreased by N addition but remained unaffected by O
<sub>3</sub>
. No interactive effects between O
<sub>3</sub>
and N were observed on root biomass and R:S ratio. The slope of log-log linear relationship between shoot and root biomass (i.e. scaling exponent) was increased by N, but not significantly affected by O
<sub>3</sub>
. The analysis of published literature further revealed that the O
<sub>3</sub>
-induced reduction in tree root biomass was not modified by soil N. The results suggest that higher N addition levels enhance faster allocation of shoot biomass while shoot biomass scales isometrically with root biomass across multiple O
<sub>3</sub>
levels. N addition does not markedly alter the sensitivity of root biomass of trees to O
<sub>3</sub>
. These findings highlight that the biomass allocation exhibits a differential response to environmentally realistic levels of O
<sub>3</sub>
and N, and provide an important perspective for understanding and predicting net primary productivity and carbon dynamics in O
<sub>3</sub>
-polluted and N-enriched environments.</div>
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<AbstractText>Ground-level ozone (O
<sub>3</sub>
) pollution often co-occurs with anthropogenic nitrogen (N) deposition. Many studies have explored how O
<sub>3</sub>
and soil N affect aboveground structure and function of trees, but it remains unclear how belowground processes change over a spectrum of N addition and O
<sub>3</sub>
concentrations levels. Here, we explored the interactive impact of O
<sub>3</sub>
(five levels) and soil N (four levels) on fine and coarse root biomass and biomass allocation pattern in poplar clone 107 (Populus euramericana cv. '74/76'). We then evaluated the modifying effects of N on the responses of tree root biomass to O
<sub>3</sub>
via a synthesis of published literature. Elevated O
<sub>3</sub>
inhibited while N addition stimulated root biomass, with more pronounced effects on fine roots than on coarse root. The root:shoot (R:S) ratio was markedly decreased by N addition but remained unaffected by O
<sub>3</sub>
. No interactive effects between O
<sub>3</sub>
and N were observed on root biomass and R:S ratio. The slope of log-log linear relationship between shoot and root biomass (i.e. scaling exponent) was increased by N, but not significantly affected by O
<sub>3</sub>
. The analysis of published literature further revealed that the O
<sub>3</sub>
-induced reduction in tree root biomass was not modified by soil N. The results suggest that higher N addition levels enhance faster allocation of shoot biomass while shoot biomass scales isometrically with root biomass across multiple O
<sub>3</sub>
levels. N addition does not markedly alter the sensitivity of root biomass of trees to O
<sub>3</sub>
. These findings highlight that the biomass allocation exhibits a differential response to environmentally realistic levels of O
<sub>3</sub>
and N, and provide an important perspective for understanding and predicting net primary productivity and carbon dynamics in O
<sub>3</sub>
-polluted and N-enriched environments.</AbstractText>
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<Chemical>
<RegistryNumber>66H7ZZK23N</RegistryNumber>
<NameOfSubstance UI="D010126">Ozone</NameOfSubstance>
</Chemical>
<Chemical>
<RegistryNumber>N762921K75</RegistryNumber>
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<DescriptorName UI="D018533" MajorTopicYN="N">Biomass</DescriptorName>
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<MeshHeading>
<DescriptorName UI="D009584" MajorTopicYN="N">Nitrogen</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D010126" MajorTopicYN="N">Ozone</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D018517" MajorTopicYN="N">Plant Roots</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D032107" MajorTopicYN="N">Populus</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D014197" MajorTopicYN="Y">Trees</DescriptorName>
</MeshHeading>
</MeshHeadingList>
<KeywordList Owner="NOTNLM">
<Keyword MajorTopicYN="N">Isometric allocation</Keyword>
<Keyword MajorTopicYN="N">Nitrogen addition</Keyword>
<Keyword MajorTopicYN="N">Optimal partitioning</Keyword>
<Keyword MajorTopicYN="N">Ozone</Keyword>
<Keyword MajorTopicYN="N">Root biomass</Keyword>
<Keyword MajorTopicYN="N">Root:shoot ratio</Keyword>
</KeywordList>
<CoiStatement>Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.</CoiStatement>
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<tree>
<country name="République populaire de Chine">
<noRegion>
<name sortKey="Li, Pin" sort="Li, Pin" uniqKey="Li P" first="Pin" last="Li">Pin Li</name>
</noRegion>
<name sortKey="Agathokleous, Evgenios" sort="Agathokleous, Evgenios" uniqKey="Agathokleous E" first="Evgenios" last="Agathokleous">Evgenios Agathokleous</name>
<name sortKey="Feng, Zhaozhong" sort="Feng, Zhaozhong" uniqKey="Feng Z" first="Zhaozhong" last="Feng">Zhaozhong Feng</name>
<name sortKey="Shang, Bo" sort="Shang, Bo" uniqKey="Shang B" first="Bo" last="Shang">Bo Shang</name>
<name sortKey="Yin, Rongbin" sort="Yin, Rongbin" uniqKey="Yin R" first="Rongbin" last="Yin">Rongbin Yin</name>
<name sortKey="Zhou, Huimin" sort="Zhou, Huimin" uniqKey="Zhou H" first="Huimin" last="Zhou">Huimin Zhou</name>
</country>
</tree>
</affiliations>
</record>

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Data generation: Wed Nov 18 12:07:19 2020. Site generation: Wed Nov 18 12:16:31 2020