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

dc.contributor.authorDUURSMA, Remko A.
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorGIMENO, Teresa
dc.contributor.authorBOER, Matthias M.
dc.contributor.authorCROUS, Kristine Y.
dc.contributor.authorTJOELKER, Mark G.
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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