Leaf and canopy conductance in aspen and aspen-birch forests under free-air enrichment of carbon dioxide and ozone.
Identifieur interne : 003576 ( Main/Exploration ); précédent : 003575; suivant : 003577Leaf and canopy conductance in aspen and aspen-birch forests under free-air enrichment of carbon dioxide and ozone.
Auteurs : Johan Uddling [États-Unis] ; Ronald M. Teclaw ; Kurt S. Pregitzer ; David S. EllsworthSource :
- Tree physiology [ 0829-318X ] ; 2009.
Descripteurs français
- KwdFr :
- Betula (effets des médicaments et des substances chimiques), Betula (métabolisme), Dioxyde de carbone (métabolisme), Dioxyde de carbone (pharmacologie), Ozone (métabolisme), Ozone (pharmacologie), Photosynthèse (MeSH), Populus (effets des médicaments et des substances chimiques), Populus (métabolisme), Stomates de plante (effets des médicaments et des substances chimiques), Stomates de plante (métabolisme), Stomates de plante (physiologie).
- MESH :
- effets des médicaments et des substances chimiques : Betula, Populus, Stomates de plante.
- métabolisme : Betula, Dioxyde de carbone, Ozone, Populus, Stomates de plante.
- pharmacologie : Dioxyde de carbone, Ozone.
- physiologie : Stomates de plante.
- Photosynthèse.
English descriptors
- KwdEn :
- Betula (drug effects), Betula (metabolism), Carbon Dioxide (metabolism), Carbon Dioxide (pharmacology), Ozone (metabolism), Ozone (pharmacology), Photosynthesis (MeSH), Plant Stomata (drug effects), Plant Stomata (metabolism), Plant Stomata (physiology), Populus (drug effects), Populus (metabolism).
- MESH :
- chemical , metabolism : Carbon Dioxide, Ozone.
- drug effects : Betula, Plant Stomata, Populus.
- metabolism : Betula, Plant Stomata, Populus.
- chemical , pharmacology : Carbon Dioxide, Ozone.
- physiology : Plant Stomata.
- Photosynthesis.
Abstract
Increasing concentrations of atmospheric carbon dioxide (CO2) and tropospheric ozone (O3) have the potential to affect tree physiology and structure, and hence forest feedbacks on climate. Here, we investigated how elevated concentrations of CO2 (+45%) and O3 (+35%), alone and in combination, affected conductance for mass transfer at the leaf and canopy levels in pure aspen (Populus tremuloides Michx.) and in mixed aspen and birch (Betula papyrifera Marsh.) forests in the free-air CO2-O3 enrichment experiment near Rhinelander, Wisconsin (Aspen FACE). The study was conducted during two growing seasons, when steady-state leaf area index (L) had been reached after > 6 years of exposure to CO2- and O3-enrichment treatments. Canopy conductance (g(c)) was estimated from stand sap flux, while leaf-level conductance of sun leaves in the upper canopy was derived by three different and independent methods: sap flux and L in combination with vertical canopy modelling, leaf 13C discrimination methodology in combination with photosynthesis modelling and leaf-level gas exchange. Regardless of the method used, the mean values of leaf-level conductance were higher in trees growing under elevated CO2 and/or O3 than in trees growing in control plots, causing a CO2 x O3 interaction that was statistically significant (P < or = 0.10) for sap flux- and (for birch) 13C-derived leaf conductance. Canopy conductance was significantly increased by elevated CO2 but not significantly affected by elevated O3. Investigation of a short-term gap in CO2 enrichment demonstrated a +10% effect of transient exposure of elevated CO2-grown trees to ambient CO2 on g(c). All treatment effects were similar in pure aspen and mixed aspen-birch communities. These results demonstrate that short-term primary stomatal closure responses to elevated CO2 and O3 were completely offset by long-term cumulative effects of these trace gases on tree and stand structure in determining canopy- and leaf-level conductance in pure aspen and mixed aspen-birch forests. Our results, together with the findings from other long-term FACE experiments with trees, suggest that model assumptions of large reductions in stomatal conductance under rising atmospheric CO2 are very uncertain for forests.
DOI: 10.1093/treephys/tpp070
PubMed: 19773339
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<author><name sortKey="Uddling, Johan" sort="Uddling, Johan" uniqKey="Uddling J" first="Johan" last="Uddling">Johan Uddling</name>
<affiliation wicri:level="2"><nlm:affiliation>School of Natural Resources and Environment, University of Michigan, 440 Church Street, Ann Arbor, MI 48109, USA. johan.uddling@dpes.gu.se</nlm:affiliation>
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<author><name sortKey="Teclaw, Ronald M" sort="Teclaw, Ronald M" uniqKey="Teclaw R" first="Ronald M" last="Teclaw">Ronald M. Teclaw</name>
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<author><name sortKey="Pregitzer, Kurt S" sort="Pregitzer, Kurt S" uniqKey="Pregitzer K" first="Kurt S" last="Pregitzer">Kurt S. Pregitzer</name>
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<author><name sortKey="Ellsworth, David S" sort="Ellsworth, David S" uniqKey="Ellsworth D" first="David S" last="Ellsworth">David S. Ellsworth</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en">Leaf and canopy conductance in aspen and aspen-birch forests under free-air enrichment of carbon dioxide and ozone.</title>
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<term>Carbon Dioxide (metabolism)</term>
<term>Carbon Dioxide (pharmacology)</term>
<term>Ozone (metabolism)</term>
<term>Ozone (pharmacology)</term>
<term>Photosynthesis (MeSH)</term>
<term>Plant Stomata (drug effects)</term>
<term>Plant Stomata (metabolism)</term>
<term>Plant Stomata (physiology)</term>
<term>Populus (drug effects)</term>
<term>Populus (metabolism)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>Betula (effets des médicaments et des substances chimiques)</term>
<term>Betula (métabolisme)</term>
<term>Dioxyde de carbone (métabolisme)</term>
<term>Dioxyde de carbone (pharmacologie)</term>
<term>Ozone (métabolisme)</term>
<term>Ozone (pharmacologie)</term>
<term>Photosynthèse (MeSH)</term>
<term>Populus (effets des médicaments et des substances chimiques)</term>
<term>Populus (métabolisme)</term>
<term>Stomates de plante (effets des médicaments et des substances chimiques)</term>
<term>Stomates de plante (métabolisme)</term>
<term>Stomates de plante (physiologie)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Carbon Dioxide</term>
<term>Ozone</term>
</keywords>
<keywords scheme="MESH" qualifier="drug effects" xml:lang="en"><term>Betula</term>
<term>Plant Stomata</term>
<term>Populus</term>
</keywords>
<keywords scheme="MESH" qualifier="effets des médicaments et des substances chimiques" xml:lang="fr"><term>Betula</term>
<term>Populus</term>
<term>Stomates de plante</term>
</keywords>
<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Betula</term>
<term>Plant Stomata</term>
<term>Populus</term>
</keywords>
<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Betula</term>
<term>Dioxyde de carbone</term>
<term>Ozone</term>
<term>Populus</term>
<term>Stomates de plante</term>
</keywords>
<keywords scheme="MESH" qualifier="pharmacologie" xml:lang="fr"><term>Dioxyde de carbone</term>
<term>Ozone</term>
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<keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en"><term>Carbon Dioxide</term>
<term>Ozone</term>
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<keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Stomates de plante</term>
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<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Plant Stomata</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Photosynthesis</term>
</keywords>
<keywords scheme="MESH" xml:lang="fr"><term>Photosynthèse</term>
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<front><div type="abstract" xml:lang="en">Increasing concentrations of atmospheric carbon dioxide (CO2) and tropospheric ozone (O3) have the potential to affect tree physiology and structure, and hence forest feedbacks on climate. Here, we investigated how elevated concentrations of CO2 (+45%) and O3 (+35%), alone and in combination, affected conductance for mass transfer at the leaf and canopy levels in pure aspen (Populus tremuloides Michx.) and in mixed aspen and birch (Betula papyrifera Marsh.) forests in the free-air CO2-O3 enrichment experiment near Rhinelander, Wisconsin (Aspen FACE). The study was conducted during two growing seasons, when steady-state leaf area index (L) had been reached after > 6 years of exposure to CO2- and O3-enrichment treatments. Canopy conductance (g(c)) was estimated from stand sap flux, while leaf-level conductance of sun leaves in the upper canopy was derived by three different and independent methods: sap flux and L in combination with vertical canopy modelling, leaf 13C discrimination methodology in combination with photosynthesis modelling and leaf-level gas exchange. Regardless of the method used, the mean values of leaf-level conductance were higher in trees growing under elevated CO2 and/or O3 than in trees growing in control plots, causing a CO2 x O3 interaction that was statistically significant (P < or = 0.10) for sap flux- and (for birch) 13C-derived leaf conductance. Canopy conductance was significantly increased by elevated CO2 but not significantly affected by elevated O3. Investigation of a short-term gap in CO2 enrichment demonstrated a +10% effect of transient exposure of elevated CO2-grown trees to ambient CO2 on g(c). All treatment effects were similar in pure aspen and mixed aspen-birch communities. These results demonstrate that short-term primary stomatal closure responses to elevated CO2 and O3 were completely offset by long-term cumulative effects of these trace gases on tree and stand structure in determining canopy- and leaf-level conductance in pure aspen and mixed aspen-birch forests. Our results, together with the findings from other long-term FACE experiments with trees, suggest that model assumptions of large reductions in stomatal conductance under rising atmospheric CO2 are very uncertain for forests.</div>
</front>
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<JournalIssue CitedMedium="Print"><Volume>29</Volume>
<Issue>11</Issue>
<PubDate><Year>2009</Year>
<Month>Nov</Month>
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<Title>Tree physiology</Title>
<ISOAbbreviation>Tree Physiol</ISOAbbreviation>
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<ArticleTitle>Leaf and canopy conductance in aspen and aspen-birch forests under free-air enrichment of carbon dioxide and ozone.</ArticleTitle>
<Pagination><MedlinePgn>1367-80</MedlinePgn>
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<Abstract><AbstractText>Increasing concentrations of atmospheric carbon dioxide (CO2) and tropospheric ozone (O3) have the potential to affect tree physiology and structure, and hence forest feedbacks on climate. Here, we investigated how elevated concentrations of CO2 (+45%) and O3 (+35%), alone and in combination, affected conductance for mass transfer at the leaf and canopy levels in pure aspen (Populus tremuloides Michx.) and in mixed aspen and birch (Betula papyrifera Marsh.) forests in the free-air CO2-O3 enrichment experiment near Rhinelander, Wisconsin (Aspen FACE). The study was conducted during two growing seasons, when steady-state leaf area index (L) had been reached after > 6 years of exposure to CO2- and O3-enrichment treatments. Canopy conductance (g(c)) was estimated from stand sap flux, while leaf-level conductance of sun leaves in the upper canopy was derived by three different and independent methods: sap flux and L in combination with vertical canopy modelling, leaf 13C discrimination methodology in combination with photosynthesis modelling and leaf-level gas exchange. Regardless of the method used, the mean values of leaf-level conductance were higher in trees growing under elevated CO2 and/or O3 than in trees growing in control plots, causing a CO2 x O3 interaction that was statistically significant (P < or = 0.10) for sap flux- and (for birch) 13C-derived leaf conductance. Canopy conductance was significantly increased by elevated CO2 but not significantly affected by elevated O3. Investigation of a short-term gap in CO2 enrichment demonstrated a +10% effect of transient exposure of elevated CO2-grown trees to ambient CO2 on g(c). All treatment effects were similar in pure aspen and mixed aspen-birch communities. These results demonstrate that short-term primary stomatal closure responses to elevated CO2 and O3 were completely offset by long-term cumulative effects of these trace gases on tree and stand structure in determining canopy- and leaf-level conductance in pure aspen and mixed aspen-birch forests. Our results, together with the findings from other long-term FACE experiments with trees, suggest that model assumptions of large reductions in stomatal conductance under rising atmospheric CO2 are very uncertain for forests.</AbstractText>
</Abstract>
<AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Uddling</LastName>
<ForeName>Johan</ForeName>
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<AffiliationInfo><Affiliation>School of Natural Resources and Environment, University of Michigan, 440 Church Street, Ann Arbor, MI 48109, USA. johan.uddling@dpes.gu.se</Affiliation>
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<Author ValidYN="Y"><LastName>Teclaw</LastName>
<ForeName>Ronald M</ForeName>
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<Author ValidYN="Y"><LastName>Pregitzer</LastName>
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<MeshHeadingList><MeshHeading><DescriptorName UI="D029662" MajorTopicYN="N">Betula</DescriptorName>
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<MeshHeading><DescriptorName UI="D002245" MajorTopicYN="N">Carbon Dioxide</DescriptorName>
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<QualifierName UI="Q000494" MajorTopicYN="Y">pharmacology</QualifierName>
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<MeshHeading><DescriptorName UI="D010126" MajorTopicYN="N">Ozone</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
<QualifierName UI="Q000494" MajorTopicYN="Y">pharmacology</QualifierName>
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<MeshHeading><DescriptorName UI="D010788" MajorTopicYN="N">Photosynthesis</DescriptorName>
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<MeshHeading><DescriptorName UI="D054046" MajorTopicYN="N">Plant Stomata</DescriptorName>
<QualifierName UI="Q000187" MajorTopicYN="N">drug effects</QualifierName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
<QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D032107" MajorTopicYN="N">Populus</DescriptorName>
<QualifierName UI="Q000187" MajorTopicYN="N">drug effects</QualifierName>
<QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName>
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<region><li>Michigan</li>
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<tree><noCountry><name sortKey="Ellsworth, David S" sort="Ellsworth, David S" uniqKey="Ellsworth D" first="David S" last="Ellsworth">David S. Ellsworth</name>
<name sortKey="Pregitzer, Kurt S" sort="Pregitzer, Kurt S" uniqKey="Pregitzer K" first="Kurt S" last="Pregitzer">Kurt S. Pregitzer</name>
<name sortKey="Teclaw, Ronald M" sort="Teclaw, Ronald M" uniqKey="Teclaw R" first="Ronald M" last="Teclaw">Ronald M. Teclaw</name>
</noCountry>
<country name="États-Unis"><region name="Michigan"><name sortKey="Uddling, Johan" sort="Uddling, Johan" uniqKey="Uddling J" first="Johan" last="Uddling">Johan Uddling</name>
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