Canopy leaf area of a mature evergreen Eucalyptus woodland does not respond to elevated atmospheric [CO2] but tracks water availability.
Identifieur interne : 002268 ( Main/Exploration ); précédent : 002267; suivant : 002269Canopy leaf area of a mature evergreen Eucalyptus woodland does not respond to elevated atmospheric [CO2] but tracks water availability.
Auteurs : Remko A. Duursma [Australie] ; Teresa E. Gimeno [Australie] ; Matthias M. Boer [Australie] ; Kristine Y. Crous [Australie] ; Mark G. Tjoelker [Australie] ; David S. Ellsworth [Australie]Source :
- Global change biology [ 1365-2486 ] ; 2016.
Descripteurs français
- KwdFr :
- MESH :
- analyse : Dioxyde de carbone, Eau.
- croissance et développement : Eucalyptus, Feuilles de plante.
- Atmosphère, Forêts, Nouvelle-Galles du Sud.
English descriptors
- KwdEn :
- MESH :
- chemical , analysis : Carbon Dioxide, Water.
- growth & development : Eucalyptus, Plant Leaves.
- Atmosphere, Forests, New South Wales.
Abstract
Canopy leaf area, quantified by the leaf area index (L), is a crucial driver of forest productivity, water use and energy balance. Because L responds to environmental drivers, it can represent an important feedback to climate change, but its responses to rising atmospheric [CO2] and water availability of forests have been poorly quantified. We studied canopy leaf area dynamics for 28 months in a native evergreen Eucalyptus woodland exposed to free-air CO2 enrichment (the EucFACE experiment), in a subtropical climate where water limitation is common. We hypothesized that, because of expected stimulation of productivity and water-use efficiency, L should increase with elevated [CO2]. We estimated L from diffuse canopy transmittance, and measured monthly leaf litter production. Contrary to expectation, L did not respond to elevated [CO2]. We found that L varied between 1.10 and 2.20 across the study period. The dynamics of L showed a quick increase after heavy rainfall and a steady decrease during periods of low rainfall. Leaf litter production was correlated to changes in L, both during periods of decreasing L (when no leaf growth occurred) and during periods of increasing L (active shedding of old foliage when new leaf growth occurred). Leaf lifespan, estimated from mean L and total annual litter production, was up to 2 months longer under elevated [CO2] (1.18 vs. 1.01 years; P = 0.05). Our main finding that L was not responsive to elevated CO2 is consistent with other forest FACE studies, but contrasts with the positive response of L commonly predicted by many ecosystem models.
DOI: 10.1111/gcb.13151
PubMed: 26546378
Affiliations:
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Duursma</name><affiliation wicri:level="1"><nlm:affiliation>Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, Australia.</nlm:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW</wicri:regionArea><wicri:noRegion>NSW</wicri:noRegion></affiliation></author><author><name sortKey="Gimeno, Teresa E" sort="Gimeno, Teresa E" uniqKey="Gimeno T" first="Teresa E" last="Gimeno">Teresa E. Gimeno</name><affiliation wicri:level="1"><nlm:affiliation>Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, Australia.</nlm:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW</wicri:regionArea><wicri:noRegion>NSW</wicri:noRegion></affiliation></author><author><name sortKey="Boer, Matthias M" sort="Boer, Matthias M" uniqKey="Boer M" first="Matthias M" last="Boer">Matthias M. 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Ellsworth</name><affiliation wicri:level="1"><nlm:affiliation>Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, Australia.</nlm:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW</wicri:regionArea><wicri:noRegion>NSW</wicri:noRegion></affiliation></author></analytic><series><title level="j">Global change biology</title><idno type="eISSN">1365-2486</idno><imprint><date when="2016" type="published">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Atmosphere</term><term>Carbon Dioxide (analysis)</term><term>Eucalyptus (growth & development)</term><term>Forests</term><term>New South Wales</term><term>Plant Leaves (growth & development)</term><term>Water (analysis)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Atmosphère</term><term>Dioxyde de carbone (analyse)</term><term>Eau (analyse)</term><term>Eucalyptus (croissance et développement)</term><term>Feuilles de plante (croissance et développement)</term><term>Forêts</term><term>Nouvelle-Galles du Sud</term></keywords><keywords scheme="MESH" type="chemical" qualifier="analysis" xml:lang="en"><term>Carbon Dioxide</term><term>Water</term></keywords><keywords scheme="MESH" qualifier="analyse" xml:lang="fr"><term>Dioxyde de carbone</term><term>Eau</term></keywords><keywords scheme="MESH" qualifier="croissance et développement" xml:lang="fr"><term>Eucalyptus</term><term>Feuilles de plante</term></keywords><keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Eucalyptus</term><term>Plant Leaves</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Atmosphere</term><term>Forests</term><term>New South Wales</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Atmosphère</term><term>Forêts</term><term>Nouvelle-Galles du Sud</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Canopy leaf area, quantified by the leaf area index (L), is a crucial driver of forest productivity, water use and energy balance. Because L responds to environmental drivers, it can represent an important feedback to climate change, but its responses to rising atmospheric [CO2] and water availability of forests have been poorly quantified. We studied canopy leaf area dynamics for 28 months in a native evergreen Eucalyptus woodland exposed to free-air CO2 enrichment (the EucFACE experiment), in a subtropical climate where water limitation is common. We hypothesized that, because of expected stimulation of productivity and water-use efficiency, L should increase with elevated [CO2]. We estimated L from diffuse canopy transmittance, and measured monthly leaf litter production. Contrary to expectation, L did not respond to elevated [CO2]. We found that L varied between 1.10 and 2.20 across the study period. The dynamics of L showed a quick increase after heavy rainfall and a steady decrease during periods of low rainfall. Leaf litter production was correlated to changes in L, both during periods of decreasing L (when no leaf growth occurred) and during periods of increasing L (active shedding of old foliage when new leaf growth occurred). Leaf lifespan, estimated from mean L and total annual litter production, was up to 2 months longer under elevated [CO2] (1.18 vs. 1.01 years; P = 0.05). Our main finding that L was not responsive to elevated CO2 is consistent with other forest FACE studies, but contrasts with the positive response of L commonly predicted by many ecosystem models.</div></front></TEI><affiliations><list><country><li>Australie</li></country></list><tree><country name="Australie"><noRegion><name sortKey="Duursma, Remko A" sort="Duursma, Remko A" uniqKey="Duursma R" first="Remko A" last="Duursma">Remko A. Duursma</name></noRegion><name sortKey="Boer, Matthias M" sort="Boer, Matthias M" uniqKey="Boer M" first="Matthias M" last="Boer">Matthias M. Boer</name><name sortKey="Crous, Kristine Y" sort="Crous, Kristine Y" uniqKey="Crous K" first="Kristine Y" last="Crous">Kristine Y. Crous</name><name sortKey="Ellsworth, David S" sort="Ellsworth, David S" uniqKey="Ellsworth D" first="David S" last="Ellsworth">David S. Ellsworth</name><name sortKey="Gimeno, Teresa E" sort="Gimeno, Teresa E" uniqKey="Gimeno T" first="Teresa E" last="Gimeno">Teresa E. Gimeno</name><name sortKey="Tjoelker, Mark G" sort="Tjoelker, Mark G" uniqKey="Tjoelker M" first="Mark G" last="Tjoelker">Mark G. Tjoelker</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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