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Linking carbon and water relations to drought-induced mortality in Pinus flexilis seedlings

hal.structure.identifierIdaho State University
dc.contributor.authorREINHARDT, Keith
hal.structure.identifierUnited States Geological Survey [USGS]
dc.contributor.authorGERMINO, Matthew J.
hal.structure.identifierUniversity of California [Merced] [UC Merced]
dc.contributor.authorKUEPPERS, Lara M.
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorDOMEC, Jean-Christophe
hal.structure.identifierUniversity of Colorado [Boulder]
dc.contributor.authorMITTON, Jeffry
dc.date.accessioned2024-04-08T12:02:47Z
dc.date.available2024-04-08T12:02:47Z
dc.date.issued2015
dc.identifier.issn0829-318X
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196226
dc.description.abstractEnSurvival of tree seedlings at high elevations has been shown to be limited by thermal constraints on carbon balance, but it is unknown if carbon relations also limit seedling survival at lower elevations, where water relations may be more important. We measured and modeled carbon fluxes and water relations in first-year Pinus flexilis seedlings in garden plots just beyond the warm edge of their natural range, and compared these with dry-mass gain and survival across two summers. We hypothesized that mortality in these seedlings would be associated with declines in water relations, more so than with carbon-balance limitations. Rather than gradual declines in survivorship across growing seasons, we observed sharp, large-scale mortality episodes that occurred once volumetric soil-moisture content dropped below 10%. By this point, seedling water potentials had decreased below -5 MPa, seedling hydraulic conductivity had decreased by 90% and seedling hydraulic resistance had increased by >900%. Additionally, non-structural carbohydrates accumulated in aboveground tissues at the end of both summers, suggesting impairments in phloem-transport from needles to roots. This resulted in low carbohydrate concentrations in roots, which likely impaired root growth and water uptake at the time of critically low soil moisture. While photosynthesis and respiration on a leaf area basis remained high until critical hydraulic thresholds were exceeded, modeled seedling gross primary productivity declined steadily throughout the summers. At the time of mortality, modeled productivity was insufficient to support seedling biomassgain rates, metabolism and secondary costs. Thus the large-scale mortality events that we observed near the end of each summer were most directly linked with acute, episodic declines in plant hydraulic function that were linked with important changes in whole-seedling carbon relations.
dc.language.isoen
dc.publisherOxford University Press (OUP)
dc.subject.encarbon balance
dc.subject.enhydraulic resistance
dc.subject.ennon-structural carbohydrates
dc.subject.enproductivity
dc.subject.enrespiration
dc.title.enLinking carbon and water relations to drought-induced mortality in Pinus flexilis seedlings
dc.typeArticle de revue
dc.identifier.doi10.1093/treephys/tpv045
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences de l'environnement
bordeaux.journalTree Physiology
bordeaux.page771-782
bordeaux.volume35
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue7
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-02633800
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02633800v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Tree%20Physiology&rft.date=2015&rft.volume=35&rft.issue=7&rft.spage=771-782&rft.epage=771-782&rft.eissn=0829-318X&rft.issn=0829-318X&rft.au=REINHARDT,%20Keith&GERMINO,%20Matthew%20J.&KUEPPERS,%20Lara%20M.&DOMEC,%20Jean-Christophe&MITTON,%20Jeffry&rft.genre=article


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