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Explicitly accounting for needle sugar pool size crucial for predicting intra‐seasonal dynamics of needle carbohydrates δ <sup>18</sup> O and δ <sup>13</sup> C

hal.structure.identifierNatural Resources Institute Finland [LUKE]
dc.contributor.authorLEPPÄ, Kersti
hal.structure.identifierNatural Resources Institute Finland [LUKE]
hal.structure.identifierHelsingin yliopisto = Helsingfors universitet = University of Helsinki
dc.contributor.authorTANG, Yu
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorOGÉE, Jérôme
hal.structure.identifierNatural Resources Institute Finland [LUKE]
dc.contributor.authorLAUNIAINEN, Samuli
hal.structure.identifierUniversité de Bâle = University of Basel = Basel Universität [Unibas]
dc.contributor.authorKAHMEN, Ansgar
hal.structure.identifierHelsingin yliopisto = Helsingfors universitet = University of Helsinki
dc.contributor.authorKOLARI, Pasi
hal.structure.identifierNatural Resources Institute Finland [LUKE]
dc.contributor.authorSAHLSTEDT, Elina
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
dc.contributor.authorSAURER, Matthias
hal.structure.identifierHelsingin yliopisto = Helsingfors universitet = University of Helsinki
dc.contributor.authorSCHIESTL‐AALTO, Pauliina
hal.structure.identifierNatural Resources Institute Finland [LUKE]
dc.contributor.authorRINNE‐GARMSTON, Katja
dc.date.accessioned2024-04-08T11:43:48Z
dc.date.available2024-04-08T11:43:48Z
dc.date.issued2022-06-24
dc.identifier.issn0028-646X
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195123
dc.description.abstractEnWe explore needle sugar isotopic compositions (δ 18 O and δ 13 C) in boreal Scots pine (Pinus sylvestris) over two growing seasons. A leaf-level dynamic model driven by environmental conditions and based on current understanding of isotope fractionation processes was built to predict δ 18 O and δ 13 C of two hierarchical needle carbohydrate pools, accounting for the needle sugar pool size and the presence of an invariant pinitol pool. Model results agreed well with observed needle water δ 18 O, δ 18 O and δ 13 C of needle water-soluble carbohydrates (sugars + pinitol), and needle sugar δ 13 C (R 2 = 0.95, 0.84, 0.60, 0.73, respectively). Relative humidity (RH) and intercellular to ambient CO 2 concentration ratio (C i /C a) were the dominant drivers of δ 18 O and δ 13 C variability, respectively. However, the variability of needle sugar δ 18 O and δ 13 C was reduced on diel and intra-seasonal timescales, compared to predictions based on instantaneous RH and C i /C a , due to the large needle sugar pool, which caused the signal formation period to vary seasonally from 2 d to more than 5 d. Furthermore, accounting for a temperature-sensitive biochemical 18 Ofractionation factor and mesophyll resistance in 13 C-discrimination were critical. Interpreting leaf-level isotopic signals requires understanding on time integration caused by mixing in the needle sugar pool.
dc.language.isoen
dc.publisherWiley
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.subject.endynamic modeling
dc.subject.enneedle sugar
dc.subject.enoxygen isotope
dc.subject.enphotosynthesis
dc.subject.enScots pine (Pinus sylvestris)
dc.subject.enboreal forest
dc.subject.encarbon isotope
dc.title.enExplicitly accounting for needle sugar pool size crucial for predicting intra‐seasonal dynamics of needle carbohydrates δ <sup>18</sup> O and δ <sup>13</sup> C
dc.typeArticle de revue
dc.identifier.doi10.1111/nph.18227
dc.subject.halSciences de l'environnement
bordeaux.journalNew Phytologist
bordeaux.page2044 - 2060
bordeaux.volume236
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue6
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-04115056
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04115056v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=New%20Phytologist&amp;rft.date=2022-06-24&amp;rft.volume=236&amp;rft.issue=6&amp;rft.spage=2044%20-%202060&amp;rft.epage=2044%20-%202060&amp;rft.eissn=0028-646X&amp;rft.issn=0028-646X&amp;rft.au=LEPP%C3%84,%20Kersti&amp;TANG,%20Yu&amp;OG%C3%89E,%20J%C3%A9r%C3%B4me&amp;LAUNIAINEN,%20Samuli&amp;KAHMEN,%20Ansgar&amp;rft.genre=article


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