Using δ13C and δ18O to analyze loblolly pine (Pinus taeda L.) response to experimental drought and fertilization

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dc.contributor.authorLin, Wenen
dc.contributor.authorDomec, Jean-Christopheen
dc.contributor.authorWard, Eric J.en
dc.contributor.authorMarshall, Johnen
dc.contributor.authorKin, John S.en
dc.contributor.authorLaviner, Marshall A.en
dc.contributor.authorFox, Thomas R.en
dc.contributor.authorWest, Jason B.en
dc.contributor.authorSun, Geen
dc.contributor.authorMcNulty, Steve G.en
dc.contributor.authorNoormets, Askoen
dc.contributor.departmentForest Resources and Environmental Conservationen
dc.date.accessioned2020-06-12T14:45:27Zen
dc.date.available2020-06-12T14:45:27Zen
dc.date.issued2019-12en
dc.description.abstractDrought frequency and intensity are projected to increase throughout the southeastern USA, the natural range of loblolly pine (Pinus taeda L.), and are expected to have major ecological and economic implications. We analyzed the carbon and oxygen isotopic compositions in tree ring cellulose of loblolly pine in a factorial drought (similar to 30% throughfall reduction) and fertilization experiment, supplemented with trunk sap flow, allometry and microclimate data. We then simulated leaf temperature and applied a multi-dimensional sensitivity analysis to interpret the changes in the oxygen isotope data. This analysis found that the observed changes in tree ring cellulose could only be accounted for by inferring a change in the isotopic composition of the source water, indicating that the drought treatment increased the uptake of stored moisture from earlier precipitation events. The drought treatment also increased intrinsic water-use efficiency, but had no effect on growth, indicating that photosynthesis remained relatively unaffected despite 19% decrease in canopy conductance. In contrast, fertilization increased growth, but had no effect on the isotopic composition of tree ring cellulose, indicating that the fertilizer gains in biomass were attributable to greater leaf area and not to changes in leaf-level gas exchange. The multi-dimensional sensitivity analysis explored model behavior under different scenarios, highlighting the importance of explicit consideration of leaf temperature in the oxygen isotope discrimination (Delta O-18(c)) simulation and is expected to expand the inference space of the Delta O-18(c) models for plant ecophysiological studies.en
dc.description.adminPublic domain – authored by a U.S. government employeeen
dc.description.notesThis research was funded by The Pine Integrated Network: Education, Mitigation, and Adaptation project (PINEMAP), a Coordinated Agricultural Project (USDA National Institute of Food and Agriculture award 2011-68002-30185), the National Science Foundation (NSF-EAR-1344703 and NSF-IOS-1754893 to J.-C.D.) and the French Agence Nationale de la recherche (ANR-17-ASIE-0007-02 and ANR-18-PRIM-0006-09 to J.-C.D.).en
dc.description.sponsorshipPine Integrated Network: Education, Mitigation, and Adaptation project (PINEMAP); Coordinated Agricultural Project (USDA National Institute of Food and Agriculture award) [2011-68002-30185]; National Science Foundation (NSF)National Science Foundation (NSF) [EAR-1344703, IOS-1754893]; French Agence Nationale de la rechercheFrench National Research Agency (ANR) [ANR-17-ASIE-0007-02, ANR-18-PRIM-0006-09]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1093/treephys/tpz096en
dc.identifier.eissn1758-4469en
dc.identifier.issn0829-318Xen
dc.identifier.issue12en
dc.identifier.pmid31748787en
dc.identifier.urihttp://hdl.handle.net/10919/98829en
dc.identifier.volume39en
dc.language.isoenen
dc.rightsCreative Commons CC0 1.0 Universal Public Domain Dedicationen
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/en
dc.subjectalpha-celluloseen
dc.subjectcarbon isotope discriminationen
dc.subjectiWUEen
dc.subjectDelta C-13en
dc.subjectDelta O-18en
dc.titleUsing δ13C and δ18O to analyze loblolly pine (Pinus taeda L.) response to experimental drought and fertilizationen
dc.title.alternativeUsing delta C-13 and delta O-18 to analyze loblolly pine (Pinus taeda L.) response to experimental drought and fertilizationen
dc.title.serialTree Physiologyen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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