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Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest

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dc.creatorVerryckt, Lore T.spa
dc.creatorVan Langenhove, Leandrospa
dc.creatorCiais, Philippespa
dc.creatorCourtois, Elodie A.spa
dc.creatorVicca, Saraspa
dc.creatorPeñuelas, Josepspa
dc.creatorStahl, Clémentspa
dc.creatorCoste, Sabrinaspa
dc.creatorEllsworth, David S.spa
dc.creatorPosada Hostettler, Juan Manuel Robertospa
dc.creatorObersteiner, Michaelspa
dc.creatorChave, Jérômespa
dc.creatorJanssens, Ivan A.spa
dc.date.accessioned2020-05-26T00:03:03Z
dc.date.available2020-05-26T00:03:03Z
dc.date.created2020spa
dc.description.abstractMeasuring leaf gas exchange from canopy leaves is fundamental for our understanding of photosynthesis and for a realistic representation of carbon uptake in vegetation models. Since canopy leaves are often difficult to reach, especially in tropical forests with emergent trees up to 60 m at remote places, canopy access techniques such as canopy cranes or towers have facilitated photosynthetic measurements. These structures are expensive and therefore not very common. As an alternative, branches are often cut to enable leaf gas exchange measurements. The effect of branch excision on leaf gas exchange rates should be minimized and quantified to evaluate possible bias. We compared light-saturated leaf net photosynthetic rates measured on excised and intact branches. We selected branches positioned at three canopy positions, estimated relative to the top of the canopy: upper sunlit foliage, middle canopy foliage, and lower canopy foliage. We studied the variation of the effects of branch excision and transport among branches at these different heights in the canopy. After excision and transport, light-saturated leaf net photosynthetic rates were close to zero for most leaves due to stomatal closure. However, when the branch had acclimated to its new environmental conditions—which took on average 20 min—light-saturated leaf net photosynthetic rates did not significantly differ between the excised and intact branches. We therefore conclude that branch excision does not affect the measurement of light-saturated leaf net photosynthesis, provided that the branch is recut under water and is allowed sufficient time to acclimate to its new environmental conditions. © 2020 The Association for Tropical Biology and Conservationeng
dc.format.mimetypeapplication/pdf
dc.identifier.doihttps://doi.org/10.1111/btp.12774
dc.identifier.issn63606
dc.identifier.urihttps://repository.urosario.edu.co/handle/10336/23556
dc.language.isoengspa
dc.publisherBlackwell Publishing Ltdspa
dc.relation.citationTitleBiotropica
dc.relation.ispartofBiotropica, ISSN:63606,(2020)spa
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85080877931&doi=10.1111%2fbtp.12774&partnerID=40&md5=320f1f3d53ab87f860c959cbd0c0a42espa
dc.rights.accesRightsinfo:eu-repo/semantics/openAccess
dc.rights.accesoAbierto (Texto Completo)spa
dc.source.instnameinstname:Universidad del Rosariospa
dc.source.reponamereponame:Repositorio Institucional EdocURspa
dc.subject.keywordBranch cuttingspa
dc.subject.keywordCanopy physiologyspa
dc.subject.keywordFrench guianaspa
dc.subject.keywordGas exchangespa
dc.subject.keywordPhotosynthesisspa
dc.subject.keywordRainforestspa
dc.subject.keywordStomatal conductancespa
dc.titleCoping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forestspa
dc.typearticleeng
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersion
dc.type.spaArtículospa
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