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Canopy leaf area of a mature evergreen Eucalyptus woodland does not respond to elevated atmospheric [CO2] but tracks water availability

hal.structure.identifierHawkesbury Institute for the Environment
dc.contributor.authorDUURSMA, Remko A.
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
hal.structure.identifierHawkesbury Institute for the Environment
dc.contributor.authorGIMENO, Teresa
hal.structure.identifierHawkesbury Institute for the Environment
dc.contributor.authorBOER, Matthias M.
hal.structure.identifierHawkesbury Institute for the Environment
dc.contributor.authorCROUS, Kristine Y.
hal.structure.identifierHawkesbury Institute for the Environment
dc.contributor.authorTJOELKER, Mark G.
hal.structure.identifierHawkesbury Institute for the Environment
dc.contributor.authorELLSWORTH, David S.
dc.date.accessioned2024-04-08T12:01:57Z
dc.date.available2024-04-08T12:01:57Z
dc.date.issued2016
dc.identifier.issn1354-1013
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196180
dc.description.abstractEnCanopy 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.
dc.language.isoen
dc.publisherWiley
dc.subjectphenology
dc.subject.endrought
dc.subject.enfree-air CO2 enrichment
dc.subject.enleaf area index
dc.subject.enlitter production
dc.title.enCanopy leaf area of a mature evergreen Eucalyptus woodland does not respond to elevated atmospheric [CO2] but tracks water availability
dc.typeArticle de revue
dc.identifier.doi10.1111/gcb.13151
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences de l'environnement
bordeaux.journalGlobal Change Biology
bordeaux.page1666-1676
bordeaux.volume22
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue4
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-02637671
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02637671v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Global%20Change%20Biology&rft.date=2016&rft.volume=22&rft.issue=4&rft.spage=1666-1676&rft.epage=1666-1676&rft.eissn=1354-1013&rft.issn=1354-1013&rft.au=DUURSMA,%20Remko%20A.&GIMENO,%20Teresa&BOER,%20Matthias%20M.&CROUS,%20Kristine%20Y.&TJOELKER,%20Mark%20G.&rft.genre=article


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