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Effects of mild drought on the morphology of sun and shade needles in 20-year-old Norway spruce trees

Roman Gebauer (1)   , Daniel Volarík (1), Josef Urban (1-2), Isabella Børja (3), Nina Elisabeth Nagy (3), Toril Drabløs Eldhuset (3), Paal Krokene (3)

iForest - Biogeosciences and Forestry, Volume 12, Issue 1, Pages 27-34 (2019)
doi: https://doi.org/10.3832/ifor2809-011
Published: Jan 10, 2019 - Copyright © 2019 SISEF

Research Articles


Several 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.

  Keywords


Canopy Position, Drought, Crown Light Gradient, Needle Structure, Picea abies, Transpiration

Authors’ address

(1)
Roman Gebauer
Daniel Volarík
Josef Urban
Department of Forest Botany, Dendrology and Geobiocoenology, Mendel University in Brno, Zemedelská 3, 61300 Brno (Czech Republic)
(2)
Josef Urban
Siberian Federal University, Krasnoyarsk (Russia)
(3)
Isabella Børja
Nina Elisabeth Nagy
Toril Drabløs Eldhuset
Paal Krokene
Norwegian Institute of Bioeconomy Research, PO Box 115, N-1431 Ås (Norway)

Corresponding author

 
Roman Gebauer
gebo@email.cz

Citation

Gebauer R, Volarík D, Urban J, Børja I, Nagy NE, Eldhuset TD, Krokene P (2019). Effects of mild drought on the morphology of sun and shade needles in 20-year-old Norway spruce trees. iForest 12: 27-34. - doi: 10.3832/ifor2809-011

Academic Editor

Tamir Klein

Paper history

Received: Apr 10, 2018
Accepted: Oct 30, 2018

First online: Jan 10, 2019
Publication Date: Feb 28, 2019
Publication Time: 2.40 months

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