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dc.contributor.authorGebauer, Roman
dc.contributor.authorVolařík, Daniel
dc.contributor.authorUrban, Josef
dc.contributor.authorBørja, Isabella
dc.contributor.authorNagy, Nina Elisabeth
dc.contributor.authorEldhuset, Toril Drabløs
dc.contributor.authorKrokene, Paal
dc.identifier.citationiForest : Biogeosciences and Forestry. 2019, 12 27-34.nb_NO
dc.description.abstractSeveral studies have looked at how individual environmental factors influence needle morphology in conifer trees, but interacting effects between drought and canopy position have received little attention. In this study, we characterized morphological responses to experimentally induced drought stress in sun exposed and shaded current-year Norway spruce needles. In the drought plot trees were suffering mild drought stress, with an average soil water potential at 50 cm depth of -0.4 MPa. In general, morphological needle traits had greater values in sun needles in the upper canopy than in shaded needles in the lower canopy. Needle morphology 15 months after the onset of drought was determined by canopy position, as only sun needle morphology was affected by drought. Thus, canopy position was a stronger morphogenic factor determining needle structure than was water availability. The largest influence of mild drought was observed for needle length, projected needle area and total needle area, which all were reduced by ~27% relative to control trees. Needle thickness and needle width showed contrasting sensitivity to drought, as drought only affected needle thickness (10% reduction). Needle dry mass, leaf mass per area and needle density were not affected 15 months after the onset of mild drought. Our results highlight the importance of considering canopy position as well as water availability when comparing needle structure or function between conifer species. More knowledge about how different canopy parts of Norway spruce adapt to drought is important to understand forest productivity under changing environmental conditions.nb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.subjectCanopy Positionnb_NO
dc.subjectCrown Light Gradientnb_NO
dc.subjectNeedle Structurenb_NO
dc.subjectPicea abiesnb_NO
dc.titleEffects of mild drought on the morphology of sun and shade needles in 20-year-old Norway spruce treesnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.rights.holder© SISEF - The Italian Society of Silviculture and Forest Ecology 2019nb_NO
dc.subject.nsiVDP::Landbruks- og Fiskerifag: 900nb_NO
dc.source.journaliForest : Biogeosciences and Forestrynb_NO
dc.relation.projectAndre: CZ.1.07/2.3.00/20.0265 - European Social Fund og Tsjekkianb_NO
dc.relation.projectEØS - Det europeiske økonomiske samarbeidsområde: A/CZ0046/2/0009nb_NO
dc.relation.projectAndre: INTER-TRANSFER LTT17033 - Tsjekkianb_NO
dc.relation.projectAndre: IGA 73/2013 - Mendel University in Brnonb_NO
dc.relation.projectAndre: CZ.1.07/2.3.00/20.0265 - EUROPEAN SOCIAL FUND OG TSJEKKIAnb_NO
dc.relation.projectAndre: INTER-TRANSFER LTT17033 - TSJEKKIAnb_NO
dc.relation.projectAndre: IGA 73/2013 - MENDEL UNIVERSITY IN BRNOnb_NO
cristin.unitnameDivisjon for bioteknologi og plantehelse
cristin.unitnameDivisjon for miljø og naturressurser

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal