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Micro-CT measurements of within-ring variability in the longitudinal hydraulic pathways in Norway spruce

Adey-Johnson, Robin, Mclean, J Paul, Van den Bulcke, Jan, Van Acker, Joris and McDonald, Peter J. (2019) Micro-CT measurements of within-ring variability in the longitudinal hydraulic pathways in Norway spruce IAWA JOURNAL.

IAWA_NanoCTPaper_June19_clean.pdf - Accepted version Manuscript

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This study aimed to define the variability in the microstructure of Norway spruce within an annual ring by examining differences between earlywood and latewood. In particular we were interested in obtaining new information on bordered pit occurrence and locations relative to tracheid ends, plus the lumina dimensions and longitudinal overlap of tracheids that collectively define the longitudinal hydraulic pathways. A stacked series of X-ray micro-CT scans of an annual ring of Norway spruce were made and stitched together longitudinally to form a three-dimensional volume. The imaging resolution was carefully chosen to capture both longitudinal and transverse anatomical details. Measurements of tracheid length; overlap; radial lumen diameter and bordered pit location were made semi-automatically using image analysis. The distribution of radial lumen diameter was used to define earlywood and latewood. Then bordered pit linear density and spatial distribution, tracheid length and overlap were analysed, presented and contrasted for earlywood and latewood. Further differences between earlywood and latewood were found only in bordered pit linear density.

Clear trends in radial lumen diameter and pit linear density were observed with radial position within the growth ring. These results provide new information on the variability of the Norway spruce microstructure within an annual ring.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Mclean, J Paul
Van den Bulcke, Jan
Van Acker, Joris
McDonald, Peter
Date : 10 October 2019
Funders : EPSRC - Engineering and Physical Sciences Research Council, Forest Research and Scottish Forestry, Transnational Access to Research Infrastructures
DOI : 10.1163/22941932-00002104
Copyright Disclaimer : Copyright © 2019 Brill Academic Publishers
Uncontrolled Keywords : Picea abies; Microstructure; X-ray CT; Micro-CT; Variability; Pits
Additional Information : This work was carried out as part of an Engineering Doctorate in Micro- and Nanomaterials and Technologies at the University of Surrey, funded by EPSRC (grant number 1364515), Forest Research and Scottish Forestry (previously called Forestry Commission Scotland). Further financial support was provided by the Transnational Access to Research Infrastructures activity in the Seventh Framework Programme of the European Union under 431 the Trees4Future project (no. 284181).
Depositing User : Diane Maxfield
Date Deposited : 27 Aug 2019 10:28
Last Modified : 11 Oct 2020 02:08

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