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

Measuring 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 pl...

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Autores:
Tipo de recurso:
Fecha de publicación:
2020
Institución:
Universidad del Rosario
Repositorio:
Repositorio EdocUR - U. Rosario
Idioma:
eng
OAI Identifier:
oai:repository.urosario.edu.co:10336/23556
Acceso en línea:
https://doi.org/10.1111/btp.12774
https://repository.urosario.edu.co/handle/10336/23556
Palabra clave:
Branch cutting
Canopy physiology
French guiana
Gas exchange
Photosynthesis
Rainforest
Stomatal conductance
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repository_id_str
spelling 99497a26-0fd4-493e-973a-7ee15cef7b62e8fad9cf-e417-46e0-b738-f8dfc1cf06e009f550be-aff2-49d1-adf3-02569f93bb7012f9eb4b-d598-47af-8b3a-a1064c586ab3411628a1-b723-44db-8ddb-69f0ba5ca4b2dd5c24fb-bd0e-407c-b3be-c6ec498197500fd69fc2-3ba3-43ac-9f5e-96f84afc956fd62ca833-d95f-4910-a242-f7f65af5e97f4691628c-fa01-4ffc-8264-720df0b54a9e804161776007e8232d1-47a6-4731-b3eb-7b71bddc700a5ecd7311-837c-4229-9877-6ab28692dccd9829ab92-2627-4033-af58-476d187039eb2020-05-26T00:03:03Z2020-05-26T00:03:03Z2020Measuring 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 Conservationapplication/pdfhttps://doi.org/10.1111/btp.1277463606https://repository.urosario.edu.co/handle/10336/23556engBlackwell Publishing LtdBiotropicaBiotropica, ISSN:63606,(2020)https://www.scopus.com/inward/record.uri?eid=2-s2.0-85080877931&doi=10.1111%2fbtp.12774&partnerID=40&md5=320f1f3d53ab87f860c959cbd0c0a42eAbierto (Texto Completo)http://purl.org/coar/access_right/c_abf2instname:Universidad del Rosarioreponame:Repositorio Institucional EdocURBranch cuttingCanopy physiologyFrench guianaGas exchangePhotosynthesisRainforestStomatal conductanceCoping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forestarticleArtículohttp://purl.org/coar/version/c_970fb48d4fbd8a85http://purl.org/coar/resource_type/c_6501Verryckt, Lore T.Van Langenhove, LeandroCiais, PhilippeCourtois, Elodie A.Vicca, SaraPeñuelas, JosepStahl, ClémentCoste, SabrinaEllsworth, David S.Posada Hostettler, Juan Manuel RobertoObersteiner, MichaelChave, JérômeJanssens, Ivan A.10336/23556oai:repository.urosario.edu.co:10336/235562022-05-02 07:37:16.266412https://repository.urosario.edu.coRepositorio institucional EdocURedocur@urosario.edu.co
dc.title.spa.fl_str_mv Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest
title Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest
spellingShingle Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest
Branch cutting
Canopy physiology
French guiana
Gas exchange
Photosynthesis
Rainforest
Stomatal conductance
title_short Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest
title_full Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest
title_fullStr Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest
title_full_unstemmed Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest
title_sort Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest
dc.subject.keyword.spa.fl_str_mv Branch cutting
Canopy physiology
French guiana
Gas exchange
Photosynthesis
Rainforest
Stomatal conductance
topic Branch cutting
Canopy physiology
French guiana
Gas exchange
Photosynthesis
Rainforest
Stomatal conductance
description Measuring 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 Conservation
publishDate 2020
dc.date.accessioned.none.fl_str_mv 2020-05-26T00:03:03Z
dc.date.available.none.fl_str_mv 2020-05-26T00:03:03Z
dc.date.created.spa.fl_str_mv 2020
dc.type.eng.fl_str_mv article
dc.type.coarversion.fl_str_mv http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.coar.fl_str_mv http://purl.org/coar/resource_type/c_6501
dc.type.spa.spa.fl_str_mv Artículo
dc.identifier.doi.none.fl_str_mv https://doi.org/10.1111/btp.12774
dc.identifier.issn.none.fl_str_mv 63606
dc.identifier.uri.none.fl_str_mv https://repository.urosario.edu.co/handle/10336/23556
url https://doi.org/10.1111/btp.12774
https://repository.urosario.edu.co/handle/10336/23556
identifier_str_mv 63606
dc.language.iso.spa.fl_str_mv eng
language eng
dc.relation.citationTitle.none.fl_str_mv Biotropica
dc.relation.ispartof.spa.fl_str_mv Biotropica, ISSN:63606,(2020)
dc.relation.uri.spa.fl_str_mv https://www.scopus.com/inward/record.uri?eid=2-s2.0-85080877931&doi=10.1111%2fbtp.12774&partnerID=40&md5=320f1f3d53ab87f860c959cbd0c0a42e
dc.rights.coar.fl_str_mv http://purl.org/coar/access_right/c_abf2
dc.rights.acceso.spa.fl_str_mv Abierto (Texto Completo)
rights_invalid_str_mv Abierto (Texto Completo)
http://purl.org/coar/access_right/c_abf2
dc.format.mimetype.none.fl_str_mv application/pdf
dc.publisher.spa.fl_str_mv Blackwell Publishing Ltd
institution Universidad del Rosario
dc.source.instname.spa.fl_str_mv instname:Universidad del Rosario
dc.source.reponame.spa.fl_str_mv reponame:Repositorio Institucional EdocUR
repository.name.fl_str_mv Repositorio institucional EdocUR
repository.mail.fl_str_mv edocur@urosario.edu.co
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