K. M. Bhat 
,
Matti Kärkkäinen
Bhat K. M., Kärkkäinen M. (1981). . Silva Fennica vol. 15 no. 1 article id 5095. https://doi.org/10.14214/sf.a15036
English title: Variation in structure and selected properties of Finnish birch wood. III.Abstract
Variation of cellular proportion within the same growth rings counted from the pith of the stems and branches in four trees of Betula pendula Roth was studied. The fibre percentage decreased from breast height to the crown and then increased in the branches. The reverse trend was found in the percentage of vessels and parenchyma, although the latter varied relatively little. No statistically significant differences were found in the percentages of fibres, vessels and rays within the same growth rings counted from the pith between the stems and branches. In both the stem and the branches, the proportion of fibres increased and that of vessels and rays decreased from the pith to the surface. Even crown formed wood differed from that of stem formed.
The PDF includes a summary in Finnish.
Keywords
Betula pendula;
silver birch;
branches;
wood anatomy;
parenchyma;
stem;
vessels;
fibers
Published in 1981
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